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Monthly climate in West Richland, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification West Richland features a cold semi-arid climate (BSk).Temperatures typically range between 2 °C (35 °F) and 28 °C (82 °F) through the year, but rarely can drop to -20 °C (-3 °F) or can rise to as high as 48 °C (118 °F).The average annual precipitation amounts to about 239 mm (9.4 inches) and receives 55 rainy days on the 1 mm (0.04 inches) threshold annually.West Richland enjoys an average of 3202 hours of sunshine throughout the year, and daylight varies from 8 hours 39 minutes to 15 hours 42 minutes per day.

Monthly average temperatures in West Richland, Washington, United States §

The warmest months in West Richland are June, July and August, with daily mean temperatures ranging from 24 to 28 °C (75 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 2 °C (35 - 37 °F) throughout the day. On average each year, West Richland experiences 111 days above 25 °C (77.0 °F) and 73 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in West Richland, 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 16°C
(62°F)		 20°C
(68°F)		 23°C
(73°F)		 33°C
(91°F)		 37°C
(98°F)		 48°C
(118°F)		 45°C
(113°F)		 43°C
(109°F)		 39°C
(103°F)		 32°C
(90°F)		 23°C
(74°F)		 20°C
(68°F)
Mean maximum 12°C
(55°F)		 16°C
(61°F)		 21°C
(71°F)		 28°C
(82°F)		 34°C
(94°F)		 38°C
(100°F)		 42°C
(108°F)		 42°C
(107°F)		 37°C
(99°F)		 27°C
(81°F)		 21°C
(70°F)		 16°C
(62°F)
Average high 5°C
(42°F)		 7°C
(46°F)		 14°C
(58°F)		 20°C
(68°F)		 26°C
(79°F)		 31°C
(87°F)		 36°C
(96°F)		 35°C
(95°F)		 28°C
(82°F)		 19°C
(66°F)		 10°C
(51°F)		 5°C
(42°F)
Daily mean 2°C
(35°F)		 2°C
(37°F)		 8°C
(47°F)		 13°C
(56°F)		 19°C
(67°F)		 24°C
(75°F)		 28°C
(82°F)		 27°C
(80°F)		 20°C
(69°F)		 12°C
(54°F)		 6°C
(42°F)		 2°C
(36°F)
Average low -1°C
(30°F)		 -2°C
(29°F)		 2°C
(37°F)		 6°C
(44°F)		 12°C
(53°F)		 16°C
(60°F)		 18°C
(65°F)		 18°C
(64°F)		 13°C
(55°F)		 6°C
(43°F)		 2°C
(35°F)		 -1°C
(31°F)
Mean minimum -8°C
(17°F)		 -9°C
(15°F)		 -5°C
(24°F)		 1°C
(34°F)		 5°C
(41°F)		 9°C
(49°F)		 13°C
(55°F)		 11°C
(52°F)		 6°C
(44°F)		 -2°C
(29°F)		 -5°C
(24°F)		 -7°C
(20°F)
Minimum -20°C
(-3°F)		 -14°C
(7°F)		 -17°C
(2°F)		 -1°C
(30°F)		 3°C
(38°F)		 8°C
(47°F)		 12°C
(54°F)		 9°C
(49°F)		 5°C
(42°F)		 -8°C
(17°F)		 -8°C
(18°F)		 -9°C
(17°F)

Compare climate in West Richland with other places

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

Monthly average precipitation in West Richland, Washington, United States §

West Richland usually has the most precipitation in January, February and December, with an average of 8 rainy days and 35 mm (1.4 inches) of precipitation per month.The driest months in West Richland are June, July and August. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in West Richland, 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) 36 (1.4) 39 (1.5) 26 (1.0) 22 (0.9) 13 (0.5) 7 (0.3) 0 (0.0) 3 (0.1) 8 (0.3) 23 (0.9) 30 (1.2) 30 (1.2)
Average precipitation days (≥ 1 mm) 8 10 6 5 4 2 0 0 2 5 7 6

Monthly sunshine hours in West Richland, Washington, United States §

The sunniest months in West Richland are June, July and August, when the sun shines an average of 12 hours 32 minutes a day.Least sunny months in West Richland: January, February and December receive an average of 4 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in West Richland, 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 110 166 248 297 356 377 415 360 293 248 179 145
Mean daily daylight hours 9h 4m 10h 21m 11h 57m 13h 36m 15h 0m 15h 42m 15h 19m 14h 3m 12h 28m 10h 50m 9h 24m 8h 39m

Solar UV radiation in West Richland, Washington, United States §

West Richland experiences the highest level of ultraviolet (UV) radiation in May, 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, 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 West Richland UV Index data.

Average daily maximum UV levels by month for West Richland, 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 9 10 9 7 5 3 2