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Monthly climate in Watertown, South Dakota, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Watertown features a humid continental climate (Dfa).Temperatures typically range between -10 °C (14 °F) and 23 °C (73 °F) through the year, but rarely can drop to -36 °C (-32 °F) or can rise to as high as 37 °C (98 °F).The average annual precipitation amounts to about 742 mm (29.2 inches) and receives 91 rainy days on the 1 mm (0.04 inches) threshold annually.Watertown enjoys an average of 3030 hours of sunshine throughout the year, and daylight varies from 8 hours 49 minutes to 15 hours 31 minutes per day.

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

The warmest months in Watertown 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 (14 - 23 °F) throughout the day. On average each year, Watertown experiences 65 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 Watertown, 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
(77°F)		 28°C
(82°F)		 34°C
(93°F)		 37°C
(98°F)		 36°C
(97°F)		 33°C
(92°F)		 32°C
(91°F)		 28°C
(82°F)		 25°C
(77°F)		 13°C
(56°F)
Mean maximum 5°C
(40°F)		 7°C
(45°F)		 16°C
(61°F)		 24°C
(76°F)		 29°C
(85°F)		 30°C
(87°F)		 34°C
(93°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
(22°F)		 -5°C
(23°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
(14°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
(62°F)		 7°C
(46°F)		 0°C
(33°F)		 -5°C
(23°F)
Average low -14°C
(7°F)		 -15°C
(6°F)		 -5°C
(23°F)		 -0°C
(32°F)		 8°C
(47°F)		 15°C
(60°F)		 18°C
(64°F)		 15°C
(60°F)		 12°C
(53°F)		 3°C
(37°F)		 -4°C
(25°F)		 -9°C
(16°F)
Mean minimum -27°C
(-17°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)		 9°C
(49°F)		 3°C
(38°F)		 -7°C
(19°F)		 -13°C
(9°F)		 -23°C
(-9°F)
Minimum -36°C
(-32°F)		 -33°C
(-27°F)		 -28°C
(-18°F)		 -17°C
(2°F)		 -2°C
(29°F)		 7°C
(44°F)		 10°C
(50°F)		 8°C
(47°F)		 1°C
(35°F)		 -12°C
(10°F)		 -16°C
(3°F)		 -26°C
(-15°F)

Compare climate in Watertown with other places

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

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

Watertown usually has the most precipitation in May, June and August, with an average of 10 rainy days and 96 mm (3.8 inches) of precipitation per month.The driest months in Watertown are January, February and November. On average, 21 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Watertown, 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) 17 (0.7) 48 (1.9) 65 (2.6) 90 (3.6) 84 (3.3) 81 (3.2) 113 (4.4) 84 (3.3) 80 (3.1) 25 (1.0) 33 (1.3)
Average precipitation days (≥ 1 mm) 5 5 6 9 11 9 9 10 9 9 4 5

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

The sunniest months in Watertown are June, July and August, when the sun shines an average of 11 hours 25 minutes a day.Least sunny months in Watertown: January, November and December receive an average of 5 hours 34 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Watertown, 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 140 202 240 251 301 355 365 329 252 217 191 181
Mean daily daylight hours 9h 13m 10h 25m 11h 57m 13h 31m 14h 51m 15h 31m 15h 9m 13h 58m 12h 27m 10h 54m 9h 31m 8h 49m

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

Watertown 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 Watertown UV Index data.

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