Danbury climate — normals and trends
Danbury (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.0 °C and it receives 1,204 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 (22.6 °C on average) and the coldest is January (-2.9 °C). Rainfall peaks in August.
Danbury averages 109 frost days, 19 hot days (≥ 30 °C) and 126 rainy days per year.
Danbury has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 120 to 98 per year over the period.
The hottest day of the period reached 39.1 °C (on 3 July 1966) and the coldest -27.1 °C (on 16 February 1943).
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
DanburyConnecticut
- coords
- 41.39°, -73.45°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.0°C
Average daily high
14.7°C
Average daily low
5.7°C
Annual rainfall
1,204mm
Sunshine / day
8.8h
Mean relative humidity
70%
Average peak wind
16.1km/h
Seasonal range
25.5°C
Frost days (< 0 °C)
109 d/yr
Hot days (≥ 30 °C)
19 d/yr
Rainy days (≥ 1 mm)
126 d/yr
Annual snowfall
95.0 cm
Average feels-like high
13.0 °C
Average feels-like low
3.0 °C
Average peak gust
39.5 km/h
Tropical nights (≥ 20 °C)
20 d/yr
Solar radiation
14.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.41 · 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
39.1 °C
3 July 1966
Coldest day
-27.1 °C
16 February 1943
Wettest day
143 mm
16 September 1999
Windiest day
51.3 km/h
25 November 1950
Strongest gust
145.1 km/h
25 November 1950
Hottest feels-like
43.6 °C
26 June 1952
Coldest feels-like
-32.1 °C
12 January 1981
Snowiest day
35.3 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 | 0.5 °C | -0.6 °C | 37 mm | -51 mm |
| Feb | 2.4 °C | -0.2 °C | 82 mm | +1 mm |
| Mar | 11.4 °C | +3.9 °C | 103 mm | +1 mm |
| Apr | 15.7 °C | +1.5 °C | 93 mm | -7 mm |
| May | 19.3 °C | -0.6 °C | 225 mm | +116 mm |
| Jun | 25.5 °C | +0.7 °C | 77 mm | -28 mm |
| Jul | 28.7 °C | +1.1 °C | 123 mm | +11 mm |
| Aug | 26.4 °C | -0.1 °C | 39 mm | -78 mm |
| Sep | 24.1 °C | +1.7 °C | 96 mm | -3 mm |
| Oct | 16.8 °C | +0.4 °C | 153 mm | +57 mm |
| Nov | 9.3 °C | -0.6 °C | 58 mm | -38 mm |
| Dec | 2.0 °C | -1.5 °C | 79 mm | -19 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 Danbury?
Danbury has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.0 °C and it receives 1,204 mm of precipitation per year.
What is the hottest day ever recorded in Danbury?
The hottest day measured in Danbury between 1940 and 2025 was 3 July 1966, reaching 39.1 °C.
What is the coldest day in Danbury?
The coldest day measured in Danbury between 1940 and 2025 was 16 February 1943, at -27.1 °C.
Does it snow in Danbury?
Yes. Danbury gets on average 95.0 cm of snow per year and has around 109 frost days.
Has the climate of Danbury warmed?
Yes: Danbury warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Danbury?
The wettest day measured in Danbury between 1940 and 2025 was 16 September 1999, with 143 mm of rain in 24 hours.
What was the windiest day in Danbury?
The windiest day measured in Danbury between 1940 and 2025 was 25 November 1950, with winds reaching 51.3 km/h.
What is the warmest month in Danbury?
The warmest month in Danbury is July (22.6 °C on average); the coldest is January (-2.9 °C).
How much does it rain in Danbury?
Danbury receives on average 1,204 mm of precipitation per year, spread over about 126 rainy days.
Is it sunny in Danbury?
Danbury gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Danbury?
The heaviest 24-hour snowfall measured in Danbury between 1940 and 2025 was 14 March 2017, with 35.3 cm.
Are there tropical nights in Danbury?
Yes: Danbury has on average 20 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Danbury?
In Danbury, between 1940 and 2025, the highest apparent temperature reached 43.6 °C on 26 June 1952, and the lowest was -32.1 °C on 12 January 1981.
Compare Danbury with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Danbury