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Monthly climate in Prosser, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Prosser features a hot-summer Mediterranean climate (Csa).Temperatures typically range between 1 °C (34 °F) and 27 °C (81 °F) through the year, but rarely can drop to -24 °C (-11 °F) or can rise to as high as 47 °C (117 °F).The average annual precipitation amounts to about 243 mm (9.6 inches) and receives 58 rainy days on the 1 mm (0.04 inches) threshold annually.Prosser enjoys an average of 3194 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 Prosser, Washington, United States §

The warmest months in Prosser are June, July and August, with daily mean temperatures ranging from 23 to 27 °C (74 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 2 °C (34 - 36 °F) throughout the day. On average each year, Prosser experiences 108 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 Prosser, 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
(59°F)		 20°C
(68°F)		 22°C
(72°F)		 32°C
(91°F)		 36°C
(98°F)		 47°C
(117°F)		 44°C
(112°F)		 43°C
(110°F)		 39°C
(103°F)		 32°C
(90°F)		 22°C
(73°F)		 20°C
(68°F)
Mean maximum 12°C
(54°F)		 15°C
(60°F)		 21°C
(70°F)		 27°C
(81°F)		 34°C
(93°F)		 37°C
(99°F)		 42°C
(107°F)		 42°C
(107°F)		 37°C
(98°F)		 27°C
(80°F)		 20°C
(68°F)		 15°C
(60°F)
Average high 5°C
(41°F)		 7°C
(45°F)		 14°C
(57°F)		 19°C
(67°F)		 25°C
(78°F)		 30°C
(86°F)		 35°C
(95°F)		 34°C
(94°F)		 28°C
(82°F)		 18°C
(65°F)		 10°C
(50°F)		 5°C
(41°F)
Daily mean 1°C
(34°F)		 2°C
(36°F)		 8°C
(46°F)		 13°C
(55°F)		 19°C
(66°F)		 23°C
(74°F)		 27°C
(81°F)		 27°C
(80°F)		 20°C
(69°F)		 12°C
(53°F)		 5°C
(42°F)		 2°C
(35°F)
Average low -2°C
(29°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)		 12°C
(55°F)		 6°C
(42°F)		 1°C
(34°F)		 -1°C
(30°F)
Mean minimum -9°C
(15°F)		 -10°C
(14°F)		 -5°C
(24°F)		 0°C
(32°F)		 5°C
(41°F)		 9°C
(49°F)		 13°C
(55°F)		 11°C
(52°F)		 6°C
(43°F)		 -3°C
(27°F)		 -5°C
(22°F)		 -8°C
(18°F)
Minimum -24°C
(-11°F)		 -14°C
(8°F)		 -16°C
(3°F)		 -2°C
(29°F)		 4°C
(39°F)		 8°C
(47°F)		 12°C
(54°F)		 10°C
(50°F)		 5°C
(40°F)		 -10°C
(15°F)		 -8°C
(17°F)		 -9°C
(16°F)

Compare climate in Prosser with other places

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

Monthly average precipitation in Prosser, Washington, United States §

Prosser usually has the most precipitation in January, February and December, with an average of 8 rainy days and 37 mm (1.4 inches) of precipitation per month.The driest months in Prosser 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 Prosser, 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) 39 (1.5) 39 (1.5) 24 (0.9) 22 (0.9) 15 (0.6) 6 (0.2) 1 (0.0) 4 (0.1) 9 (0.3) 24 (1.0) 31 (1.2) 31 (1.2)
Average precipitation days (≥ 1 mm) 10 9 6 5 3 2 0 1 2 5 8 7

Monthly sunshine hours in Prosser, Washington, United States §

The sunniest months in Prosser are June, July and August, when the sun shines an average of 12 hours 34 minutes a day.Least sunny months in Prosser: January, February and December receive an average of 4 hours 35 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Prosser, 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 106 168 246 297 356 379 415 361 293 248 176 142
Mean daily daylight hours 9h 4m 10h 21m 11h 57m 13h 35m 15h 0m 15h 42m 15h 18m 14h 3m 12h 28m 10h 50m 9h 24m 8h 39m

Solar UV radiation in Prosser, Washington, United States §

Prosser 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 Prosser UV Index data.

Average daily maximum UV levels by month for Prosser, 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