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Monthly climate in Oconomowoc, Wisconsin, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Oconomowoc features a humid continental climate (Dfb). Temperatures typically range between -6 °C (22 °F) and 24 °C (75 °F) through the year, but rarely can drop to -33 °C (-27 °F) or can rise to as high as 35 °C (95 °F). The average annual precipitation amounts to about 1003 mm (39.5 inches) and receives 120 rainy days on the 1 mm (0.04 inches) threshold annually. Oconomowoc enjoys an average of 2911 hours of sunshine throughout the year, and daylight varies from 9 hours 3 minutes to 15 hours 16 minutes per day.

Monthly average temperatures in Oconomowoc, Wisconsin, United States §

The warmest months in Oconomowoc 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, Oconomowoc 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 Oconomowoc, 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 13°C
(56°F)		 20°C
(69°F)		 23°C
(73°F)		 28°C
(82°F)		 35°C
(95°F)		 34°C
(94°F)		 35°C
(95°F)		 34°C
(93°F)		 34°C
(93°F)		 30°C
(86°F)		 24°C
(76°F)		 19°C
(66°F)
Mean maximum 9°C
(48°F)		 12°C
(54°F)		 18°C
(65°F)		 25°C
(78°F)		 31°C
(88°F)		 33°C
(91°F)		 34°C
(93°F)		 32°C
(89°F)		 30°C
(87°F)		 28°C
(83°F)		 17°C
(63°F)		 14°C
(58°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
(81°F)		 24°C
(75°F)		 16°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
(66°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
(38°F)		 10°C
(51°F)		 16°C
(61°F)		 19°C
(66°F)		 17°C
(63°F)		 14°C
(57°F)		 7°C
(45°F)		 -1°C
(30°F)		 -5°C
(24°F)
Mean minimum -24°C
(-11°F)		 -25°C
(-12°F)		 -16°C
(4°F)		 -5°C
(24°F)		 1°C
(35°F)		 11°C
(53°F)		 13°C
(56°F)		 11°C
(52°F)		 6°C
(44°F)		 -2°C
(28°F)		 -10°C
(14°F)		 -15°C
(5°F)
Minimum -32°C
(-25°F)		 -33°C
(-27°F)		 -24°C
(-11°F)		 -9°C
(17°F)		 -1°C
(31°F)		 8°C
(46°F)		 12°C
(54°F)		 8°C
(47°F)		 2°C
(36°F)		 -4°C
(24°F)		 -16°C
(4°F)		 -22°C
(-8°F)

Compare climate in Oconomowoc with other places

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

Monthly average precipitation in Oconomowoc, Wisconsin, United States §

Oconomowoc usually has the most precipitation in May, June and October, with an average of 12 rainy days and 118 mm (4.6 inches) of precipitation per month. The driest months in Oconomowoc are February, November and December. On average, 48 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Oconomowoc, 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) 56 (2.2) 51 (2.0) 60 (2.4) 108 (4.3) 129 (5.1) 111 (4.4) 99 (3.9) 86 (3.4) 97 (3.8) 113 (4.5) 46 (1.8) 46 (1.8)
Average precipitation days (≥ 1 mm) 7 9 9 13 13 12 9 11 9 13 8 7

Monthly sunshine hours in Oconomowoc, Wisconsin, United States §

The sunniest months in Oconomowoc are June, July and August, when the sun shines an average of 11 hours 3 minutes a day. Least sunny months in Oconomowoc: January, November and December receive an average of 5 hours 7 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Oconomowoc, 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 122 188 235 244 278 322 359 334 272 202 183 166
Mean daily daylight hours 9h 25m 10h 32m 11h 58m 13h 25m 14h 39m 15h 16m 14h 56m 13h 50m 12h 26m 10h 59m 9h 42m 9h 3m

Solar UV radiation in Oconomowoc, Wisconsin, United States §

Oconomowoc 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 Oconomowoc UV Index data.

Average daily maximum UV levels by month for Oconomowoc, 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 7 5 3 2

Detailed Monthly Weather Insights for Oconomowoc, Wisconsin, United States

Discover in-depth weather details for every month in Oconomowoc. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Oconomowoc's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.