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Monthly climate in Coulee City, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Coulee City features a cold semi-arid climate (BSk).Temperatures typically range between -1 °C (30 °F) and 26 °C (78 °F) through the year, but rarely can drop to -24 °C (-10 °F) or can rise to as high as 46 °C (114 °F).The average annual precipitation amounts to about 307 mm (12.1 inches) and receives 68 rainy days on the 1 mm (0.04 inches) threshold annually.Coulee City enjoys an average of 3133 hours of sunshine throughout the year, and daylight varies from 8 hours 28 minutes to 15 hours 54 minutes per day.

Monthly average temperatures in Coulee City, Washington, United States §

The warmest months in Coulee City are June, July and August, with daily mean temperatures ranging from 21 to 26 °C (71 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 0 °C (30 - 32 °F) throughout the day. On average each year, Coulee City experiences 88 days above 25 °C (77.0 °F) and 87 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Coulee City, 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 11°C
(53°F)		 14°C
(58°F)		 20°C
(68°F)		 28°C
(83°F)		 34°C
(93°F)		 46°C
(114°F)		 43°C
(110°F)		 40°C
(105°F)		 37°C
(99°F)		 29°C
(85°F)		 18°C
(66°F)		 17°C
(63°F)
Mean maximum 8°C
(47°F)		 10°C
(50°F)		 18°C
(64°F)		 24°C
(75°F)		 31°C
(88°F)		 35°C
(95°F)		 39°C
(103°F)		 39°C
(103°F)		 33°C
(92°F)		 23°C
(74°F)		 16°C
(61°F)		 11°C
(53°F)
Average high 2°C
(35°F)		 3°C
(39°F)		 11°C
(51°F)		 16°C
(61°F)		 23°C
(73°F)		 27°C
(81°F)		 32°C
(90°F)		 32°C
(89°F)		 25°C
(76°F)		 15°C
(59°F)		 8°C
(46°F)		 2°C
(36°F)
Daily mean -1°C
(30°F)		 -1°C
(31°F)		 6°C
(42°F)		 11°C
(52°F)		 17°C
(63°F)		 21°C
(71°F)		 26°C
(78°F)		 25°C
(77°F)		 19°C
(66°F)		 10°C
(50°F)		 4°C
(40°F)		 -0°C
(32°F)
Average low -4°C
(26°F)		 -4°C
(25°F)		 1°C
(35°F)		 6°C
(42°F)		 11°C
(52°F)		 15°C
(59°F)		 18°C
(65°F)		 18°C
(65°F)		 13°C
(56°F)		 5°C
(42°F)		 1°C
(34°F)		 -3°C
(28°F)
Mean minimum -13°C
(8°F)		 -12°C
(11°F)		 -7°C
(20°F)		 -0°C
(32°F)		 5°C
(40°F)		 9°C
(49°F)		 13°C
(56°F)		 12°C
(54°F)		 6°C
(44°F)		 -2°C
(28°F)		 -5°C
(24°F)		 -10°C
(14°F)
Minimum -24°C
(-10°F)		 -16°C
(4°F)		 -17°C
(2°F)		 -2°C
(28°F)		 3°C
(38°F)		 8°C
(46°F)		 12°C
(54°F)		 11°C
(52°F)		 3°C
(38°F)		 -8°C
(18°F)		 -8°C
(18°F)		 -18°C
(-0°F)

Compare climate in Coulee City with other places

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

Monthly average precipitation in Coulee City, Washington, United States §

Coulee City usually has the most precipitation in January, November and December, with an average of 9 rainy days and 43 mm (1.7 inches) of precipitation per month.The driest months in Coulee City are June, July and August. On average, 5 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Coulee City, 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) 48 (1.9) 38 (1.5) 31 (1.2) 28 (1.1) 18 (0.7) 8 (0.3) 2 (0.1) 4 (0.2) 16 (0.6) 33 (1.3) 40 (1.6) 40 (1.6)
Average precipitation days (≥ 1 mm) 11 8 7 6 5 2 0 1 3 7 9 9

Monthly sunshine hours in Coulee City, Washington, United States §

The sunniest months in Coulee City are June, July and August, when the sun shines an average of 12 hours 37 minutes a day.Least sunny months in Coulee City: January, November and December receive an average of 4 hours 0 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Coulee City, 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 94 168 247 293 357 382 417 361 293 241 156 118
Mean daily daylight hours 8h 55m 10h 16m 11h 57m 13h 40m 15h 9m 15h 54m 15h 29m 14h 9m 12h 29m 10h 47m 9h 15m 8h 28m

Solar UV radiation in Coulee City, Washington, United States §

Coulee City 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 Coulee City UV Index data.

Average daily maximum UV levels by month for Coulee City, 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 10 9 7 5 3 2