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Williston, North Dakota climate
Dfb Warm-summer humid continental
Williston has a strongly seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 30°C, while the coldest is January averaging around −17°C at night. Precipitation totals about 410 mm a year and is strongly seasonal — July alone averages 71 mm while February barely receives 13 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Williston climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −4 | −2 | 6 | 15 | 21 | 26 | 30 | 30 | 24 | 15 | 5 | −2 |
| Avg temp (°C) | −11 | −8 | −1 | 7 | 13 | 18 | 22 | 21 | 15 | 7 | −2 | −8 |
| Avg low (°C) | −17 | −15 | −8 | −2 | 4 | 9 | 13 | 12 | 6 | −1 | −8 | −15 |
| Precipitation (mm) | 15 | 13 | 17 | 27 | 55 | 71 | 71 | 41 | 38 | 25 | 19 | 19 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −4 | −2 | 6 | 15 | 21 | 26 |
| Avg temp (°C) | −11 | −8 | −1 | 7 | 13 | 18 |
| Avg low (°C) | −17 | −15 | −8 | −2 | 4 | 9 |
| Precipitation (mm) | 15 | 13 | 17 | 27 | 55 | 71 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 24 | 15 | 5 | −2 |
| Avg temp (°C) | 22 | 21 | 15 | 7 | −2 | −8 |
| Avg low (°C) | 13 | 12 | 6 | −1 | −8 | −15 |
| Precipitation (mm) | 71 | 41 | 38 | 25 | 19 | 19 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 64 | 63 | 66 | 65 | 64 | 61 | 49 | 50 | 55 | 65 | 67 | 67 |
| Relative humidity (%) | 86 | 79 | 68 | 59 | 56 | 56 | 52 | 52 | 56 | 65 | 75 | 84 |
| Wind speed (mph) | 8.2 | 8.2 | 8.8 | 8.7 | 8.3 | 7.7 | 6.8 | 6.9 | 7.5 | 8.2 | 8.1 | 8.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 64 | 63 | 66 | 65 | 64 | 61 |
| Relative humidity (%) | 86 | 79 | 68 | 59 | 56 | 56 |
| Wind speed (mph) | 8.2 | 8.2 | 8.8 | 8.7 | 8.3 | 7.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 50 | 55 | 65 | 67 | 67 |
| Relative humidity (%) | 52 | 52 | 56 | 65 | 75 | 84 |
| Wind speed (mph) | 6.8 | 6.9 | 7.5 | 8.2 | 8.1 | 8.2 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Sloulin Field International Airport, a weather station, about 3 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.