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Monthly climate in Fort Thompson, South Dakota, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Fort Thompson features a humid continental climate (Dfa).Temperatures typically range between -7 °C (19 °F) and 25 °C (78 °F) through the year, but rarely can drop to -35 °C (-30 °F) or can rise to as high as 40 °C (104 °F).The average annual precipitation amounts to about 589 mm (23.2 inches) and receives 81 rainy days on the 1 mm (0.04 inches) threshold annually.Fort Thompson enjoys an average of 3166 hours of sunshine throughout the year, and daylight varies from 8 hours 55 minutes to 15 hours 25 minutes per day.

Monthly average temperatures in Fort Thompson, South Dakota, United States §

The warmest months in Fort Thompson are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (73 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -7 to -3 °C (19 - 26 °F) throughout the day. On average each year, Fort Thompson experiences 92 days above 25 °C (77.0 °F) and 144 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Fort Thompson, South 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 12°C
(53°F)		 21°C
(70°F)		 25°C
(78°F)		 30°C
(86°F)		 35°C
(95°F)		 38°C
(101°F)		 40°C
(104°F)		 37°C
(98°F)		 35°C
(95°F)		 29°C
(85°F)		 26°C
(80°F)		 19°C
(66°F)
Mean maximum 8°C
(47°F)		 13°C
(55°F)		 20°C
(68°F)		 27°C
(81°F)		 30°C
(87°F)		 33°C
(91°F)		 37°C
(100°F)		 34°C
(94°F)		 34°C
(93°F)		 27°C
(81°F)		 20°C
(67°F)		 13°C
(55°F)
Average high -2°C
(29°F)		 -2°C
(29°F)		 7°C
(45°F)		 13°C
(55°F)		 20°C
(69°F)		 29°C
(84°F)		 31°C
(88°F)		 29°C
(85°F)		 25°C
(78°F)		 14°C
(58°F)		 8°C
(47°F)		 2°C
(36°F)
Daily mean -7°C
(20°F)		 -7°C
(19°F)		 1°C
(35°F)		 7°C
(44°F)		 15°C
(59°F)		 23°C
(73°F)		 25°C
(78°F)		 23°C
(74°F)		 19°C
(66°F)		 9°C
(48°F)		 2°C
(36°F)		 -3°C
(26°F)
Average low -12°C
(11°F)		 -13°C
(9°F)		 -4°C
(25°F)		 1°C
(33°F)		 9°C
(49°F)		 17°C
(62°F)		 19°C
(67°F)		 17°C
(63°F)		 13°C
(56°F)		 3°C
(38°F)		 -3°C
(26°F)		 -8°C
(18°F)
Mean minimum -26°C
(-15°F)		 -27°C
(-16°F)		 -16°C
(4°F)		 -9°C
(17°F)		 1°C
(35°F)		 11°C
(52°F)		 14°C
(57°F)		 11°C
(52°F)		 5°C
(41°F)		 -8°C
(18°F)		 -12°C
(11°F)		 -20°C
(-3°F)
Minimum -35°C
(-30°F)		 -31°C
(-24°F)		 -25°C
(-13°F)		 -15°C
(6°F)		 -2°C
(28°F)		 8°C
(46°F)		 10°C
(51°F)		 9°C
(49°F)		 4°C
(39°F)		 -14°C
(7°F)		 -15°C
(5°F)		 -26°C
(-14°F)

Compare climate in Fort Thompson with other places

Compare temperature, precipitation, sunshine, UV index in Fort Thompson, South Dakota, United States with other places around the world.

Monthly average precipitation in Fort Thompson, South Dakota, United States §

Fort Thompson usually has the most precipitation in May, June and July, with an average of 9 rainy days and 77 mm (3.0 inches) of precipitation per month.The driest months in Fort Thompson 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 Fort Thompson, South 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) 17 (0.7) 20 (0.8) 44 (1.7) 57 (2.2) 79 (3.1) 76 (3.0) 77 (3.0) 56 (2.2) 66 (2.6) 56 (2.2) 13 (0.5) 29 (1.2)
Average precipitation days (≥ 1 mm) 3 6 6 7 10 8 10 8 7 8 4 4

Monthly sunshine hours in Fort Thompson, South Dakota, United States §

The sunniest months in Fort Thompson are June, July and August, when the sun shines an average of 11 hours 42 minutes a day.Least sunny months in Fort Thompson: January, February and December receive an average of 6 hours 9 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fort Thompson, South 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 157 206 241 270 293 361 373 342 270 235 217 196
Mean daily daylight hours 9h 18m 10h 28m 11h 57m 13h 29m 14h 46m 15h 25m 15h 4m 13h 54m 12h 26m 10h 56m 9h 36m 8h 55m

Solar UV radiation in Fort Thompson, South Dakota, United States §

Fort Thompson experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Fort Thompson UV Index data.

Average daily maximum UV levels by month for Fort Thompson, South 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 5 5 7 9 10 10 9 8 5 3 2