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Monthly climate in Williston, North Dakota, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Williston features a cold semi-arid climate (BSk).Temperatures typically range between -12 °C (11 °F) and 22 °C (71 °F) through the year, but rarely can drop to -40 °C (-39 °F) or can rise to as high as 39 °C (102 °F).The average annual precipitation amounts to about 426 mm (16.8 inches) and receives 71 rainy days on the 1 mm (0.04 inches) threshold annually.Williston enjoys an average of 3128 hours of sunshine throughout the year, and daylight varies from 8 hours 24 minutes to 15 hours 59 minutes per day.

Monthly average temperatures in Williston, North Dakota, United States §

The warmest months in Williston are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (66 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -12 to -7 °C (11 - 20 °F) throughout the day. On average each year, Williston experiences 63 days above 25 °C (77.0 °F) and 167 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Williston, North Dakota, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 9°C
(48°F)		 12°C
(55°F)		 20°C
(67°F)		 25°C
(78°F)		 32°C
(91°F)		 35°C
(96°F)		 38°C
(100°F)		 39°C
(102°F)		 34°C
(93°F)		 32°C
(90°F)		 22°C
(72°F)		 11°C
(52°F)
Mean maximum 6°C
(43°F)		 8°C
(46°F)		 15°C
(60°F)		 23°C
(73°F)		 29°C
(85°F)		 30°C
(87°F)		 34°C
(94°F)		 35°C
(96°F)		 32°C
(89°F)		 25°C
(78°F)		 15°C
(60°F)		 8°C
(47°F)
Average high -6°C
(22°F)		 -7°C
(20°F)		 3°C
(39°F)		 9°C
(49°F)		 19°C
(66°F)		 25°C
(77°F)		 28°C
(83°F)		 27°C
(81°F)		 21°C
(70°F)		 11°C
(53°F)		 3°C
(37°F)		 -2°C
(28°F)
Daily mean -10°C
(14°F)		 -12°C
(11°F)		 -2°C
(28°F)		 3°C
(38°F)		 12°C
(55°F)		 19°C
(66°F)		 22°C
(71°F)		 20°C
(68°F)		 15°C
(58°F)		 5°C
(42°F)		 -2°C
(29°F)		 -7°C
(20°F)
Average low -15°C
(6°F)		 -17°C
(2°F)		 -7°C
(20°F)		 -2°C
(28°F)		 6°C
(43°F)		 12°C
(55°F)		 15°C
(59°F)		 13°C
(55°F)		 8°C
(47°F)		 0°C
(33°F)		 -6°C
(21°F)		 -12°C
(12°F)
Mean minimum -33°C
(-26°F)		 -31°C
(-23°F)		 -20°C
(-5°F)		 -14°C
(7°F)		 -2°C
(28°F)		 6°C
(44°F)		 10°C
(50°F)		 7°C
(45°F)		 1°C
(34°F)		 -9°C
(16°F)		 -17°C
(3°F)		 -26°C
(-15°F)
Minimum -38°C
(-36°F)		 -40°C
(-39°F)		 -28°C
(-19°F)		 -21°C
(-5°F)		 -7°C
(20°F)		 4°C
(39°F)		 8°C
(47°F)		 6°C
(43°F)		 -4°C
(26°F)		 -16°C
(4°F)		 -18°C
(-0°F)		 -36°C
(-33°F)

Compare climate in Williston with other places

Compare temperature, precipitation, sunshine, UV index in Williston, North Dakota, United States with other places around the world.

Monthly average precipitation in Williston, North Dakota, United States §

Williston usually has the most precipitation in June, July and September, with an average of 6 rainy days and 64 mm (2.5 inches) of precipitation per month.The driest months in Williston are January, February and November. On average, 16 mm (0.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Williston, North Dakota, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 11 (0.4) 18 (0.7) 23 (0.9) 28 (1.1) 45 (1.8) 74 (2.9) 58 (2.3) 44 (1.7) 59 (2.3) 30 (1.2) 19 (0.7) 19 (0.8)
Average precipitation days (≥ 1 mm) 3 4 5 5 8 9 6 7 5 7 7 5

Monthly sunshine hours in Williston, North Dakota, United States §

The sunniest months in Williston are June, July and August, when the sun shines an average of 11 hours 52 minutes a day.Least sunny months in Williston: January, November and December receive an average of 5 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Williston, North Dakota, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 145 200 251 280 333 370 386 335 258 222 176 166
Mean daily daylight hours 8h 51m 10h 13m 11h 56m 13h 42m 15h 13m 15h 59m 15h 33m 14h 12m 12h 30m 10h 45m 9h 12m 8h 24m

Solar UV radiation in Williston, North Dakota, United States §

Williston experiences the highest level of ultraviolet (UV) radiation in April, June and July, when the maximum UV index can reach values of 9 - 9, which corresponds to the Very High category of sun exposure.January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Williston UV Index data.

Average daily maximum UV levels by month for Williston, North Dakota, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 4 5 9 8 9 9 8 7 5 2 2