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Monthly climate in Groton, South Dakota, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Groton features a humid continental climate (Dfa).Temperatures typically range between -10 °C (14 °F) and 24 °C (75 °F) through the year, but rarely can drop to -38 °C (-36 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 642 mm (25.3 inches) and receives 81 rainy days on the 1 mm (0.04 inches) threshold annually.Groton enjoys an average of 3071 hours of sunshine throughout the year, and daylight varies from 8 hours 45 minutes to 15 hours 36 minutes per day.

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

The warmest months in Groton are June, July and August, with daily mean temperatures ranging from 21 to 24 °C (71 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -10 to -5 °C (14 - 23 °F) throughout the day. On average each year, Groton experiences 74 days above 25 °C (77.0 °F) and 154 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Groton, 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
(44°F)		 16°C
(61°F)		 25°C
(78°F)		 27°C
(81°F)		 36°C
(97°F)		 38°C
(101°F)		 37°C
(98°F)		 36°C
(97°F)		 34°C
(93°F)		 28°C
(83°F)		 23°C
(74°F)		 14°C
(58°F)
Mean maximum 5°C
(42°F)		 7°C
(45°F)		 16°C
(61°F)		 24°C
(75°F)		 30°C
(87°F)		 32°C
(89°F)		 35°C
(95°F)		 32°C
(91°F)		 32°C
(90°F)		 25°C
(77°F)		 16°C
(61°F)		 9°C
(49°F)
Average high -5°C
(22°F)		 -5°C
(23°F)		 4°C
(40°F)		 11°C
(51°F)		 20°C
(68°F)		 27°C
(82°F)		 29°C
(85°F)		 27°C
(80°F)		 23°C
(73°F)		 13°C
(55°F)		 5°C
(41°F)		 -1°C
(31°F)
Daily mean -10°C
(15°F)		 -10°C
(14°F)		 -1°C
(31°F)		 5°C
(41°F)		 14°C
(57°F)		 22°C
(71°F)		 24°C
(75°F)		 21°C
(71°F)		 17°C
(63°F)		 8°C
(46°F)		 0°C
(33°F)		 -5°C
(23°F)
Average low -14°C
(7°F)		 -15°C
(5°F)		 -5°C
(23°F)		 -0°C
(32°F)		 8°C
(47°F)		 15°C
(60°F)		 18°C
(65°F)		 16°C
(60°F)		 12°C
(53°F)		 3°C
(37°F)		 -4°C
(24°F)		 -9°C
(15°F)
Mean minimum -28°C
(-18°F)		 -28°C
(-17°F)		 -17°C
(1°F)		 -10°C
(14°F)		 -0°C
(31°F)		 9°C
(49°F)		 12°C
(54°F)		 9°C
(48°F)		 3°C
(37°F)		 -8°C
(17°F)		 -13°C
(9°F)		 -25°C
(-12°F)
Minimum -38°C
(-36°F)		 -32°C
(-25°F)		 -28°C
(-18°F)		 -20°C
(-4°F)		 -2°C
(29°F)		 6°C
(43°F)		 10°C
(50°F)		 8°C
(47°F)		 2°C
(36°F)		 -16°C
(4°F)		 -16°C
(4°F)		 -28°C
(-18°F)

Compare climate in Groton with other places

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

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

Groton usually has the most precipitation in July, August and September, with an average of 8 rainy days and 91 mm (3.6 inches) of precipitation per month.The driest months in Groton are January, February and November. On average, 17 mm (0.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Groton, 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) 18 (0.7) 16 (0.6) 35 (1.4) 47 (1.9) 64 (2.5) 65 (2.6) 76 (3.0) 108 (4.2) 88 (3.5) 76 (3.0) 17 (0.7) 33 (1.3)
Average precipitation days (≥ 1 mm) 5 4 5 8 10 8 9 9 8 7 3 5

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

The sunniest months in Groton are June, July and August, when the sun shines an average of 11 hours 32 minutes a day.Least sunny months in Groton: January, November and December receive an average of 5 hours 37 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Groton, 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 141 204 247 255 305 362 368 331 259 219 194 180
Mean daily daylight hours 9h 9m 10h 23m 11h 57m 13h 33m 14h 54m 15h 36m 15h 13m 14h 0m 12h 28m 10h 52m 9h 28m 8h 45m

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

Groton 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 Groton UV Index data.

Average daily maximum UV levels by month for Groton, 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 5 7 9 10 9 9 7 5 3 2