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Monthly climate in Williams Bay, Wisconsin, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Williams Bay features a humid continental climate (Dfa). Temperatures typically range between -5 °C (23 °F) and 24 °C (75 °F) through the year, but rarely can drop to -33 °C (-28 °F) or can rise to as high as 34 °C (94 °F). The average annual precipitation amounts to about 1063 mm (41.8 inches) and receives 125 rainy days on the 1 mm (0.04 inches) threshold annually. Williams Bay enjoys an average of 2936 hours of sunshine throughout the year, and daylight varies from 9 hours 6 minutes to 15 hours 13 minutes per day.

Monthly average temperatures in Williams Bay, Wisconsin, United States §

The warmest months in Williams Bay 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 -5 to -1 °C (23 - 31 °F) throughout the day. On average each year, Williams Bay experiences 79 days above 25 °C (77.0 °F) and 120 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Williams Bay, 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 14°C
(57°F)		 20°C
(67°F)		 24°C
(75°F)		 27°C
(81°F)		 34°C
(93°F)		 34°C
(94°F)		 34°C
(93°F)		 34°C
(93°F)		 33°C
(92°F)		 30°C
(86°F)		 24°C
(75°F)		 19°C
(66°F)
Mean maximum 9°C
(49°F)		 12°C
(55°F)		 19°C
(67°F)		 25°C
(78°F)		 31°C
(87°F)		 32°C
(90°F)		 33°C
(92°F)		 32°C
(90°F)		 31°C
(88°F)		 28°C
(83°F)		 17°C
(63°F)		 14°C
(58°F)
Average high -2°C
(29°F)		 0°C
(33°F)		 8°C
(46°F)		 13°C
(56°F)		 20°C
(69°F)		 26°C
(79°F)		 28°C
(83°F)		 27°C
(81°F)		 24°C
(75°F)		 16°C
(61°F)		 7°C
(44°F)		 3°C
(38°F)
Daily mean -5°C
(23°F)		 -4°C
(25°F)		 3°C
(37°F)		 8°C
(47°F)		 15°C
(60°F)		 21°C
(71°F)		 24°C
(75°F)		 22°C
(72°F)		 19°C
(66°F)		 11°C
(53°F)		 3°C
(37°F)		 -1°C
(31°F)
Average low -9°C
(16°F)		 -9°C
(16°F)		 -2°C
(29°F)		 3°C
(38°F)		 10°C
(51°F)		 16°C
(62°F)		 19°C
(66°F)		 17°C
(63°F)		 14°C
(57°F)		 7°C
(45°F)		 -1°C
(30°F)		 -4°C
(24°F)
Mean minimum -24°C
(-11°F)		 -24°C
(-12°F)		 -14°C
(7°F)		 -5°C
(24°F)		 2°C
(35°F)		 12°C
(53°F)		 14°C
(57°F)		 11°C
(52°F)		 7°C
(44°F)		 -2°C
(29°F)		 -11°C
(13°F)		 -14°C
(6°F)
Minimum -32°C
(-25°F)		 -33°C
(-28°F)		 -22°C
(-8°F)		 -8°C
(17°F)		 -1°C
(30°F)		 9°C
(48°F)		 12°C
(54°F)		 8°C
(47°F)		 2°C
(37°F)		 -5°C
(23°F)		 -16°C
(4°F)		 -22°C
(-7°F)

Compare climate in Williams Bay with other places

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

Monthly average precipitation in Williams Bay, Wisconsin, United States §

Williams Bay usually has the most precipitation in May, June and October, with an average of 13 rainy days and 129 mm (5.1 inches) of precipitation per month. The driest months in Williams Bay are February, November and December. On average, 53 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Williams Bay, 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) 61 (2.4) 58 (2.3) 66 (2.6) 110 (4.3) 154 (6.0) 115 (4.5) 84 (3.3) 91 (3.6) 104 (4.1) 119 (4.7) 49 (1.9) 52 (2.1)
Average precipitation days (≥ 1 mm) 8 9 10 14 14 13 10 11 9 13 7 7

Monthly sunshine hours in Williams Bay, Wisconsin, United States §

The sunniest months in Williams Bay are June, July and August, when the sun shines an average of 11 hours 6 minutes a day. Least sunny months in Williams Bay: January, February and December receive an average of 5 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Williams Bay, 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 121 184 236 243 278 325 360 336 277 207 189 176
Mean daily daylight hours 9h 27m 10h 34m 11h 58m 13h 24m 14h 37m 15h 13m 14h 53m 13h 48m 12h 25m 11h 0m 9h 45m 9h 6m

Solar UV radiation in Williams Bay, Wisconsin, United States §

Williams Bay 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 Williams Bay UV Index data.

Average daily maximum UV levels by month for Williams Bay, 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 6 8 9 10 10 9 8 5 3 2

Detailed Monthly Weather Insights for Williams Bay, Wisconsin, United States

Discover in-depth weather details for every month in Williams Bay. 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 Williams Bay'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.