Wilton climate — normals and trends
Wilton (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.0 °C and it receives 1,219 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 (21.3 °C on average) and the coldest is January (-6.3 °C). Rainfall peaks in May.
Wilton averages 135 frost days, 12 hot days (≥ 30 °C) and 134 rainy days per year.
Wilton has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 146 to 124 per year over the period.
The hottest day of the period reached 36.5 °C (on 2 September 1953) and the coldest -32.6 °C (on 14 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
WiltonNew York
- coords
- 43.18°, -73.74°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.0°C
Average daily high
12.9°C
Average daily low
3.2°C
Annual rainfall
1,219mm
Sunshine / day
8.4h
Mean relative humidity
72%
Average peak wind
14.2km/h
Seasonal range
27.6°C
Frost days (< 0 °C)
135 d/yr
Hot days (≥ 30 °C)
12 d/yr
Rainy days (≥ 1 mm)
134 d/yr
Annual snowfall
147.5 cm
Average feels-like high
10.9 °C
Average feels-like low
0.6 °C
Average peak gust
36.4 km/h
Tropical nights (≥ 20 °C)
7 d/yr
Solar radiation
13.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.45 · 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
36.5 °C
2 September 1953
Coldest day
-32.6 °C
14 January 1957
Wettest day
108 mm
28 August 2011
Windiest day
44.3 km/h
25 November 1950
Strongest gust
129.2 km/h
25 November 1950
Hottest feels-like
42.0 °C
26 August 1948
Coldest feels-like
-37.2 °C
14 January 1957
Snowiest day
42.5 cm
14 February 2007
Sunniest day
14.8 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 | -1.8 °C | +0.2 °C | 45 mm | -40 mm |
| Feb | -0.7 °C | -0.4 °C | 100 mm | +21 mm |
| Mar | 8.9 °C | +3.9 °C | 73 mm | -27 mm |
| Apr | 14.1 °C | +1.6 °C | 94 mm | -13 mm |
| May | 18.3 °C | -1.0 °C | 206 mm | +92 mm |
| Jun | 25.1 °C | +1.2 °C | 94 mm | -19 mm |
| Jul | 29.0 °C | +2.4 °C | 85 mm | -26 mm |
| Aug | 26.2 °C | +0.8 °C | 37 mm | -64 mm |
| Sep | 23.6 °C | +2.5 °C | 85 mm | -16 mm |
| Oct | 15.9 °C | +1.3 °C | 153 mm | +48 mm |
| Nov | 6.2 °C | -1.2 °C | 74 mm | -30 mm |
| Dec | -0.7 °C | -1.4 °C | 91 mm | -8 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 Wilton?
Wilton has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.0 °C and it receives 1,219 mm of precipitation per year.
What is the hottest day ever recorded in Wilton?
The hottest day measured in Wilton between 1940 and 2025 was 2 September 1953, reaching 36.5 °C.
What is the coldest day in Wilton?
The coldest day measured in Wilton between 1940 and 2025 was 14 January 1957, at -32.6 °C.
Does it snow in Wilton?
Yes. Wilton gets on average 147.5 cm of snow per year and has around 135 frost days.
Has the climate of Wilton warmed?
Yes: Wilton warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Wilton?
The wettest day measured in Wilton between 1940 and 2025 was 28 August 2011, with 108 mm of rain in 24 hours.
What was the windiest day in Wilton?
The windiest day measured in Wilton between 1940 and 2025 was 25 November 1950, with winds reaching 44.3 km/h.
What is the warmest month in Wilton?
The warmest month in Wilton is July (21.3 °C on average); the coldest is January (-6.3 °C).
How much does it rain in Wilton?
Wilton receives on average 1,219 mm of precipitation per year, spread over about 134 rainy days.
Is it sunny in Wilton?
Wilton gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Wilton?
The heaviest 24-hour snowfall measured in Wilton between 1940 and 2025 was 14 February 2007, with 42.5 cm.
Are there tropical nights in Wilton?
Yes: Wilton has on average 7 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Wilton?
In Wilton, between 1940 and 2025, the highest apparent temperature reached 42.0 °C on 26 August 1948, and the lowest was -37.2 °C on 14 January 1957.
Compare Wilton with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Wilton