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Monthly climate in Onalaska, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Onalaska features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 4 °C (39 °F) and 19 °C (66 °F) through the year, but rarely can drop to -10 °C (15 °F) or can rise to as high as 44 °C (111 °F).The average annual precipitation amounts to about 1457 mm (57.4 inches) and receives 154 rainy days on the 1 mm (0.04 inches) threshold annually.Onalaska enjoys an average of 2503 hours of sunshine throughout the year, and daylight varies from 8 hours 37 minutes to 15 hours 45 minutes per day.

Monthly average temperatures in Onalaska, Washington, United States §

The warmest months in Onalaska are July, August and September, with daily mean temperatures ranging from 16 to 19 °C (60 - 66 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 5 °C (39 - 41 °F) throughout the day. On average each year, Onalaska experiences 39 days above 25 °C (77.0 °F) and 42 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Onalaska, Washington, 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 15°C
(60°F)		 15°C
(59°F)		 24°C
(75°F)		 28°C
(84°F)		 30°C
(86°F)		 44°C
(111°F)		 35°C
(96°F)		 37°C
(98°F)		 33°C
(91°F)		 24°C
(76°F)		 18°C
(64°F)		 14°C
(57°F)
Mean maximum 13°C
(56°F)		 13°C
(55°F)		 18°C
(65°F)		 24°C
(75°F)		 27°C
(82°F)		 32°C
(90°F)		 32°C
(90°F)		 35°C
(95°F)		 30°C
(86°F)		 21°C
(69°F)		 16°C
(61°F)		 12°C
(55°F)
Average high 8°C
(46°F)		 7°C
(45°F)		 11°C
(52°F)		 14°C
(58°F)		 18°C
(65°F)		 21°C
(70°F)		 25°C
(77°F)		 26°C
(78°F)		 21°C
(71°F)		 15°C
(59°F)		 10°C
(51°F)		 7°C
(45°F)
Daily mean 5°C
(41°F)		 4°C
(39°F)		 6°C
(44°F)		 9°C
(49°F)		 13°C
(55°F)		 15°C
(60°F)		 18°C
(65°F)		 19°C
(66°F)		 16°C
(60°F)		 10°C
(50°F)		 7°C
(44°F)		 4°C
(40°F)
Average low 2°C
(36°F)		 1°C
(34°F)		 3°C
(37°F)		 5°C
(41°F)		 8°C
(46°F)		 10°C
(51°F)		 12°C
(54°F)		 12°C
(55°F)		 11°C
(51°F)		 6°C
(43°F)		 4°C
(39°F)		 2°C
(36°F)
Mean minimum -5°C
(24°F)		 -5°C
(23°F)		 -2°C
(28°F)		 -0°C
(32°F)		 3°C
(37°F)		 6°C
(43°F)		 8°C
(47°F)		 8°C
(47°F)		 5°C
(42°F)		 -1°C
(31°F)		 -2°C
(28°F)		 -5°C
(24°F)
Minimum -10°C
(15°F)		 -8°C
(18°F)		 -4°C
(25°F)		 -1°C
(30°F)		 2°C
(35°F)		 5°C
(42°F)		 8°C
(46°F)		 8°C
(46°F)		 4°C
(40°F)		 -4°C
(25°F)		 -4°C
(25°F)		 -6°C
(21°F)

Compare climate in Onalaska with other places

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

Monthly average precipitation in Onalaska, Washington, United States §

Onalaska usually has the most precipitation in January, February and December, with an average of 18 rainy days and 195 mm (7.7 inches) of precipitation per month.The driest months in Onalaska are June, July and August. On average, 30 mm (1.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Onalaska, Washington, 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) 188 (7.4) 196 (7.7) 151 (5.9) 129 (5.1) 80 (3.2) 62 (2.4) 12 (0.5) 15 (0.6) 86 (3.4) 149 (5.9) 187 (7.3) 202 (8.0)
Average precipitation days (≥ 1 mm) 16 19 17 16 12 9 2 3 10 13 18 19

Monthly sunshine hours in Onalaska, Washington, United States §

The sunniest months in Onalaska are June, July and August, when the sun shines an average of 10 hours 41 minutes a day.Least sunny months in Onalaska: January, February and December receive an average of 3 hours 7 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Onalaska, Washington, 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 78 111 186 213 280 303 356 323 249 190 115 94
Mean daily daylight hours 9h 2m 10h 20m 11h 57m 13h 37m 15h 2m 15h 45m 15h 21m 14h 4m 12h 28m 10h 49m 9h 22m 8h 37m

Solar UV radiation in Onalaska, Washington, United States §

Onalaska experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, February 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 Onalaska UV Index data.

Average daily maximum UV levels by month for Onalaska, Washington, 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) 2 3 5 6 9 10 9 8 7 5 3 2