Norwich climate — normals and trends
Norwich (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.7 °C and it receives 1,152 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 (22.9 °C on average) and the coldest is January (-1.4 °C). Rainfall peaks in December.
Norwich averages 95 frost days, 18 hot days (≥ 30 °C) and 120 rainy days per year.
Norwich has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 102 to 88 per year over the period.
The hottest day of the period reached 39.6 °C (on 10 July 1993) and the coldest -25.7 °C (on 13 February 1967).
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
NorwichConnecticut
- coords
- 41.52°, -72.08°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.7°C
Average daily high
15.2°C
Average daily low
6.5°C
Annual rainfall
1,152mm
Sunshine / day
8.8h
Mean relative humidity
70%
Average peak wind
17.5km/h
Seasonal range
24.3°C
Frost days (< 0 °C)
95 d/yr
Hot days (≥ 30 °C)
18 d/yr
Rainy days (≥ 1 mm)
120 d/yr
Annual snowfall
77.1 cm
Average feels-like high
13.5 °C
Average feels-like low
3.8 °C
Average peak gust
41.4 km/h
Tropical nights (≥ 20 °C)
22 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.41 · 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
39.6 °C
10 July 1993
Coldest day
-25.7 °C
13 February 1967
Wettest day
117 mm
21 September 1961
Windiest day
58.9 km/h
12 September 1960
Strongest gust
142.2 km/h
25 November 1950
Hottest feels-like
44.3 °C
26 August 1948
Coldest feels-like
-30.7 °C
13 February 1967
Snowiest day
33.7 cm
4 February 1961
Sunniest day
14.6 h
16 June 2024
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 | 1.8 °C | -0.6 °C | 45 mm | -49 mm |
| Feb | 3.4 °C | -0.1 °C | 80 mm | -6 mm |
| Mar | 10.8 °C | +2.9 °C | 119 mm | +15 mm |
| Apr | 15.5 °C | +1.6 °C | 90 mm | -7 mm |
| May | 19.2 °C | -0.3 °C | 172 mm | +77 mm |
| Jun | 25.8 °C | +1.2 °C | 51 mm | -37 mm |
| Jul | 29.0 °C | +1.2 °C | 91 mm | +2 mm |
| Aug | 26.8 °C | 0.0 °C | 56 mm | -47 mm |
| Sep | 24.3 °C | +1.5 °C | 62 mm | -32 mm |
| Oct | 17.4 °C | +0.4 °C | 91 mm | -2 mm |
| Nov | 10.6 °C | -0.4 °C | 57 mm | -45 mm |
| Dec | 3.4 °C | -1.6 °C | 84 mm | -22 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 Norwich?
Norwich has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.7 °C and it receives 1,152 mm of precipitation per year.
What is the hottest day ever recorded in Norwich?
The hottest day measured in Norwich between 1940 and 2025 was 10 July 1993, reaching 39.6 °C.
What is the coldest day in Norwich?
The coldest day measured in Norwich between 1940 and 2025 was 13 February 1967, at -25.7 °C.
Does it snow in Norwich?
Yes. Norwich gets on average 77.1 cm of snow per year and has around 95 frost days.
Has the climate of Norwich warmed?
Yes: Norwich warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Norwich?
The wettest day measured in Norwich between 1940 and 2025 was 21 September 1961, with 117 mm of rain in 24 hours.
What was the windiest day in Norwich?
The windiest day measured in Norwich between 1940 and 2025 was 12 September 1960, with winds reaching 58.9 km/h.
What is the warmest month in Norwich?
The warmest month in Norwich is July (22.9 °C on average); the coldest is January (-1.4 °C).
How much does it rain in Norwich?
Norwich receives on average 1,152 mm of precipitation per year, spread over about 120 rainy days.
Is it sunny in Norwich?
Norwich 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 Norwich?
The heaviest 24-hour snowfall measured in Norwich between 1940 and 2025 was 4 February 1961, with 33.7 cm.
Are there tropical nights in Norwich?
Yes: Norwich has on average 22 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Norwich?
In Norwich, between 1940 and 2025, the highest apparent temperature reached 44.3 °C on 26 August 1948, and the lowest was -30.7 °C on 13 February 1967.
Compare Norwich with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Norwich