New Haven, CT Climate & Monthly Averages
The climate of New Haven
Located in Connecticut, United States, New Haven experiences a humid subtropical climate with hot, humid summers and generally mild winters. Afternoon temperatures peak near 82°F (28°C) in July and dip to about 39°F (4°C) in January, with around 51.6 inches (1310 mm) of precipitation falling across the year.
Climate quick facts
- Hottest month: July - highs near 82°F (28°C)
- Coldest month: January - highs near 39°F (4°C)
- Record high: 95°F (35°C) · Record low: -8°F (-22°C) (2015–2024)
- Wettest month: December (11 rainy days) · Sunniest: July (11.5 h sun/day)
- Climate type: humid subtropical - hot, humid summers and generally mild winters
- Snow: about 12 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 82°F (28°C) and overnight lows stay near 68°F (20°C). The coolest month is January, with typical highs of 39°F (4°C) and lows around 26°F (-4°C). Based on 2015–2024 weather data, temperatures have reached as high as 95°F (35°C) and dropped as low as -8°F (-22°C).
Rain, sun and snow
December is usually the wettest month. It brings about 5.1 inches (130 mm) of rain over 11 days, while November is the driest. July brings the most sunshine, averaging 11.5 hours of sun a day. Snow falls on about 12 days in a typical year, mostly from December through March.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 39° | 26° | 10 | 4.4 in | 6.2 h/day | 66% |
| February | 41° | 26° | 10 | 3.7 in | 6.9 h/day | 69% |
| March | 47° | 31° | 11 | 4.4 in | 8.3 h/day | 65% |
| April | 57° | 40° | 12 | 4.9 in | 8.7 h/day | 68% |
| May | 67° | 51° | 11 | 3.8 in | 10.0 h/day | 73% |
| June | 76° | 60° | 11 | 3.6 in | 11.2 h/day | 74% |
| July | 82° | 68° | 12 | 4.8 in | 11.5 h/day | 76% |
| August | 81° | 67° | 11 | 4.1 in | 10.9 h/day | 75% |
| September | 74° | 61° | 9 | 4.6 in | 9.2 h/day | 75% |
| October | 64° | 50° | 10 | 4.7 in | 7.8 h/day | 74% |
| November | 53° | 39° | 8 | 3.4 in | 6.9 h/day | 69% |
| December | 44° | 31° | 11 | 5.1 in | 5.7 h/day | 71% |
New Haven month by month
New Haven weather in January
January brings highs around 39°F (4°C), lows near 26°F (-4°C), about 10 wet days and roughly 3 snowy days - typically the coldest month of the year in New Haven.
New Haven weather in February
February brings highs around 41°F (5°C), lows near 26°F (-4°C), about 10 wet days and roughly 4 snowy days.
New Haven weather in March
March brings highs around 47°F (8°C), lows near 31°F (0°C), about 11 wet days and roughly 2 snowy days.
New Haven weather in April
April brings highs around 57°F (14°C), lows near 40°F (5°C), about 12 wet days.
New Haven weather in May
May brings highs around 67°F (19°C), lows near 51°F (10°C), about 11 wet days.
New Haven weather in June
June brings highs around 76°F (24°C), lows near 60°F (16°C), about 11 wet days.
New Haven weather in July
July brings highs around 82°F (28°C), lows near 68°F (20°C), about 12 wet days - typically the hottest month and the sunniest month of the year in New Haven.
New Haven weather in August
August brings highs around 81°F (27°C), lows near 67°F (20°C), about 11 wet days.
New Haven weather in September
September brings highs around 74°F (24°C), lows near 61°F (16°C), about 9 wet days.
New Haven weather in October
October brings highs around 64°F (18°C), lows near 50°F (10°C), about 10 wet days.
New Haven weather in November
November brings highs around 53°F (12°C), lows near 39°F (4°C), about 8 wet days - typically the driest month of the year in New Haven.
New Haven weather in December
December brings highs around 44°F (6°C), lows near 31°F (0°C), about 11 wet days and roughly 2 snowy days - typically the wettest month of the year in New Haven.
Seasons in New Haven
Spring (March through May)
Spring in New Haven is crisp but comfortable, with daytime highs averaging 57°F (14°C) and nights around 41°F (5°C); expect showers on roughly 34 days across the season, plus around 3 snowy days.
Summer (June through August)
Summer in New Haven is pleasantly warm, with daytime highs averaging 80°F (26°C) and nights around 65°F (18°C); expect showers on roughly 34 days across the season.
Fall (September through November)
Fall in New Haven is mild, with daytime highs averaging 64°F (18°C) and nights around 50°F (10°C); expect showers on roughly 27 days across the season.
Winter (December through February)
Winter in New Haven is brisk and cold, with daytime highs averaging 41°F (5°C) and nights around 28°F (-2°C); expect showers on roughly 31 days across the season, plus around 9 snowy days.
Climate questions, answered
What is the average temperature in New Haven?
Is New Haven hot in summer?
Is New Haven cold in winter?
How many rainy days does New Haven get in a year?
Best time to visit New Haven
The best time to visit New Haven is generally May to October, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window typically sit near 74°F (23°C).
Pack for New Haven with a heavy insulated coat, hat and gloves for winter; a compact umbrella or rain shell - showers are a regular feature. Evenings can feel noticeably cooler than afternoons - July nights average 68°F (20°C).
New Haven temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.