Williston climate — normals and trends
Williston (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 5.0 °C and it receives 449 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 (20.9 °C on average) and the coldest is January (-12.1 °C). Rainfall peaks in June.
Williston averages 173 frost days, 23 hot days (≥ 30 °C) and 80 rainy days per year.
Williston has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 43.6 °C (on 7 August 1949) and the coldest -41.7 °C (on 20 January 1954).
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
WillistonNorth Dakota
- coords
- 48.15°, -103.62°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
5.0°C
Average daily high
10.6°C
Average daily low
-0.4°C
Annual rainfall
449mm
Sunshine / day
9.4h
Mean relative humidity
67%
Average peak wind
22.4km/h
Seasonal range
33.0°C
Frost days (< 0 °C)
173 d/yr
Hot days (≥ 30 °C)
23 d/yr
Rainy days (≥ 1 mm)
80 d/yr
Annual snowfall
73.5 cm
Average feels-like high
6.9 °C
Average feels-like low
-4.4 °C
Average peak gust
39.0 km/h
Tropical nights (≥ 20 °C)
2 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.08 · p = 0.008
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
43.6 °C
7 August 1949
Coldest day
-41.7 °C
20 January 1954
Wettest day
62 mm
9 July 2019
Windiest day
63.6 km/h
13 February 2011
Strongest gust
105.5 km/h
30 April 2011
Hottest feels-like
44.2 °C
28 July 1975
Coldest feels-like
-47.6 °C
26 January 1950
Snowiest day
25.4 cm
23 April 2022
Sunniest day
15.9 h
17 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 | -7.3 °C | +0.2 °C | 11 mm | -5 mm |
| Feb | -10.2 °C | -5.6 °C | 8 mm | -5 mm |
| Mar | 6.6 °C | +4.7 °C | 12 mm | -11 mm |
| Apr | 12.7 °C | +1.6 °C | 47 mm | +6 mm |
| May | 19.8 °C | +1.7 °C | 109 mm | +45 mm |
| Jun | 24.0 °C | +1.0 °C | 29 mm | -52 mm |
| Jul | 27.0 °C | -0.2 °C | 76 mm | +21 mm |
| Aug | 26.7 °C | -0.1 °C | 60 mm | +13 mm |
| Sep | 24.2 °C | +3.7 °C | 30 mm | -13 mm |
| Oct | 15.2 °C | +2.4 °C | 43 mm | +13 mm |
| Nov | 5.0 °C | +2.6 °C | 27 mm | +8 mm |
| Dec | -4.9 °C | -0.3 °C | 25 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 Williston?
Williston has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 5.0 °C and it receives 449 mm of precipitation per year.
What is the hottest day ever recorded in Williston?
The hottest day measured in Williston between 1940 and 2025 was 7 August 1949, reaching 43.6 °C.
What is the coldest day in Williston?
The coldest day measured in Williston between 1940 and 2025 was 20 January 1954, at -41.7 °C.
Does it snow in Williston?
Yes. Williston gets on average 73.5 cm of snow per year and has around 173 frost days.
Has the climate of Williston warmed?
Yes: Williston warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Williston?
The wettest day measured in Williston between 1940 and 2025 was 9 July 2019, with 62 mm of rain in 24 hours.
What was the windiest day in Williston?
The windiest day measured in Williston between 1940 and 2025 was 13 February 2011, with winds reaching 63.6 km/h.
What is the warmest month in Williston?
The warmest month in Williston is July (20.9 °C on average); the coldest is January (-12.1 °C).
How much does it rain in Williston?
Williston receives on average 449 mm of precipitation per year, spread over about 80 rainy days.
Is it sunny in Williston?
Williston gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.
What is the biggest single-day snowfall in Williston?
The heaviest 24-hour snowfall measured in Williston between 1940 and 2025 was 23 April 2022, with 25.4 cm.
Are there tropical nights in Williston?
Yes: Williston has on average 2 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Williston?
In Williston, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 28 July 1975, and the lowest was -47.6 °C on 26 January 1950.
Compare Williston with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Williston