New Haven, CT Climate & Monthly Averages
The climate of New Haven
Cold is the baseline in New Haven, not the exception. Night-time lows sit at or below freezing in 4 months of the year, and the warmest month, July, still only averages 82°F (28°C) by day. January runs to 26°F (-4°C) after dark.
Climate quick facts
- Hottest month: July - highs near 82°F (28°C)
- Coldest month: January - highs near 39°F (4°C)
- Decade extremes (2015-2024): 95°F (35°C) high · -8°F (-22°C) low
- Wettest month: December (11 rainy days) · Sunniest: July (11.5 h sun/day)
- Climate type: humid subtropical
- Annual swing: 24°C between the average warmest and coolest month · day to night: 8°C
- Snow: about 12 days a year
- Months with freezing average lows: 4
- Average humidity: 71%
Temperatures through the year
Precipitation concentrates in December - 5.1 inches (130 mm) on 11 days - and thins out by November. Warmth peaks in July: highs of 82°F (28°C), lows of 68°F (20°C). January is the coolest month, with highs of 39°F (4°C) and lows near 26°F (-4°C). Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 95°F (35°C) and the lowest daily minimum -8°F (-22°C). Between the average July and the average January lie 24°C, a wider spread than roughly 78% of the cities we track.
Rain, sun and snow
Three of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is May through June. Snow falls on roughly 12 days a year, mostly December through March.
How New Haven compares
- 26% of the year's precipitation falls in its wettest three months - more evenly spread than almost every other city we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
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 stays on the cool side of mild, with daytime highs averaging 57°F (14°C) and nights around 41°F (5°C); rain falls on around 34 of the 90 days, plus about 3 snowy days.
Summer (June through August)
Summer in New Haven settles into easy warmth, with daytime highs averaging 80°F (26°C) and nights around 65°F (18°C); rain falls on around 34 of the 90 days. Daylight is generous - around 11.2 hours of sun a day.
Fall (September through November)
Fall in New Haven runs cool rather than cold, 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 runs cold, with daytime highs averaging 41°F (5°C) and nights around 28°F (-2°C); rain falls on around 31 of the 90 days, plus about 9 snowy days.
Climate questions, answered
How cold does New Haven get in winter?
How much sun does New Haven get?
How often does it rain in New Haven?
What is the average temperature in New Haven?
Is New Haven hot in summer?
Best time to visit New Haven
The best time to visit New Haven is generally May to October, when these are the warmest and brightest weeks of the year. Daytime temperatures in that window sit near 74°F (23°C), with rain on about 11 days a month. For the same question asked the other way round, see where else is warm in May.
Pack for New Haven with light clothing for the warm months, a heavy insulated coat, hat and gloves for winter and a compact umbrella or rain shell. Even in July, lows of 68°F (20°C) make an extra layer worth the space.
New Haven temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.