New Haven climate — normals and trends
New Haven (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.4 °C and it receives 958 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (23.0 °C on average) and the coldest is January (-3.6 °C). Rainfall peaks in May.
New Haven averages 113 frost days, 25 hot days (≥ 30 °C) and 124 rainy days per year.
New Haven has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 127 to 99 per year over the period.
The hottest day of the period reached 39.6 °C (on 25 June 1988) and the coldest -31.3 °C (on 21 January 1984).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
New HavenIndiana
- coords
- 41.07°, -85.01°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.4°C
Average daily high
15.2°C
Average daily low
5.7°C
Annual rainfall
958mm
Sunshine / day
8.7h
Mean relative humidity
71%
Average peak wind
20.2km/h
Seasonal range
26.6°C
Frost days (< 0 °C)
113 d/yr
Hot days (≥ 30 °C)
25 d/yr
Rainy days (≥ 1 mm)
124 d/yr
Annual snowfall
66.4 cm
Average feels-like high
13.1 °C
Average feels-like low
2.8 °C
Average peak gust
39.1 km/h
Tropical nights (≥ 20 °C)
26 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.40 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
39.6 °C
25 June 1988
Coldest day
-31.3 °C
21 January 1984
Wettest day
86 mm
11 July 1986
Windiest day
60.5 km/h
22 March 1960
Strongest gust
108.7 km/h
11 November 1940
Hottest feels-like
44.1 °C
14 July 1995
Coldest feels-like
-37.4 °C
20 January 1985
Snowiest day
23.3 cm
26 January 1978
Sunniest day
14.8 h
14 June 1973
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -1.1 °C | -1.3 °C | 41 mm | -26 mm |
| Feb | 2.6 °C | +0.4 °C | 44 mm | -18 mm |
| Mar | 13.6 °C | +5.2 °C | 119 mm | +32 mm |
| Apr | 16.9 °C | +1.5 °C | 117 mm | +17 mm |
| May | 20.1 °C | -1.2 °C | 109 mm | +7 mm |
| Jun | 27.8 °C | +1.6 °C | 119 mm | +23 mm |
| Jul | 29.6 °C | +1.6 °C | 115 mm | +32 mm |
| Aug | 27.1 °C | -0.1 °C | 30 mm | -47 mm |
| Sep | 27.0 °C | +3.1 °C | 24 mm | -43 mm |
| Oct | 20.3 °C | +2.9 °C | 49 mm | -20 mm |
| Nov | 9.8 °C | +0.3 °C | 57 mm | -21 mm |
| Dec | 2.5 °C | -0.3 °C | 49 mm | -23 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of New Haven?
New Haven has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.4 °C and it receives 958 mm of precipitation per year.
What is the hottest day ever recorded in New Haven?
The hottest day measured in New Haven between 1940 and 2025 was 25 June 1988, reaching 39.6 °C.
What is the coldest day in New Haven?
The coldest day measured in New Haven between 1940 and 2025 was 21 January 1984, at -31.3 °C.
Does it snow in New Haven?
Yes. New Haven gets on average 66.4 cm of snow per year and has around 113 frost days.
Has the climate of New Haven warmed?
Yes: New Haven warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in New Haven?
The wettest day measured in New Haven between 1940 and 2025 was 11 July 1986, with 86 mm of rain in 24 hours.
What was the windiest day in New Haven?
The windiest day measured in New Haven between 1940 and 2025 was 22 March 1960, with winds reaching 60.5 km/h.
What is the warmest month in New Haven?
The warmest month in New Haven is July (23.0 °C on average); the coldest is January (-3.6 °C).
How much does it rain in New Haven?
New Haven receives on average 958 mm of precipitation per year, spread over about 124 rainy days.
Is it sunny in New Haven?
New Haven gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in New Haven?
The heaviest 24-hour snowfall measured in New Haven between 1940 and 2025 was 26 January 1978, with 23.3 cm.
Are there tropical nights in New Haven?
Yes: New Haven has on average 26 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in New Haven?
In New Haven, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 14 July 1995, and the lowest was -37.4 °C on 20 January 1985.
Compare New Haven with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around New Haven