Norwalk climate — normals and trends
Norwalk (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.2 °C and it receives 1,079 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 (-3.2 °C). Rainfall peaks in May.
Norwalk averages 105 frost days, 13 hot days (≥ 30 °C) and 142 rainy days per year.
Norwalk has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 118 to 92 per year over the period.
The hottest day of the period reached 37.4 °C (on 25 June 1988) and the coldest -29.7 °C (on 19 January 1994).
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
NorwalkOhio
- coords
- 41.24°, -82.62°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.2°C
Average daily high
14.1°C
Average daily low
6.6°C
Annual rainfall
1,079mm
Sunshine / day
8.8h
Mean relative humidity
72%
Average peak wind
22.2km/h
Seasonal range
26.2°C
Frost days (< 0 °C)
105 d/yr
Hot days (≥ 30 °C)
13 d/yr
Rainy days (≥ 1 mm)
142 d/yr
Annual snowfall
82.2 cm
Average feels-like high
12.0 °C
Average feels-like low
3.4 °C
Average peak gust
39.5 km/h
Tropical nights (≥ 20 °C)
34 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.33 · 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
37.4 °C
25 June 1988
Coldest day
-29.7 °C
19 January 1994
Wettest day
68 mm
21 January 1959
Windiest day
62.1 km/h
26 January 1978
Strongest gust
106.9 km/h
22 March 1955
Hottest feels-like
41.2 °C
14 July 1995
Coldest feels-like
-38.1 °C
20 January 1985
Snowiest day
26.0 cm
1 December 1974
Sunniest day
15.0 h
18 June 1941
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 | -1.6 °C | 49 mm | -31 mm |
| Feb | 1.4 °C | 0.0 °C | 86 mm | +14 mm |
| Mar | 11.6 °C | +5.1 °C | 73 mm | -21 mm |
| Apr | 15.0 °C | +1.7 °C | 142 mm | +34 mm |
| May | 18.0 °C | -1.7 °C | 147 mm | +39 mm |
| Jun | 25.6 °C | +0.8 °C | 112 mm | +8 mm |
| Jul | 27.8 °C | +1.0 °C | 117 mm | +22 mm |
| Aug | 25.1 °C | -0.9 °C | 37 mm | -51 mm |
| Sep | 24.0 °C | +1.4 °C | 58 mm | -21 mm |
| Oct | 17.5 °C | +1.2 °C | 100 mm | +23 mm |
| Nov | 9.0 °C | -0.2 °C | 65 mm | -24 mm |
| Dec | 2.8 °C | -0.1 °C | 75 mm | -12 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 Norwalk?
Norwalk has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.2 °C and it receives 1,079 mm of precipitation per year.
What is the hottest day ever recorded in Norwalk?
The hottest day measured in Norwalk between 1940 and 2025 was 25 June 1988, reaching 37.4 °C.
What is the coldest day in Norwalk?
The coldest day measured in Norwalk between 1940 and 2025 was 19 January 1994, at -29.7 °C.
Does it snow in Norwalk?
Yes. Norwalk gets on average 82.2 cm of snow per year and has around 105 frost days.
Has the climate of Norwalk warmed?
Yes: Norwalk warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Norwalk?
The wettest day measured in Norwalk between 1940 and 2025 was 21 January 1959, with 68 mm of rain in 24 hours.
What was the windiest day in Norwalk?
The windiest day measured in Norwalk between 1940 and 2025 was 26 January 1978, with winds reaching 62.1 km/h.
What is the warmest month in Norwalk?
The warmest month in Norwalk is July (23.0 °C on average); the coldest is January (-3.2 °C).
How much does it rain in Norwalk?
Norwalk receives on average 1,079 mm of precipitation per year, spread over about 142 rainy days.
Is it sunny in Norwalk?
Norwalk 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 Norwalk?
The heaviest 24-hour snowfall measured in Norwalk between 1940 and 2025 was 1 December 1974, with 26.0 cm.
Are there tropical nights in Norwalk?
Yes: Norwalk has on average 34 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Norwalk?
In Norwalk, between 1940 and 2025, the highest apparent temperature reached 41.2 °C on 14 July 1995, and the lowest was -38.1 °C on 20 January 1985.
Compare Norwalk with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Norwalk