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 | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 39° | 26° | 10 | 4.4 in | 6.2 h/day | 9.5 h | 32% | 66% |
| February | 41° | 26° | 10 | 3.7 in | 6.9 h/day | 10.6 h | 35% | 69% |
| March | 47° | 31° | 11 | 4.4 in | 8.3 h/day | 11.8 h | 35% | 65% |
| April | 57° | 40° | 12 | 4.9 in | 8.7 h/day | 13.3 h | 39% | 68% |
| May | 67° | 51° | 11 | 3.8 in | 10.0 h/day | 14.5 h | 36% | 73% |
| June | 76° | 60° | 11 | 3.6 in | 11.2 h/day | 15.1 h | 35% | 74% |
| July | 82° | 68° | 12 | 4.8 in | 11.5 h/day | 14.9 h | 38% | 76% |
| August | 81° | 67° | 11 | 4.1 in | 10.9 h/day | 13.8 h | 36% | 75% |
| September | 74° | 61° | 9 | 4.6 in | 9.2 h/day | 12.4 h | 29% | 75% |
| October | 64° | 50° | 10 | 4.7 in | 7.8 h/day | 11.0 h | 31% | 74% |
| November | 53° | 39° | 8 | 3.4 in | 6.9 h/day | 9.8 h | 28% | 69% |
| December | 44° | 31° | 11 | 5.1 in | 5.7 h/day | 9.2 h | 36% | 71% |
New Haven month by month
Average high and low for each month, with the bar showing where it sits in New Haven's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 10 days
- Sunshine
- 6.2 h
- Daylight
- 9.5 h
- Snow
- 3 days
February
- Rain
- 10 days
- Sunshine
- 6.9 h
- Daylight
- 10.6 h
- Snow
- 4 days
March
- Rain
- 11 days
- Sunshine
- 8.3 h
- Daylight
- 11.8 h
- Snow
- 2 days
April
- Rain
- 12 days
- Sunshine
- 8.7 h
- Daylight
- 13.3 h
May
- Rain
- 11 days
- Sunshine
- 10.0 h
- Daylight
- 14.5 h
June
- Rain
- 11 days
- Sunshine
- 11.2 h
- Daylight
- 15.1 h
July
- Rain
- 12 days
- Sunshine
- 11.5 h
- Daylight
- 14.9 h
August
- Rain
- 11 days
- Sunshine
- 10.9 h
- Daylight
- 13.8 h
September
- Rain
- 9 days
- Sunshine
- 9.2 h
- Daylight
- 12.4 h
October
- Rain
- 10 days
- Sunshine
- 7.8 h
- Daylight
- 11.0 h
November
- Rain
- 8 days
- Sunshine
- 6.9 h
- Daylight
- 9.8 h
December
- Rain
- 11 days
- Sunshine
- 5.7 h
- Daylight
- 9.2 h
- Snow
- 2 days
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
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. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.