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Monthly climate in Castlewood, South Dakota, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Castlewood features a humid continental climate (Dfa).Temperatures typically range between -10 °C (15 °F) and 23 °C (73 °F) through the year, but rarely can drop to -36 °C (-33 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 741 mm (29.2 inches) and receives 92 rainy days on the 1 mm (0.04 inches) threshold annually.Castlewood enjoys an average of 3057 hours of sunshine throughout the year, and daylight varies from 8 hours 50 minutes to 15 hours 30 minutes per day.

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

The warmest months in Castlewood are June, July and August, with daily mean temperatures ranging from 21 to 23 °C (70 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -10 to -5 °C (15 - 24 °F) throughout the day. On average each year, Castlewood experiences 65 days above 25 °C (77.0 °F) and 155 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castlewood, 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 7°C
(45°F)		 16°C
(61°F)		 25°C
(77°F)		 28°C
(82°F)		 33°C
(91°F)		 36°C
(97°F)		 35°C
(96°F)		 33°C
(91°F)		 32°C
(90°F)		 28°C
(82°F)		 25°C
(77°F)		 13°C
(56°F)
Mean maximum 5°C
(41°F)		 7°C
(46°F)		 17°C
(62°F)		 24°C
(76°F)		 29°C
(85°F)		 30°C
(87°F)		 33°C
(92°F)		 31°C
(88°F)		 31°C
(87°F)		 25°C
(78°F)		 16°C
(62°F)		 9°C
(49°F)
Average high -5°C
(23°F)		 -5°C
(24°F)		 4°C
(39°F)		 10°C
(50°F)		 19°C
(66°F)		 26°C
(79°F)		 28°C
(82°F)		 26°C
(79°F)		 22°C
(72°F)		 12°C
(54°F)		 5°C
(41°F)		 -1°C
(31°F)
Daily mean -10°C
(15°F)		 -10°C
(15°F)		 -1°C
(31°F)		 5°C
(41°F)		 13°C
(56°F)		 21°C
(70°F)		 23°C
(73°F)		 21°C
(70°F)		 17°C
(63°F)		 7°C
(46°F)		 0°C
(33°F)		 -5°C
(24°F)
Average low -14°C
(7°F)		 -14°C
(6°F)		 -5°C
(23°F)		 -0°C
(32°F)		 8°C
(47°F)		 15°C
(60°F)		 18°C
(64°F)		 16°C
(60°F)		 12°C
(54°F)		 3°C
(38°F)		 -4°C
(25°F)		 -9°C
(17°F)
Mean minimum -28°C
(-18°F)		 -27°C
(-16°F)		 -17°C
(2°F)		 -10°C
(15°F)		 -0°C
(32°F)		 9°C
(49°F)		 12°C
(54°F)		 10°C
(50°F)		 3°C
(38°F)		 -7°C
(19°F)		 -13°C
(10°F)		 -22°C
(-8°F)
Minimum -36°C
(-33°F)		 -33°C
(-27°F)		 -28°C
(-19°F)		 -18°C
(-1°F)		 -2°C
(29°F)		 6°C
(43°F)		 10°C
(49°F)		 8°C
(47°F)		 2°C
(35°F)		 -12°C
(10°F)		 -16°C
(4°F)		 -26°C
(-14°F)

Compare climate in Castlewood with other places

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

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

Castlewood usually has the most precipitation in May, August and September, with an average of 10 rainy days and 96 mm (3.8 inches) of precipitation per month.The driest months in Castlewood are January, February and November. On average, 22 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castlewood, 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 (0.9) 18 (0.7) 50 (2.0) 68 (2.7) 89 (3.5) 79 (3.1) 83 (3.3) 109 (4.3) 88 (3.5) 77 (3.0) 26 (1.0) 31 (1.2)
Average precipitation days (≥ 1 mm) 4 4 6 10 11 10 9 10 9 9 5 5

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

The sunniest months in Castlewood are June, July and August, when the sun shines an average of 11 hours 28 minutes a day.Least sunny months in Castlewood: January, November and December receive an average of 5 hours 42 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castlewood, 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 141 204 237 257 301 355 367 331 256 220 196 187
Mean daily daylight hours 9h 14m 10h 26m 11h 57m 13h 31m 14h 50m 15h 30m 15h 8m 13h 57m 12h 27m 10h 54m 9h 32m 8h 50m

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

Castlewood experiences the highest level of ultraviolet (UV) radiation in May, June 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 Castlewood UV Index data.

Average daily maximum UV levels by month for Castlewood, 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 8 9 10 9 9 8 5 3 2