Trumbull climate — normals and trends
Trumbull (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.0 °C and it receives 1,205 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 (23.2 °C on average) and the coldest is January (-1.2 °C). Rainfall peaks in March.
Trumbull averages 82 frost days, 12 hot days (≥ 30 °C) and 122 rainy days per year.
Trumbull has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 92 to 72 per year over the period.
The hottest day of the period reached 37.6 °C (on 18 July 2012) and the coldest -20.7 °C (on 15 January 1957).
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
TrumbullConnecticut
- coords
- 41.24°, -73.20°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.0°C
Average daily high
14.7°C
Average daily low
7.6°C
Annual rainfall
1,205mm
Sunshine / day
8.9h
Mean relative humidity
71%
Average peak wind
19.3km/h
Seasonal range
24.4°C
Frost days (< 0 °C)
82 d/yr
Hot days (≥ 30 °C)
12 d/yr
Rainy days (≥ 1 mm)
122 d/yr
Annual snowfall
76.7 cm
Average feels-like high
13.0 °C
Average feels-like low
4.7 °C
Average peak gust
39.2 km/h
Tropical nights (≥ 20 °C)
33 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °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
37.6 °C
18 July 2012
Coldest day
-20.7 °C
15 January 1957
Wettest day
151 mm
14 September 1944
Windiest day
63.3 km/h
25 November 1950
Strongest gust
146.2 km/h
25 November 1950
Hottest feels-like
42.1 °C
26 August 1948
Coldest feels-like
-28.3 °C
25 December 1980
Snowiest day
30.1 cm
14 March 2017
Sunniest day
14.4 h
17 June 2021
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 | 1.4 °C | -0.7 °C | 38 mm | -59 mm |
| Feb | 3.1 °C | 0.0 °C | 95 mm | +4 mm |
| Mar | 10.4 °C | +3.2 °C | 119 mm | +6 mm |
| Apr | 14.6 °C | +1.4 °C | 101 mm | -4 mm |
| May | 18.4 °C | -0.3 °C | 189 mm | +87 mm |
| Jun | 24.8 °C | +0.8 °C | 55 mm | -32 mm |
| Jul | 28.4 °C | +1.2 °C | 104 mm | +13 mm |
| Aug | 26.3 °C | 0.0 °C | 47 mm | -56 mm |
| Sep | 23.8 °C | +1.3 °C | 80 mm | -16 mm |
| Oct | 17.2 °C | +0.4 °C | 174 mm | +72 mm |
| Nov | 10.4 °C | -0.3 °C | 63 mm | -43 mm |
| Dec | 3.2 °C | -1.6 °C | 83 mm | -29 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 Trumbull?
Trumbull has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.0 °C and it receives 1,205 mm of precipitation per year.
What is the hottest day ever recorded in Trumbull?
The hottest day measured in Trumbull between 1940 and 2025 was 18 July 2012, reaching 37.6 °C.
What is the coldest day in Trumbull?
The coldest day measured in Trumbull between 1940 and 2025 was 15 January 1957, at -20.7 °C.
Does it snow in Trumbull?
Yes. Trumbull gets on average 76.7 cm of snow per year and has around 82 frost days.
Has the climate of Trumbull warmed?
Yes: Trumbull warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Trumbull?
The wettest day measured in Trumbull between 1940 and 2025 was 14 September 1944, with 151 mm of rain in 24 hours.
What was the windiest day in Trumbull?
The windiest day measured in Trumbull between 1940 and 2025 was 25 November 1950, with winds reaching 63.3 km/h.
What is the warmest month in Trumbull?
The warmest month in Trumbull is July (23.2 °C on average); the coldest is January (-1.2 °C).
How much does it rain in Trumbull?
Trumbull receives on average 1,205 mm of precipitation per year, spread over about 122 rainy days.
Is it sunny in Trumbull?
Trumbull gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Trumbull?
The heaviest 24-hour snowfall measured in Trumbull between 1940 and 2025 was 14 March 2017, with 30.1 cm.
Are there tropical nights in Trumbull?
Yes: Trumbull has on average 33 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Trumbull?
In Trumbull, between 1940 and 2025, the highest apparent temperature reached 42.1 °C on 26 August 1948, and the lowest was -28.3 °C on 25 December 1980.
Compare Trumbull with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Trumbull