nomadseason

Monthly climate in Spearfish, South Dakota, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Spearfish features a humid continental climate (Dfb).Temperatures typically range between -6 °C (21 °F) and 22 °C (72 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 39 °C (103 °F).The average annual precipitation amounts to about 636 mm (25.0 inches) and receives 111 rainy days on the 1 mm (0.04 inches) threshold annually.Spearfish enjoys an average of 3260 hours of sunshine throughout the year, and daylight varies from 8 hours 52 minutes to 15 hours 28 minutes per day.

Monthly average temperatures in Spearfish, South Dakota, United States §

The warmest months in Spearfish are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (66 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -1 °C (21 - 30 °F) throughout the day. On average each year, Spearfish experiences 68 days above 25 °C (77.0 °F) and 149 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Spearfish, 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 14°C
(57°F)		 18°C
(65°F)		 21°C
(69°F)		 26°C
(79°F)		 31°C
(88°F)		 37°C
(99°F)		 39°C
(103°F)		 37°C
(99°F)		 37°C
(100°F)		 31°C
(88°F)		 24°C
(76°F)		 21°C
(70°F)
Mean maximum 12°C
(53°F)		 13°C
(56°F)		 19°C
(66°F)		 24°C
(75°F)		 29°C
(84°F)		 31°C
(88°F)		 35°C
(96°F)		 35°C
(95°F)		 33°C
(92°F)		 27°C
(80°F)		 20°C
(68°F)		 15°C
(60°F)
Average high 2°C
(36°F)		 -0°C
(31°F)		 8°C
(46°F)		 11°C
(52°F)		 17°C
(63°F)		 25°C
(78°F)		 29°C
(84°F)		 27°C
(81°F)		 23°C
(73°F)		 13°C
(55°F)		 8°C
(47°F)		 4°C
(39°F)
Daily mean -3°C
(26°F)		 -6°C
(21°F)		 2°C
(35°F)		 5°C
(41°F)		 11°C
(52°F)		 19°C
(66°F)		 22°C
(72°F)		 20°C
(69°F)		 16°C
(61°F)		 7°C
(44°F)		 3°C
(37°F)		 -1°C
(30°F)
Average low -8°C
(18°F)		 -11°C
(12°F)		 -4°C
(26°F)		 -1°C
(30°F)		 5°C
(42°F)		 12°C
(54°F)		 15°C
(60°F)		 13°C
(56°F)		 9°C
(49°F)		 1°C
(34°F)		 -3°C
(27°F)		 -6°C
(22°F)
Mean minimum -23°C
(-10°F)		 -24°C
(-11°F)		 -14°C
(6°F)		 -11°C
(12°F)		 -2°C
(30°F)		 6°C
(43°F)		 10°C
(51°F)		 7°C
(46°F)		 1°C
(35°F)		 -11°C
(13°F)		 -13°C
(9°F)		 -16°C
(3°F)
Minimum -30°C
(-22°F)		 -29°C
(-19°F)		 -26°C
(-14°F)		 -18°C
(-0°F)		 -4°C
(26°F)		 4°C
(40°F)		 9°C
(49°F)		 5°C
(42°F)		 -3°C
(27°F)		 -21°C
(-5°F)		 -19°C
(-2°F)		 -24°C
(-12°F)

Compare climate in Spearfish with other places

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

Monthly average precipitation in Spearfish, South Dakota, United States §

Spearfish usually has the most precipitation in April, May and July, with an average of 12 rainy days and 87 mm (3.4 inches) of precipitation per month.The driest months in Spearfish are January, November and December. On average, 24 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Spearfish, 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) 22 (0.8) 33 (1.3) 39 (1.5) 74 (2.9) 98 (3.9) 65 (2.6) 88 (3.4) 58 (2.3) 43 (1.7) 65 (2.5) 21 (0.8) 31 (1.2)
Average precipitation days (≥ 1 mm) 6 9 9 11 15 11 12 8 7 9 7 7

Monthly sunshine hours in Spearfish, South Dakota, United States §

The sunniest months in Spearfish are June, July and August, when the sun shines an average of 12 hours 6 minutes a day.Least sunny months in Spearfish: January, February and December receive an average of 6 hours 15 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Spearfish, 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 163 207 256 276 301 375 382 356 288 236 215 198
Mean daily daylight hours 9h 15m 10h 27m 11h 57m 13h 30m 14h 49m 15h 28m 15h 6m 13h 56m 12h 27m 10h 55m 9h 34m 8h 52m

Solar UV radiation in Spearfish, South Dakota, United States §

Spearfish experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme 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 Spearfish UV Index data.

Average daily maximum UV levels by month for Spearfish, 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) 3 4 6 9 9 11 11 10 8 5 3 2