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Monthly climate in Okanogan, Washington, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Okanogan features a humid continental climate (Dsb). Temperatures typically range between -3 °C (27 °F) and 23 °C (74 °F) through the year, but rarely can drop to -27 °C (-17 °F) or can rise to as high as 42 °C (108 °F). The average annual precipitation amounts to about 427 mm (16.8 inches) and receives 76 rainy days on the 1 mm (0.04 inches) threshold annually. Okanogan enjoys an average of 3057 hours of sunshine throughout the year, and daylight varies from 8 hours 22 minutes to 16 hours 1 minutes per day.

Monthly average temperatures in Okanogan, Washington, United States §

The warmest months in Okanogan are June, July and August, with daily mean temperatures ranging from 19 to 23 °C (67 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to -2 °C (27 - 28 °F) throughout the day. On average each year, Okanogan experiences 72 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 Okanogan, 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 8°C
(46°F)		 12°C
(53°F)		 19°C
(67°F)		 25°C
(78°F)		 31°C
(89°F)		 42°C
(108°F)		 41°C
(106°F)		 39°C
(102°F)		 34°C
(94°F)		 24°C
(75°F)		 16°C
(61°F)		 15°C
(60°F)
Mean maximum 6°C
(42°F)		 8°C
(47°F)		 16°C
(61°F)		 21°C
(70°F)		 29°C
(84°F)		 32°C
(91°F)		 37°C
(98°F)		 37°C
(98°F)		 31°C
(88°F)		 20°C
(69°F)		 14°C
(58°F)		 8°C
(46°F)
Average high 0°C
(33°F)		 2°C
(36°F)		 9°C
(48°F)		 14°C
(58°F)		 21°C
(70°F)		 26°C
(78°F)		 30°C
(87°F)		 30°C
(85°F)		 22°C
(73°F)		 13°C
(56°F)		 6°C
(43°F)		 1°C
(33°F)
Daily mean -3°C
(27°F)		 -2°C
(28°F)		 4°C
(39°F)		 9°C
(48°F)		 15°C
(59°F)		 19°C
(67°F)		 23°C
(74°F)		 22°C
(72°F)		 16°C
(61°F)		 8°C
(46°F)		 2°C
(36°F)		 -2°C
(28°F)
Average low -6°C
(22°F)		 -7°C
(20°F)		 -1°C
(30°F)		 3°C
(37°F)		 8°C
(47°F)		 12°C
(54°F)		 15°C
(58°F)		 14°C
(58°F)		 10°C
(50°F)		 3°C
(37°F)		 -1°C
(30°F)		 -5°C
(23°F)
Mean minimum -18°C
(0°F)		 -15°C
(4°F)		 -10°C
(15°F)		 -3°C
(27°F)		 2°C
(35°F)		 6°C
(44°F)		 10°C
(50°F)		 9°C
(48°F)		 4°C
(39°F)		 -4°C
(25°F)		 -8°C
(19°F)		 -15°C
(5°F)
Minimum -27°C
(-17°F)		 -20°C
(-4°F)		 -24°C
(-11°F)		 -5°C
(24°F)		 0°C
(32°F)		 4°C
(40°F)		 9°C
(48°F)		 7°C
(44°F)		 3°C
(38°F)		 -7°C
(19°F)		 -10°C
(14°F)		 -22°C
(-7°F)

Compare climate in Okanogan with other places

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

Monthly average precipitation in Okanogan, Washington, United States §

Okanogan usually has the most precipitation in January, November and December, with an average of 11 rainy days and 63 mm (2.5 inches) of precipitation per month. The driest months in Okanogan are June, July and August. On average, 6 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Okanogan, 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) 72 (2.8) 48 (1.9) 45 (1.8) 34 (1.3) 33 (1.3) 12 (0.5) 2 (0.1) 5 (0.2) 21 (0.8) 39 (1.5) 54 (2.1) 63 (2.5)
Average precipitation days (≥ 1 mm) 11 9 8 5 6 4 0 1 4 6 11 11

Monthly sunshine hours in Okanogan, Washington, United States §

The sunniest months in Okanogan are June, July and August, when the sun shines an average of 12 hours 28 minutes a day. Least sunny months in Okanogan: January, November and December receive an average of 3 hours 54 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Okanogan, 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 96 165 239 285 347 374 411 361 283 229 144 118
Mean daily daylight hours 8h 49m 10h 13m 11h 57m 13h 43m 15h 14m 16h 1m 15h 35m 14h 13m 12h 30m 10h 44m 9h 11m 8h 22m

Solar UV radiation in Okanogan, Washington, United States §

Okanogan experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, 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 Okanogan UV Index data.

Average daily maximum UV levels by month for Okanogan, 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 4 5 6 8 9 9 8 7 5 3 2

Detailed Monthly Weather Insights for Okanogan, Washington, United States

Discover in-depth weather details for every month in Okanogan. 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 Okanogan'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.