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Monthly climate in Custer, South Dakota, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Custer features a humid continental climate (Dfb).Temperatures typically range between -6 °C (21 °F) and 20 °C (69 °F) through the year, but rarely can drop to -33 °C (-27 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 720 mm (28.4 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually.Custer enjoys an average of 3342 hours of sunshine throughout the year, and daylight varies from 8 hours 57 minutes to 15 hours 23 minutes per day.

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

The warmest months in Custer are June, July and August, with daily mean temperatures ranging from 18 to 20 °C (64 - 69 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -2 °C (21 - 29 °F) throughout the day. On average each year, Custer experiences 56 days above 25 °C (77.0 °F) and 166 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Custer, 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 15°C
(59°F)		 17°C
(63°F)		 22°C
(72°F)		 25°C
(77°F)		 29°C
(85°F)		 34°C
(94°F)		 35°C
(96°F)		 34°C
(94°F)		 36°C
(97°F)		 28°C
(82°F)		 24°C
(75°F)		 19°C
(67°F)
Mean maximum 12°C
(53°F)		 12°C
(55°F)		 19°C
(66°F)		 23°C
(74°F)		 27°C
(81°F)		 29°C
(84°F)		 33°C
(92°F)		 32°C
(90°F)		 32°C
(90°F)		 24°C
(76°F)		 18°C
(66°F)		 15°C
(59°F)
Average high 2°C
(36°F)		 -0°C
(32°F)		 7°C
(46°F)		 11°C
(52°F)		 16°C
(60°F)		 24°C
(75°F)		 27°C
(81°F)		 26°C
(79°F)		 22°C
(72°F)		 12°C
(54°F)		 8°C
(46°F)		 3°C
(38°F)
Daily mean -3°C
(26°F)		 -6°C
(21°F)		 1°C
(34°F)		 4°C
(39°F)		 10°C
(50°F)		 18°C
(64°F)		 20°C
(69°F)		 19°C
(66°F)		 15°C
(59°F)		 6°C
(43°F)		 2°C
(36°F)		 -2°C
(29°F)
Average low -8°C
(18°F)		 -12°C
(11°F)		 -5°C
(24°F)		 -3°C
(27°F)		 4°C
(39°F)		 11°C
(52°F)		 14°C
(57°F)		 12°C
(54°F)		 8°C
(47°F)		 -0°C
(32°F)		 -3°C
(26°F)		 -6°C
(21°F)
Mean minimum -23°C
(-9°F)		 -27°C
(-16°F)		 -17°C
(2°F)		 -14°C
(7°F)		 -4°C
(25°F)		 5°C
(41°F)		 8°C
(47°F)		 6°C
(43°F)		 -1°C
(31°F)		 -12°C
(10°F)		 -14°C
(8°F)		 -17°C
(2°F)
Minimum -28°C
(-18°F)		 -33°C
(-27°F)		 -29°C
(-21°F)		 -23°C
(-10°F)		 -7°C
(19°F)		 3°C
(38°F)		 7°C
(45°F)		 4°C
(40°F)		 -9°C
(16°F)		 -21°C
(-5°F)		 -21°C
(-5°F)		 -25°C
(-13°F)

Compare climate in Custer with other places

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

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

Custer usually has the most precipitation in May, June and July, with an average of 16 rainy days and 104 mm (4.1 inches) of precipitation per month.The driest months in Custer are January, November and December. On average, 22 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Custer, 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) 15 (0.6) 32 (1.3) 48 (1.9) 84 (3.3) 112 (4.4) 88 (3.4) 114 (4.5) 76 (3.0) 49 (1.9) 53 (2.1) 23 (0.9) 27 (1.1)
Average precipitation days (≥ 1 mm) 5 7 8 12 18 14 16 13 8 8 6 6

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

The sunniest months in Custer are June, July and August, when the sun shines an average of 12 hours 6 minutes a day.Least sunny months in Custer: January, February and December receive an average of 6 hours 34 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Custer, 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 170 217 266 287 304 374 383 355 289 251 230 210
Mean daily daylight hours 9h 19m 10h 29m 11h 58m 13h 28m 14h 44m 15h 23m 15h 2m 13h 53m 12h 26m 10h 56m 9h 38m 8h 57m

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

Custer 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 Custer UV Index data.

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