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Monthly climate in Jefferson, Wisconsin, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Jefferson features a humid continental climate (Dfa).Temperatures typically range between -6 °C (22 °F) and 24 °C (75 °F) through the year, but rarely can drop to -32 °C (-25 °F) or can rise to as high as 34 °C (94 °F).The average annual precipitation amounts to about 1000 mm (39.4 inches) and receives 124 rainy days on the 1 mm (0.04 inches) threshold annually.Jefferson enjoys an average of 2878 hours of sunshine throughout the year, and daylight varies from 9 hours 2 minutes to 15 hours 17 minutes per day.

Monthly average temperatures in Jefferson, Wisconsin, United States §

The warmest months in Jefferson are June, July and August, with daily mean temperatures ranging from 21 to 24 °C (70 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -1 °C (22 - 30 °F) throughout the day. On average each year, Jefferson experiences 76 days above 25 °C (77.0 °F) and 124 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Jefferson, Wisconsin, 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 12°C
(54°F)		 20°C
(68°F)		 22°C
(73°F)		 27°C
(81°F)		 34°C
(93°F)		 33°C
(93°F)		 34°C
(94°F)		 33°C
(92°F)		 33°C
(92°F)		 30°C
(85°F)		 24°C
(75°F)		 18°C
(65°F)
Mean maximum 8°C
(47°F)		 12°C
(54°F)		 18°C
(64°F)		 25°C
(77°F)		 31°C
(87°F)		 32°C
(90°F)		 33°C
(92°F)		 31°C
(89°F)		 30°C
(87°F)		 28°C
(83°F)		 17°C
(63°F)		 14°C
(57°F)
Average high -2°C
(29°F)		 -0°C
(32°F)		 7°C
(45°F)		 13°C
(55°F)		 20°C
(68°F)		 26°C
(79°F)		 28°C
(83°F)		 27°C
(80°F)		 23°C
(75°F)		 15°C
(60°F)		 6°C
(44°F)		 2°C
(36°F)
Daily mean -6°C
(22°F)		 -5°C
(24°F)		 2°C
(36°F)		 8°C
(46°F)		 15°C
(59°F)		 21°C
(70°F)		 24°C
(75°F)		 22°C
(72°F)		 18°C
(65°F)		 11°C
(52°F)		 3°C
(37°F)		 -1°C
(30°F)
Average low -10°C
(15°F)		 -10°C
(15°F)		 -2°C
(28°F)		 3°C
(37°F)		 10°C
(51°F)		 16°C
(61°F)		 19°C
(66°F)		 17°C
(63°F)		 13°C
(57°F)		 7°C
(44°F)		 -1°C
(30°F)		 -5°C
(24°F)
Mean minimum -24°C
(-11°F)		 -24°C
(-10°F)		 -15°C
(5°F)		 -5°C
(24°F)		 1°C
(35°F)		 11°C
(52°F)		 13°C
(56°F)		 11°C
(52°F)		 6°C
(43°F)		 -3°C
(28°F)		 -10°C
(14°F)		 -15°C
(5°F)
Minimum -32°C
(-25°F)		 -32°C
(-25°F)		 -24°C
(-11°F)		 -8°C
(17°F)		 -1°C
(30°F)		 8°C
(46°F)		 12°C
(54°F)		 8°C
(46°F)		 2°C
(36°F)		 -5°C
(23°F)		 -16°C
(4°F)		 -22°C
(-7°F)

Compare climate in Jefferson with other places

Compare temperature, precipitation, sunshine, UV index in Jefferson, Wisconsin, United States with other places around the world.

Monthly average precipitation in Jefferson, Wisconsin, United States §

Jefferson usually has the most precipitation in May, June and October, with an average of 13 rainy days and 117 mm (4.6 inches) of precipitation per month.The driest months in Jefferson are February, November and December. On average, 47 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Jefferson, Wisconsin, 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) 55 (2.1) 51 (2.0) 58 (2.3) 105 (4.1) 127 (5.0) 112 (4.4) 96 (3.8) 90 (3.5) 102 (4.0) 113 (4.5) 44 (1.7) 47 (1.8)
Average precipitation days (≥ 1 mm) 7 9 9 13 14 13 11 11 9 13 8 7

Monthly sunshine hours in Jefferson, Wisconsin, United States §

The sunniest months in Jefferson are June, July and August, when the sun shines an average of 10 hours 55 minutes a day.Least sunny months in Jefferson: January, November and December receive an average of 5 hours 11 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Jefferson, Wisconsin, 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 124 191 231 237 269 319 354 330 266 199 183 170
Mean daily daylight hours 9h 24m 10h 32m 11h 57m 13h 26m 14h 40m 15h 17m 14h 57m 13h 50m 12h 26m 10h 58m 9h 41m 9h 2m

Solar UV radiation in Jefferson, Wisconsin, United States §

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

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