Willmar climate — normals and trends
Willmar (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 6.6 °C and it receives 788 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 (22.2 °C on average) and the coldest is January (-11.4 °C). Rainfall peaks in June.
Willmar averages 156 frost days, 20 hot days (≥ 30 °C) and 99 rainy days per year.
Willmar has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The number of frost days there went from about 163 to 149 per year over the period.
The hottest day of the period reached 39.8 °C (on 5 June 2021) and the coldest -38.0 °C (on 19 January 1970).
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
WillmarMinnesota
- coords
- 45.12°, -95.04°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.6°C
Average daily high
11.6°C
Average daily low
1.7°C
Annual rainfall
788mm
Sunshine / day
9.0h
Mean relative humidity
71%
Average peak wind
22.5km/h
Seasonal range
33.6°C
Frost days (< 0 °C)
156 d/yr
Hot days (≥ 30 °C)
20 d/yr
Rainy days (≥ 1 mm)
99 d/yr
Annual snowfall
86.6 cm
Average feels-like high
8.7 °C
Average feels-like low
-2.0 °C
Average peak gust
40.1 km/h
Tropical nights (≥ 20 °C)
13 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.28 · 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
39.8 °C
5 June 2021
Coldest day
-38.0 °C
19 January 1970
Wettest day
92 mm
29 May 1942
Windiest day
68.1 km/h
11 January 1975
Strongest gust
122.0 km/h
10 October 1949
Hottest feels-like
43.9 °C
5 July 1948
Coldest feels-like
-44.8 °C
2 February 1996
Snowiest day
25.1 cm
19 November 1948
Sunniest day
15.0 h
12 June 1940
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 | -4.3 °C | +2.7 °C | 5 mm | -18 mm |
| Feb | -4.3 °C | +0.1 °C | 16 mm | -7 mm |
| Mar | 9.9 °C | +7.2 °C | 69 mm | +21 mm |
| Apr | 13.8 °C | +1.2 °C | 95 mm | +18 mm |
| May | 21.3 °C | +1.3 °C | 97 mm | -3 mm |
| Jun | 25.5 °C | +0.5 °C | 173 mm | +51 mm |
| Jul | 27.7 °C | +0.3 °C | 119 mm | +28 mm |
| Aug | 25.5 °C | -0.7 °C | 107 mm | +10 mm |
| Sep | 24.1 °C | +2.6 °C | 58 mm | -22 mm |
| Oct | 17.1 °C | +2.4 °C | 61 mm | +1 mm |
| Nov | 7.1 °C | +2.7 °C | 28 mm | -12 mm |
| Dec | -2.4 °C | +1.4 °C | 35 mm | +7 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 Willmar?
Willmar has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 6.6 °C and it receives 788 mm of precipitation per year.
What is the hottest day ever recorded in Willmar?
The hottest day measured in Willmar between 1940 and 2025 was 5 June 2021, reaching 39.8 °C.
What is the coldest day in Willmar?
The coldest day measured in Willmar between 1940 and 2025 was 19 January 1970, at -38.0 °C.
Does it snow in Willmar?
Yes. Willmar gets on average 86.6 cm of snow per year and has around 156 frost days.
Has the climate of Willmar warmed?
Yes: Willmar warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Willmar?
The wettest day measured in Willmar between 1940 and 2025 was 29 May 1942, with 92 mm of rain in 24 hours.
What was the windiest day in Willmar?
The windiest day measured in Willmar between 1940 and 2025 was 11 January 1975, with winds reaching 68.1 km/h.
What is the warmest month in Willmar?
The warmest month in Willmar is July (22.2 °C on average); the coldest is January (-11.4 °C).
How much does it rain in Willmar?
Willmar receives on average 788 mm of precipitation per year, spread over about 99 rainy days.
Is it sunny in Willmar?
Willmar gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.
What is the biggest single-day snowfall in Willmar?
The heaviest 24-hour snowfall measured in Willmar between 1940 and 2025 was 19 November 1948, with 25.1 cm.
Are there tropical nights in Willmar?
Yes: Willmar has on average 13 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Willmar?
In Willmar, between 1940 and 2025, the highest apparent temperature reached 43.9 °C on 5 July 1948, and the lowest was -44.8 °C on 2 February 1996.
Compare Willmar with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Willmar