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Monthly climate in Washington, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Washington features a humid continental climate (Dfa).Temperatures typically range between -5 °C (24 °F) and 25 °C (77 °F) through the year, but rarely can drop to -32 °C (-25 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 1049 mm (41.3 inches) and receives 107 rainy days on the 1 mm (0.04 inches) threshold annually.Washington enjoys an average of 2995 hours of sunshine throughout the year, and daylight varies from 9 hours 14 minutes to 15 hours 4 minutes per day.

Monthly average temperatures in Washington, Iowa, United States §

The warmest months in Washington are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (74 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to 0 °C (24 - 32 °F) throughout the day. On average each year, Washington experiences 101 days above 25 °C (77.0 °F) and 112 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Washington, Iowa, 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 13°C
(56°F)		 22°C
(72°F)		 23°C
(74°F)		 29°C
(85°F)		 36°C
(98°F)		 37°C
(99°F)		 37°C
(98°F)		 37°C
(99°F)		 34°C
(94°F)		 31°C
(89°F)		 24°C
(76°F)		 23°C
(73°F)
Mean maximum 11°C
(52°F)		 15°C
(60°F)		 20°C
(69°F)		 27°C
(81°F)		 32°C
(91°F)		 34°C
(94°F)		 35°C
(95°F)		 34°C
(93°F)		 33°C
(91°F)		 30°C
(87°F)		 19°C
(66°F)		 17°C
(63°F)
Average high -1°C
(31°F)		 1°C
(35°F)		 10°C
(50°F)		 16°C
(60°F)		 22°C
(73°F)		 29°C
(84°F)		 30°C
(86°F)		 29°C
(84°F)		 26°C
(80°F)		 17°C
(64°F)		 9°C
(49°F)		 5°C
(41°F)
Daily mean -5°C
(24°F)		 -3°C
(26°F)		 5°C
(41°F)		 10°C
(50°F)		 17°C
(63°F)		 24°C
(75°F)		 25°C
(77°F)		 23°C
(74°F)		 20°C
(69°F)		 12°C
(54°F)		 4°C
(39°F)		 0°C
(32°F)
Average low -9°C
(16°F)		 -8°C
(17°F)		 0°C
(33°F)		 4°C
(40°F)		 12°C
(54°F)		 18°C
(65°F)		 20°C
(68°F)		 18°C
(64°F)		 15°C
(59°F)		 7°C
(46°F)		 -1°C
(30°F)		 -4°C
(24°F)
Mean minimum -23°C
(-9°F)		 -21°C
(-5°F)		 -12°C
(12°F)		 -5°C
(23°F)		 4°C
(40°F)		 13°C
(55°F)		 15°C
(58°F)		 12°C
(54°F)		 7°C
(45°F)		 -3°C
(28°F)		 -11°C
(12°F)		 -15°C
(6°F)
Minimum -31°C
(-23°F)		 -32°C
(-25°F)		 -20°C
(-3°F)		 -10°C
(14°F)		 1°C
(33°F)		 9°C
(48°F)		 13°C
(55°F)		 11°C
(52°F)		 5°C
(41°F)		 -5°C
(23°F)		 -16°C
(4°F)		 -22°C
(-7°F)

Compare climate in Washington with other places

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

Monthly average precipitation in Washington, Iowa, United States §

Washington usually has the most precipitation in May, June and October, with an average of 12 rainy days and 140 mm (5.5 inches) of precipitation per month.The driest months in Washington are January, November and December. On average, 49 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Washington, Iowa, 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) 51 (2.0) 58 (2.3) 89 (3.5) 82 (3.2) 151 (5.9) 142 (5.6) 70 (2.7) 68 (2.7) 113 (4.5) 128 (5.0) 50 (2.0) 47 (1.8)
Average precipitation days (≥ 1 mm) 6 8 10 10 15 11 9 8 8 11 6 5

Monthly sunshine hours in Washington, Iowa, United States §

The sunniest months in Washington are June, July and August, when the sun shines an average of 11 hours 11 minutes a day.Least sunny months in Washington: January, February and December receive an average of 5 hours 42 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Washington, Iowa, 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 130 186 224 245 267 335 359 333 278 223 205 203
Mean daily daylight hours 9h 34m 10h 38m 11h 58m 13h 20m 14h 30m 15h 4m 14h 45m 13h 43m 12h 24m 11h 2m 9h 51m 9h 14m

Solar UV radiation in Washington, Iowa, United States §

Washington experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Washington UV Index data.

Average daily maximum UV levels by month for Washington, Iowa, 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) 3 5 6 8 9 11 10 9 8 6 4 3