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Hamden, Connecticut climate

Cfa Humid subtropical

Hamden has a strongly seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 85°F, while the coldest is January averaging around 20°F at night. Precipitation is fairly even year-round, totalling about 50 inches.

☀️ Summers

Warm

Highs near 85°F in July.

About 11 days a year above 90 °F

❄️ Winters

Cold

Lows near 20°F in January.

About 109 freezing nights a year

🌧️ Rain

Wet

About 50 in of rain a year.

Wettest in October

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.9 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Hamden climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	38	41	48	61	71	79	85	84	76	64	53	42
Avg temp (°F)	29	31	38	49	60	69	74	73	66	54	43	34
Avg low (°F)	20	22	28	38	48	58	64	62	55	43	34	27
Precipitation (in)	3.6	3.5	4.4	4.7	3.7	4.9	3.8	3.8	4.3	4.9	4.4	4.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	38	41	48	61	71	79
Avg temp (°F)	29	31	38	49	60	69
Avg low (°F)	20	22	28	38	48	58
Precipitation (in)	3.6	3.5	4.4	4.7	3.7	4.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	85	84	76	64	53	42
Avg temp (°F)	74	73	66	54	43	34
Avg low (°F)	64	62	55	43	34	27
Precipitation (in)	3.8	3.8	4.3	4.9	4.4	4.5

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	7	9	9	10	8	8	7	7	8	8	9
Days with high ≥ 90°F (days)	—	—	—	0.1	0.6	2	4	3	0.6	—	—	—
Days with low ≤ 32°F (days)	23	22	19	5	0.3	—	—	—	0.1	4	12	23
Days with snowfall ≥ 1 in (days)	2	2	2	0.2	—	—	0.0	—	—	—	0.2	2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	8	7	9	9	10	8
Days with high ≥ 90°F (days)	—	—	—	0.1	0.6	2
Days with low ≤ 32°F (days)	23	22	19	5	0.3	—
Days with snowfall ≥ 1 in (days)	2	2	2	0.2	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	7	7	8	8	9
Days with high ≥ 90°F (days)	4	3	0.6	—	—	—
Days with low ≤ 32°F (days)	—	—	0.1	4	12	23
Days with snowfall ≥ 1 in (days)	0.0	—	—	—	0.2	2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	64	61	62	63	63	61	57	54	53	57	61	63
Clear days (≤ 30% cloud)	5	6	6	6	5	5	7	8	9	8	6	5
Partly cloudy days (30–70%)	12	10	11	10	12	12	13	12	10	10	10	12
Cloudy days (≥ 70%)	14	13	14	14	15	13	11	11	11	13	14	14
Relative humidity (%)	88	87	83	78	78	77	73	73	74	77	81	86
Wind speed (mph)	1.4	1.7	1.3	0.5	0.3	0.2	0.3	0.3	0.4	0.4	0.4	0.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	64	61	62	63	63	61
Clear days (≤ 30% cloud)	5	6	6	6	5	5
Partly cloudy days (30–70%)	12	10	11	10	12	12
Cloudy days (≥ 70%)	14	13	14	14	15	13
Relative humidity (%)	88	87	83	78	78	77
Wind speed (mph)	1.4	1.7	1.3	0.5	0.3	0.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	54	53	57	61	63
Clear days (≤ 30% cloud)	7	8	9	8	6	5
Partly cloudy days (30–70%)	13	12	10	10	10	12
Cloudy days (≥ 70%)	11	11	11	13	14	14
Relative humidity (%)	73	73	74	77	81	86
Wind speed (mph)	0.3	0.3	0.4	0.4	0.4	0.8

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at MT Carmel (NOAA GHCN station USC00065077), about 1 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →