Beer goes flatter, then versus now

245 capital cities · 1976-1986 <> 2015-2025

Across 245 capital cities with a complete daily weather record going back to 1976, beer on average goes flat faster than it used to: the hottest month's average daily high now runs 23.4°C, against 22.1°C in 1976 to 1986, a typical capital's beer fizz-loss index of 53.4 out of 100. In 243 of those capitals the hottest month has warmed, and in 2 it has cooled, so this is not a single global trend but a redistribution. Note: this measures the change against that same capital's own past, not where beer goes flat fastest today in absolute terms. The increase is nowhere bigger than in Chișinău, where the hottest month is up 2.9°C to 16.6°C, a fizz-loss index of 58 out of 100. New Delhi's hottest month cooled the most, to 30.4°C, but simply being that much hotter still means beer there goes flat faster than in Chișinău.

The four capitals with the biggest increase since 1976-1986, and the four with the biggest decrease, where beer's flattening has slowed the most compared with its own past.

Data through September 3, 2026.

The intro of our climate and meteo pages

The percentage next to each capital is its fizz-loss index, the same 0-100 number shown on the dashboard card (50 = unchanged from its own early window) — see "Why does beer go flat faster in warmer weather?" above. The "≈ min" beside it is an illustrative estimate of time to noticeably flat, not a measured rate — see "Does this predict exactly how fast my own beer goes flat?" in the FAQ below for the assumption behind it.

Every other capital, ranked by how much its hottest month's average high has changed, from the biggest warming to the biggest cooling, comparing 1976-1986 with 2015-2025.
Rank	Capital	Then and now	Change
1	YerevanArmenia	Then15 °CNow17.6 °C	+2.6 °C57.2% · ≈ 23 minflattens faster than before
2	DenverColorado	Then15.5 °CNow18 °C	+2.5 °C56.9% · ≈ 23 minflattens faster than before
3	JubaSouth Sudan	Then31.5 °CNow34 °C	+2.5 °C56.2% · ≈ 23 minflattens faster than before
4	VilniusLithuania	Then9.2 °CNow11.7 °C	+2.5 °C57.2% · ≈ 23 minflattens faster than before
5	WarsawPoland	Then11.2 °CNow13.7 °C	+2.5 °C57.1% · ≈ 23 minflattens faster than before
6	BerlinGermany	Then12.3 °CNow14.7 °C	+2.4 °C56.8% · ≈ 23 minflattens faster than before
7	LjubljanaSlovenia	Then13.2 °CNow15.6 °C	+2.4 °C56.7% · ≈ 23 minflattens faster than before
8	MoscowRussia	Then7.4 °CNow9.8 °C	+2.4 °C57% · ≈ 23 minflattens faster than before
9	RigaLatvia	Then8.8 °CNow11.2 °C	+2.4 °C56.9% · ≈ 23 minflattens faster than before
10	UlaanbaatarMongolia	Then4.7 °CNow7.1 °C	+2.4 °C57.1% · ≈ 23 minflattens faster than before
11	ViennaAustria	Then13.6 °CNow16 °C	+2.4 °C56.7% · ≈ 23 minflattens faster than before
12	AshgabatTurkmenistan	Then21.1 °CNow23.4 °C	+2.3 °C56.1% · ≈ 23 minflattens faster than before
13	BelgradeSerbia	Then15.8 °CNow18.1 °C	+2.3 °C56.3% · ≈ 23 minflattens faster than before
14	BernSwitzerland	Then12 °CNow14.3 °C	+2.3 °C56.5% · ≈ 23 minflattens faster than before
15	BudapestHungary	Then14.2 °CNow16.5 °C	+2.3 °C56.4% · ≈ 23 minflattens faster than before
16	HelsinkiFinland	Then7.1 °CNow9.4 °C	+2.3 °C56.7% · ≈ 23 minflattens faster than before
17	OsloNorway	Then8.3 °CNow10.6 °C	+2.3 °C56.7% · ≈ 23 minflattens faster than before
18	PragueCzech Republic	Then12.5 °CNow14.8 °C	+2.3 °C56.5% · ≈ 23 minflattens faster than before
19	TehranIran	Then19.6 °CNow21.9 °C	+2.3 °C56.2% · ≈ 23 minflattens faster than before
20	BratislavaSlovakia	Then13.9 °CNow16.1 °C	+2.2 °C56.2% · ≈ 23 minflattens faster than before
21	Luxembourg CityLuxembourg	Then12 °CNow14.2 °C	+2.2 °C56.2% · ≈ 23 minflattens faster than before
22	ParisFrance	Then14.2 °CNow16.4 °C	+2.2 °C56.1% · ≈ 23 minflattens faster than before
23	Salt Lake CityUtah	Then15.4 °CNow17.6 °C	+2.2 °C56.1% · ≈ 23 minflattens faster than before
24	SkopjeNorth Macedonia	Then17.4 °CNow19.6 °C	+2.2 °C56% · ≈ 24 minflattens faster than before
25	TallinnEstonia	Then7.9 °CNow10.1 °C	+2.2 °C56.4% · ≈ 23 minflattens faster than before
26	TbilisiGeorgia	Then16.3 °CNow18.5 °C	+2.2 °C56.1% · ≈ 23 minflattens faster than before
27	VaduzLiechtenstein	Then13.1 °CNow15.3 °C	+2.2 °C56.2% · ≈ 23 minflattens faster than before
28	ZagrebCroatia	Then15.1 °CNow17.3 °C	+2.2 °C56.1% · ≈ 23 minflattens faster than before
29	Andorra la VellaAndorra	Then13 °CNow15.1 °C	+2.1 °C55.9% · ≈ 24 minflattens faster than before
30	DushanbeTajikistan	Then18.8 °CNow20.9 °C	+2.1 °C55.7% · ≈ 24 minflattens faster than before
31	PodgoricaMontenegro	Then17.5 °CNow19.6 °C	+2.1 °C55.8% · ≈ 24 minflattens faster than before
32	RomeItaly	Then18.9 °CNow21 °C	+2.1 °C55.7% · ≈ 24 minflattens faster than before
33	StockholmSweden	Then8.5 °CNow10.6 °C	+2.1 °C56.1% · ≈ 23 minflattens faster than before
34	AlbanyNew York	Then13.4 °CNow15.4 °C	+2 °C55.6% · ≈ 24 minflattens faster than before
35	AlgiersAlgeria	Then21.3 °CNow23.3 °C	+2 °C55.4% · ≈ 24 minflattens faster than before
36	BanguiCentral African Republic	Then30.3 °CNow32.3 °C	+2 °C55% · ≈ 24 minflattens faster than before
37	BrusselsBelgium	Then13.3 °CNow15.3 °C	+2 °C55.6% · ≈ 24 minflattens faster than before
38	CopenhagenDenmark	Then10.4 °CNow12.4 °C	+2 °C55.8% · ≈ 24 minflattens faster than before
39	MadridSpain	Then18.9 °CNow20.9 °C	+2 °C55.4% · ≈ 24 minflattens faster than before
40	MonacoMonaco	Then16.8 °CNow18.8 °C	+2 °C55.5% · ≈ 24 minflattens faster than before
41	PristinaKosovo	Then14.9 °CNow16.9 °C	+2 °C55.6% · ≈ 24 minflattens faster than before
42	AmsterdamNetherlands	Then12.1 °CNow14 °C	+1.9 °C55.4% · ≈ 24 minflattens faster than before
43	BoiseIdaho	Then16.2 °CNow18.1 °C	+1.9 °C55.3% · ≈ 24 minflattens faster than before
44	DamascusSyria	Then22.5 °CNow24.4 °C	+1.9 °C55.1% · ≈ 24 minflattens faster than before
45	MontpelierVermont	Then11.1 °CNow13 °C	+1.9 °C55.5% · ≈ 24 minflattens faster than before
46	SarajevoBosnia & Herzegovina	Then14.3 °CNow16.2 °C	+1.9 °C55.3% · ≈ 24 minflattens faster than before
47	TokyoJapan	Then17.5 °CNow19.4 °C	+1.9 °C55.2% · ≈ 24 minflattens faster than before
48	SacramentoCalifornia	Then22.8 °CNow24.6 °C	+1.8 °C54.8% · ≈ 24 minflattens faster than before
49	SofiaBulgaria	Then14.5 °CNow16.3 °C	+1.8 °C55.1% · ≈ 24 minflattens faster than before
50	TiranaAlbania	Then19 °CNow20.8 °C	+1.8 °C54.9% · ≈ 24 minflattens faster than before
51	AnkaraTurkey	Then17.5 °CNow19.2 °C	+1.7 °C54.7% · ≈ 24 minflattens faster than before
52	BaghdadIraq	Then30.6 °CNow32.3 °C	+1.7 °C54.3% · ≈ 24 minflattens faster than before
53	BakuAzerbaijan	Then16.3 °CNow18 °C	+1.7 °C54.7% · ≈ 24 minflattens faster than before
54	ColumbusOhio	Then15.5 °CNow17.2 °C	+1.7 °C54.8% · ≈ 24 minflattens faster than before
55	HelenaMontana	Then11.4 °CNow13.1 °C	+1.7 °C54.9% · ≈ 24 minflattens faster than before
56	IndianapolisIndiana	Then15.7 °CNow17.4 °C	+1.7 °C54.7% · ≈ 24 minflattens faster than before
57	JuneauAlaska	Then6.2 °CNow7.9 °C	+1.7 °C55.1% · ≈ 24 minflattens faster than before
58	LansingMichigan	Then13 °CNow14.7 °C	+1.7 °C54.8% · ≈ 24 minflattens faster than before
59	LincolnNebraska	Then15.9 °CNow17.6 °C	+1.7 °C54.7% · ≈ 24 minflattens faster than before
60	San MarinoSan Marino	Then15.1 °CNow16.8 °C	+1.7 °C54.8% · ≈ 24 minflattens faster than before
61	TashkentUzbekistan	Then19.5 °CNow21.2 °C	+1.7 °C54.6% · ≈ 24 minflattens faster than before
62	TopekaKansas	Then17.5 °CNow19.2 °C	+1.7 °C54.7% · ≈ 24 minflattens faster than before
63	TunisTunisia	Then22.3 °CNow24 °C	+1.7 °C54.5% · ≈ 24 minflattens faster than before
64	AthensGreece	Then21.1 °CNow22.7 °C	+1.6 °C54.3% · ≈ 24 minflattens faster than before
65	BeijingChina	Then17.5 °CNow19.1 °C	+1.6 °C54.4% · ≈ 24 minflattens faster than before
66	BeirutLebanon	Then23 °CNow24.6 °C	+1.6 °C54.3% · ≈ 24 minflattens faster than before
67	BelmopanBelize	Then28.2 °CNow29.8 °C	+1.6 °C54.1% · ≈ 24 minflattens faster than before
68	BishkekKyrgyzstan	Then14.8 °CNow16.4 °C	+1.6 °C54.5% · ≈ 24 minflattens faster than before
69	ConcordNew Hampshire	Then13 °CNow14.6 °C	+1.6 °C54.6% · ≈ 24 minflattens faster than before
70	Des MoinesIowa	Then14.5 °CNow16.1 °C	+1.6 °C54.5% · ≈ 24 minflattens faster than before
71	HarrisburgPennsylvania	Then16 °CNow17.6 °C	+1.6 °C54.5% · ≈ 24 minflattens faster than before
72	JerusalemIsrael	Then22.5 °CNow24.1 °C	+1.6 °C54.3% · ≈ 24 minflattens faster than before
73	LondonUnited Kingdom	Then13.2 °CNow14.8 °C	+1.6 °C54.6% · ≈ 24 minflattens faster than before
74	NashvilleTennessee	Then19.6 °CNow21.2 °C	+1.6 °C54.4% · ≈ 24 minflattens faster than before
75	NicosiaCyprus	Then24.3 °CNow25.9 °C	+1.6 °C54.2% · ≈ 24 minflattens faster than before
76	RamallahPalestine	Then21.9 °CNow23.5 °C	+1.6 °C54.3% · ≈ 24 minflattens faster than before
77	SeoulSouth Korea	Then15.4 °CNow17 °C	+1.6 °C54.5% · ≈ 24 minflattens faster than before
78	SpringfieldIllinois	Then16 °CNow17.6 °C	+1.6 °C54.5% · ≈ 24 minflattens faster than before
79	AmmanJordan	Then23.4 °CNow24.9 °C	+1.5 °C54% · ≈ 24 minflattens faster than before
80	AstanaKazakhstan	Then7.4 °CNow8.9 °C	+1.5 °C54.4% · ≈ 24 minflattens faster than before
81	CairoEgypt	Then28.2 °CNow29.7 °C	+1.5 °C53.9% · ≈ 24 minflattens faster than before
82	Carson CityNevada	Then16.2 °CNow17.7 °C	+1.5 °C54.2% · ≈ 24 minflattens faster than before
83	ColumbiaSouth Carolina	Then22.4 °CNow23.9 °C	+1.5 °C54% · ≈ 24 minflattens faster than before
84	IslamabadPakistan	Then25.5 °CNow27 °C	+1.5 °C53.9% · ≈ 24 minflattens faster than before
85	Kuwait CityKuwait	Then30.6 °CNow32.1 °C	+1.5 °C53.8% · ≈ 24 minflattens faster than before
86	MontgomeryAlabama	Then23.3 °CNow24.8 °C	+1.5 °C54% · ≈ 24 minflattens faster than before
87	PyongyangNorth Korea	Then14.5 °CNow16 °C	+1.5 °C54.2% · ≈ 24 minflattens faster than before
88	ReykjavikIceland	Then5.6 °CNow7.1 °C	+1.5 °C54.5% · ≈ 24 minflattens faster than before
89	RiyadhSaudi Arabia	Then31.6 °CNow33.1 °C	+1.5 °C53.8% · ≈ 24 minflattens faster than before
90	TrentonNew Jersey	Then16.6 °CNow18.1 °C	+1.5 °C54.2% · ≈ 24 minflattens faster than before
91	WindhoekNamibia	Then25.8 °CNow27.3 °C	+1.5 °C53.9% · ≈ 24 minflattens faster than before
92	YaoundéCameroon	Then26.8 °CNow28.3 °C	+1.5 °C53.9% · ≈ 24 minflattens faster than before
93	AnnapolisMaryland	Then17 °CNow18.4 °C	+1.4 °C53.9% · ≈ 24 minflattens faster than before
94	CheyenneWyoming	Then13.3 °CNow14.7 °C	+1.4 °C54% · ≈ 24 minflattens faster than before
95	DoverDelaware	Then17 °CNow18.4 °C	+1.4 °C53.9% · ≈ 24 minflattens faster than before
96	HartfordConnecticut	Then15 °CNow16.4 °C	+1.4 °C53.9% · ≈ 24 minflattens faster than before
97	Jefferson CityMissouri	Then18.1 °CNow19.5 °C	+1.4 °C53.9% · ≈ 24 minflattens faster than before
98	OttawaCanada	Then10.6 °CNow12 °C	+1.4 °C54.1% · ≈ 24 minflattens faster than before
99	PhoenixArizona	Then29 °CNow30.4 °C	+1.4 °C53.6% · ≈ 24 minflattens faster than before
100	SucreBolivia	Then18.3 °CNow19.7 °C	+1.4 °C53.9% · ≈ 24 minflattens faster than before
101	TallahasseeFlorida	Then24.5 °CNow25.9 °C	+1.4 °C53.7% · ≈ 24 minflattens faster than before
102	VallettaMalta	Then20 °CNow21.4 °C	+1.4 °C53.8% · ≈ 24 minflattens faster than before
103	YamoussoukroIvory Coast	Then30.2 °CNow31.6 °C	+1.4 °C53.6% · ≈ 24 minflattens faster than before
104	Abu DhabiUAE	Then31.7 °CNow33 °C	+1.3 °C53.3% · ≈ 24 minflattens faster than before
105	AbujaNigeria	Then30.8 °CNow32.1 °C	+1.3 °C53.3% · ≈ 24 minflattens faster than before
106	AtlantaGeorgia	Then20.8 °CNow22.1 °C	+1.3 °C53.5% · ≈ 24 minflattens faster than before
107	AugustaMaine	Then11.9 °CNow13.2 °C	+1.3 °C53.8% · ≈ 24 minflattens faster than before
108	AustinTexas	Then25.1 °CNow26.4 °C	+1.3 °C53.4% · ≈ 24 minflattens faster than before
109	BrasíliaBrazil	Then25.6 °CNow26.9 °C	+1.3 °C53.4% · ≈ 24 minflattens faster than before
110	HavanaCuba	Then28.5 °CNow29.8 °C	+1.3 °C53.4% · ≈ 24 minflattens faster than before
111	HonoluluHawaii	Then25.7 °CNow27 °C	+1.3 °C53.4% · ≈ 24 minflattens faster than before
112	JacksonMississippi	Then23.2 °CNow24.5 °C	+1.3 °C53.5% · ≈ 24 minflattens faster than before
113	MadisonWisconsin	Then12.5 °CNow13.8 °C	+1.3 °C53.7% · ≈ 24 minflattens faster than before
114	MaseruLesotho	Then21.2 °CNow22.5 °C	+1.3 °C53.5% · ≈ 24 minflattens faster than before
115	Mexico CityMexico	Then21.1 °CNow22.4 °C	+1.3 °C53.5% · ≈ 24 minflattens faster than before
116	PretoriaSouth Africa	Then24 °CNow25.3 °C	+1.3 °C53.5% · ≈ 24 minflattens faster than before
117	RabatMorocco	Then21.9 °CNow23.2 °C	+1.3 °C53.5% · ≈ 24 minflattens faster than before
118	RaleighNorth Carolina	Then20.5 °CNow21.8 °C	+1.3 °C53.5% · ≈ 24 minflattens faster than before
119	RichmondVirginia	Then19.4 °CNow20.7 °C	+1.3 °C53.6% · ≈ 24 minflattens faster than before
120	Saint PaulMinnesota	Then11.6 °CNow12.9 °C	+1.3 °C53.8% · ≈ 24 minflattens faster than before
121	TripoliLibya	Then23.6 °CNow24.9 °C	+1.3 °C53.5% · ≈ 24 minflattens faster than before
122	AsunciónParaguay	Then26.7 °CNow27.9 °C	+1.2 °C53.1% · ≈ 24 minflattens faster than before
123	BamakoMali	Then33.1 °CNow34.3 °C	+1.2 °C53% · ≈ 24 minflattens faster than before
124	Baton RougeLouisiana	Then24.3 °CNow25.5 °C	+1.2 °C53.2% · ≈ 24 minflattens faster than before
125	BostonMassachusetts	Then14.3 °CNow15.5 °C	+1.2 °C53.4% · ≈ 24 minflattens faster than before
126	CharlestonWest Virginia	Then17.8 °CNow19 °C	+1.2 °C53.3% · ≈ 24 minflattens faster than before
127	DjiboutiDjibouti	Then31.8 °CNow33 °C	+1.2 °C53% · ≈ 24 minflattens faster than before
128	DohaQatar	Then31.6 °CNow32.8 °C	+1.2 °C53% · ≈ 24 minflattens faster than before
129	FrankfortKentucky	Then18 °CNow19.2 °C	+1.2 °C53.3% · ≈ 24 minflattens faster than before
130	GaboroneBotswana	Then27.1 °CNow28.3 °C	+1.2 °C53.1% · ≈ 24 minflattens faster than before
131	KampalaUganda	Then23.3 °CNow24.5 °C	+1.2 °C53.2% · ≈ 24 minflattens faster than before
132	KhartoumSudan	Then35.5 °CNow36.7 °C	+1.2 °C53% · ≈ 24 minflattens faster than before
133	LisbonPortugal	Then18.9 °CNow20.1 °C	+1.2 °C53.3% · ≈ 24 minflattens faster than before
134	ManamaBahrain	Then27.4 °CNow28.6 °C	+1.2 °C53.1% · ≈ 24 minflattens faster than before
135	NairobiKenya	Then23.5 °CNow24.7 °C	+1.2 °C53.2% · ≈ 24 minflattens faster than before
136	OlympiaWashington	Then14.9 °CNow16.1 °C	+1.2 °C53.4% · ≈ 24 minflattens faster than before
137	Port-au-PrinceHaiti	Then30.6 °CNow31.8 °C	+1.2 °C53.1% · ≈ 24 minflattens faster than before
138	ProvidenceRhode Island	Then14.7 °CNow15.9 °C	+1.2 °C53.4% · ≈ 24 minflattens faster than before
139	SalemOregon	Then16.3 °CNow17.5 °C	+1.2 °C53.4% · ≈ 24 minflattens faster than before
140	BismarckNorth Dakota	Then11.2 °CNow12.3 °C	+1.1 °C53.2% · ≈ 24 minflattens faster than before
141	Little RockArkansas	Then21.5 °CNow22.6 °C	+1.1 °C53% · ≈ 24 minflattens faster than before
142	Santa FeNew Mexico	Then15.2 °CNow16.3 °C	+1.1 °C53.1% · ≈ 24 minflattens faster than before
143	Santo DomingoDominican Republic	Then28.2 °CNow29.3 °C	+1.1 °C52.9% · ≈ 24 minflattens faster than before
144	Washington D.C.United States	Then18 °CNow19.1 °C	+1.1 °C53.1% · ≈ 24 minflattens faster than before
145	AccraGhana	Then28.4 °CNow29.4 °C	+1 °C52.6% · ≈ 24 minflattens faster than before
146	AsmaraEritrea	Then21.8 °CNow22.8 °C	+1 °C52.7% · ≈ 24 minflattens faster than before
147	DublinIreland	Then12.1 °CNow13.1 °C	+1 °C52.9% · ≈ 24 minflattens faster than before
148	GitegaBurundi	Then22.9 °CNow23.9 °C	+1 °C52.7% · ≈ 24 minflattens faster than before
149	LoméTogo	Then28.6 °CNow29.6 °C	+1 °C52.6% · ≈ 24 minflattens faster than before
150	MuscatOman	Then29.9 °CNow30.9 °C	+1 °C52.6% · ≈ 24 minflattens faster than before
151	Porto-NovoBenin	Then27.8 °CNow28.8 °C	+1 °C52.6% · ≈ 24 minflattens faster than before
152	Washington D.C.District of Columbia	Then18.2 °CNow19.2 °C	+1 °C52.8% · ≈ 24 minflattens faster than before
153	WellingtonNew Zealand	Then14.3 °CNow15.3 °C	+1 °C52.9% · ≈ 24 minflattens faster than before
154	AntananarivoMadagascar	Then22.5 °CNow23.4 °C	+0.9 °C52.4% · ≈ 24 minflattens faster than before
155	BissauGuinea-Bissau	Then31.5 °CNow32.4 °C	+0.9 °C52.3% · ≈ 24 minflattens faster than before
156	HanoiVietnam	Then26.7 °CNow27.6 °C	+0.9 °C52.4% · ≈ 24 minflattens faster than before
157	HarareZimbabwe	Then23.6 °CNow24.5 °C	+0.9 °C52.4% · ≈ 24 minflattens faster than before
158	JakartaIndonesia	Then29.2 °CNow30.1 °C	+0.9 °C52.3% · ≈ 24 minflattens faster than before
159	KabulAfghanistan	Then18 °CNow18.9 °C	+0.9 °C52.5% · ≈ 24 minflattens faster than before
160	LusakaZambia	Then25 °CNow25.9 °C	+0.9 °C52.4% · ≈ 24 minflattens faster than before
161	MalaboEquatorial Guinea	Then27.3 °CNow28.2 °C	+0.9 °C52.4% · ≈ 24 minflattens faster than before
162	MbabaneEswatini	Then21.9 °CNow22.8 °C	+0.9 °C52.4% · ≈ 24 minflattens faster than before
163	NassauBahamas	Then26.1 °CNow27 °C	+0.9 °C52.4% · ≈ 24 minflattens faster than before
164	NouakchottMauritania	Then31 °CNow31.9 °C	+0.9 °C52.3% · ≈ 24 minflattens faster than before
165	Oklahoma CityOklahoma	Then21.4 °CNow22.3 °C	+0.9 °C52.5% · ≈ 24 minflattens faster than before
166	OuagadougouBurkina Faso	Then34.2 °CNow35.1 °C	+0.9 °C52.3% · ≈ 24 minflattens faster than before
167	San SalvadorEl Salvador	Then29 °CNow29.9 °C	+0.9 °C52.3% · ≈ 24 minflattens faster than before
168	VientianeLaos	Then29.7 °CNow30.6 °C	+0.9 °C52.3% · ≈ 24 minflattens faster than before
169	Addis AbabaEthiopia	Then20.8 °CNow21.6 °C	+0.8 °C52.2% · ≈ 24 minflattens faster than before
170	BrazzavilleRepublic of Congo	Then29.4 °CNow30.2 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
171	Buenos AiresArgentina	Then20.1 °CNow20.9 °C	+0.8 °C52.2% · ≈ 24 minflattens faster than before
172	CaracasVenezuela	Then27.4 °CNow28.2 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
173	CastriesSaint Lucia	Then27.3 °CNow28.1 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
174	ConakryGuinea	Then28.3 °CNow29.1 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
175	Guatemala CityGuatemala	Then24.6 °CNow25.4 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
176	KingstonJamaica	Then29.1 °CNow29.9 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
177	KingstownSaint Vincent & Grenadines	Then27 °CNow27.8 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
178	KinshasaDR Congo	Then29.4 °CNow30.2 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
179	LibrevilleGabon	Then27.6 °CNow28.4 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
180	NiameyNiger	Then35.5 °CNow36.3 °C	+0.8 °C52% · ≈ 25 minflattens faster than before
181	Nuku'alofaTonga	Then24.2 °CNow25 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
182	Saint George'sGrenada	Then27.3 °CNow28.1 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
183	Sana'aYemen	Then24.5 °CNow25.3 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
184	SantiagoChile	Then20.6 °CNow21.4 °C	+0.8 °C52.2% · ≈ 24 minflattens faster than before
185	TegucigalpaHonduras	Then27.2 °CNow28 °C	+0.8 °C52.1% · ≈ 24 minflattens faster than before
186	BasseterreSaint Kitts & Nevis	Then26.8 °CNow27.5 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
187	BridgetownBarbados	Then27.3 °CNow28 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
188	KigaliRwanda	Then24.9 °CNow25.6 °C	+0.7 °C51.9% · ≈ 25 minflattens faster than before
189	MaléMaldives	Then27.6 °CNow28.3 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
190	MogadishuSomalia	Then29.8 °CNow30.5 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
191	MonroviaLiberia	Then27.9 °CNow28.6 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
192	MontevideoUruguay	Then18.9 °CNow19.6 °C	+0.7 °C51.9% · ≈ 25 minflattens faster than before
193	MoroniComoros	Then28.5 °CNow29.2 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
194	Panama CityPanama	Then28.7 °CNow29.4 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
195	PierreSouth Dakota	Then14.5 °CNow15.2 °C	+0.7 °C52% · ≈ 25 minflattens faster than before
196	Port VilaVanuatu	Then25.7 °CNow26.4 °C	+0.7 °C51.9% · ≈ 25 minflattens faster than before
197	QuitoEcuador	Then16.1 °CNow16.8 °C	+0.7 °C52% · ≈ 25 minflattens faster than before
198	RoseauDominica	Then26.9 °CNow27.6 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
199	Saint John'sAntigua & Barbuda	Then27.3 °CNow28 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
200	São ToméSão Tomé & Príncipe	Then26.8 °CNow27.5 °C	+0.7 °C51.8% · ≈ 25 minflattens faster than before
201	SuvaFiji	Then25.9 °CNow26.6 °C	+0.7 °C51.9% · ≈ 25 minflattens faster than before
202	ThimphuBhutan	Then15.8 °CNow16.5 °C	+0.7 °C52% · ≈ 25 minflattens faster than before
203	Bandar Seri BegawanBrunei	Then29.2 °CNow29.8 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
204	BanjulGambia	Then29.9 °CNow30.5 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
205	DiliTimor-Leste	Then31.1 °CNow31.7 °C	+0.6 °C51.5% · ≈ 25 minflattens faster than before
206	FreetownSierra Leone	Then27.2 °CNow27.8 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
207	GeorgetownGuyana	Then27.4 °CNow28 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
208	LilongweMalawi	Then25.5 °CNow26.1 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
209	MajuroMarshall Islands	Then27.5 °CNow28.1 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
210	ManilaPhilippines	Then29.6 °CNow30.2 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
211	MaputoMozambique	Then26.1 °CNow26.7 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
212	ParamariboSuriname	Then28.9 °CNow29.5 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
213	Port of SpainTrinidad & Tobago	Then28.1 °CNow28.7 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
214	PraiaCape Verde	Then27.1 °CNow27.7 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
215	San JoséCosta Rica	Then24.3 °CNow24.9 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
216	YarenNauru	Then27.7 °CNow28.3 °C	+0.6 °C51.6% · ≈ 25 minflattens faster than before
217	ColomboSri Lanka	Then29.5 °CNow30 °C	+0.5 °C51.3% · ≈ 25 minflattens faster than before
218	DodomaTanzania	Then28.3 °CNow28.8 °C	+0.5 °C51.3% · ≈ 25 minflattens faster than before
219	FunafutiTuvalu	Then27.9 °CNow28.4 °C	+0.5 °C51.3% · ≈ 25 minflattens faster than before
220	N'DjamenaChad	Then35.2 °CNow35.7 °C	+0.5 °C51.3% · ≈ 25 minflattens faster than before
221	NgerulmudPalau	Then27.6 °CNow28.1 °C	+0.5 °C51.3% · ≈ 25 minflattens faster than before
222	PalikirMicronesia	Then27.5 °CNow28 °C	+0.5 °C51.3% · ≈ 25 minflattens faster than before
223	SingaporeSingapore	Then28.2 °CNow28.7 °C	+0.5 °C51.3% · ≈ 25 minflattens faster than before
224	South TarawaKiribati	Then27.7 °CNow28.2 °C	+0.5 °C51.3% · ≈ 25 minflattens faster than before
225	ApiaSamoa	Then29 °CNow29.4 °C	+0.4 °C51% · ≈ 25 minflattens faster than before
226	BogotáColombia	Then18.5 °CNow18.9 °C	+0.4 °C51.1% · ≈ 25 minflattens faster than before
227	CanberraAustralia	Then17.9 °CNow18.3 °C	+0.4 °C51.1% · ≈ 25 minflattens faster than before
228	DakarSenegal	Then28.4 °CNow28.8 °C	+0.4 °C51% · ≈ 25 minflattens faster than before
229	HoniaraSolomon Islands	Then28.8 °CNow29.2 °C	+0.4 °C51% · ≈ 25 minflattens faster than before
230	ManaguaNicaragua	Then32 °CNow32.4 °C	+0.4 °C51% · ≈ 25 minflattens faster than before
231	Phnom PenhCambodia	Then31.7 °CNow32.1 °C	+0.4 °C51% · ≈ 25 minflattens faster than before
232	Port LouisMauritius	Then27.1 °CNow27.5 °C	+0.4 °C51.1% · ≈ 25 minflattens faster than before
233	Port MoresbyPapua New Guinea	Then29.4 °CNow29.8 °C	+0.4 °C51% · ≈ 25 minflattens faster than before
234	BangkokThailand	Then31.7 °CNow32 °C	+0.3 °C50.8% · ≈ 25 minflattens faster than before
235	KathmanduNepal	Then22.1 °CNow22.4 °C	+0.3 °C50.8% · ≈ 25 minflattens faster than before
236	LuandaAngola	Then29.6 °CNow29.9 °C	+0.3 °C50.8% · ≈ 25 minflattens faster than before
237	NaypyidawMyanmar	Then31 °CNow31.3 °C	+0.3 °C50.8% · ≈ 25 minflattens faster than before

Questions about beer going flat

Why does beer go flat faster in warmer weather?

Dissolved CO2 in a cold drink falls with temperature (Henry's law), and the real relationship isn't a flat rate: it follows the standard temperature coefficient for CO2 in water (2400 K, from Sander's 2015 compilation of Henry's law constants), so the same warming counts for a different amount depending on the actual temperature it happens at, not just its size. Applied to each capital's own hottest-month average daily high, then versus now, the result is a 0 to 100 dial where 50 means unchanged from that same capital's early window: a number above 50 means today's hottest month is warmer, so a beer left out on a terrace now goes flat faster than it did a generation ago.

In which city has beer started going flat the fastest?

Chișinău, Moldova, the biggest increase of any capital measured, not necessarily the hottest overall: its hottest month now averages 16.6°C, up from 13.7°C in 1976-1986, putting its fizz-loss index at 58 out of 100.

Is beer going flat faster everywhere?

No. Of the 245 capitals measured, 243 have a warmer hottest month than they did in 1976-1986, pushing their index above 50, and 2 have a cooler one, pulling their index below it. A capital below 50 is not one where beer stays fizzy forever, it is one whose hottest month has, on this record, not warmed as much as its early window already implied.

Where does this beer data come from?

Daily temperature readings from the ERA5 reanalysis, retrieved through the Open-Meteo historical weather API and stored in full. Every capital shown here has a complete daily record back to 1976; capitals whose backfill is still running are left out entirely rather than shown with a partial figure.

Does this predict exactly how fast my own beer goes flat?

Not precisely, and here is the honest limit of what this page can say. It measures the real physical relationship between temperature and CO2 solubility (Henry's law): how much less carbonation a beer's own climate lets it hold onto, not a stopwatch measurement of any one glass. As a rough illustration only, not a measured rate: if a well-chilled beer commonly stays noticeably fizzy for around 25 minutes in cool weather, Chișinău's hottest month is now roughly 8% less able to hold onto that CO2 than in 1976-1986, which under that same simple assumption would shorten the window to somewhere around 23 minutes, not seconds. Published research on the actual speed of CO2 escaping into visible bubbles (Liger-Belair et al., PLOS ONE, 2012) found that a champagne's serving temperature made essentially no measurable difference to that rate once glass shape, nucleation sites and pour turbulence were in play, so no well-established formula converts solubility into an exact number of minutes for any one drink. What this page measures consistently across every capital is the solubility change itself, the same way every fact in this ledger uses one fixed, published method rather than a method tuned per city.

How this is measured

Dissolved CO2 in a cold drink falls as its temperature rises (Henry's law), following the gas's real temperature dependence rather than a flat per-degree rate. Each capital's fizz-loss index converts its hottest-month average daily high, in kelvin, then versus now, using the standard coefficient for CO2 in water (2400 K, per Sander's 2015 compilation of Henry's law constants), over two 11-year periods, 1976 to 1986 and 2015 to 2025. The result is clamped to a 0 to 100 dial where 50 means unchanged from that early window.

Unlike most facts in this ledger, this one is measured against each capital's own past rather than a fixed reference temperature. That is why the table on this page ranks and shows the two hottest-month temperatures behind the index instead of the index's own "then" and "now": by definition, the index always starts at 50 for every capital's early window, so only the temperatures themselves, and the index they produce today, vary in a way worth ranking.

That is also a deliberate limitation worth stating: this formula captures the equilibrium chemistry of temperature and CO2 solubility, not a controlled measurement of any single glass. It does not account for the drink's starting carbonation, its container, direct sun or how long it actually sits out. Read this table as a description of how much hotter each capital's warmest weather has become, and what that means for CO2 solubility, not as a precise timer for any one beer.

Source data is the ERA5 reanalysis, retrieved through the Open-Meteo historical weather API. Only capitals with a complete daily record back to 1976 appear here; the rest are omitted rather than shown with a partial figure.

Produced by Dennis and a bit of AI. Dennis drank the coffee, AI cleaned up the mess. Read the rest on the About page.