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Monthly climate in West Union, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification West Union features a humid continental climate (Dfa).Temperatures typically range between -7 °C (20 °F) and 23 °C (74 °F) through the year, but rarely can drop to -34 °C (-28 °F) or can rise to as high as 35 °C (94 °F).The average annual precipitation amounts to about 1078 mm (42.4 inches) and receives 113 rainy days on the 1 mm (0.04 inches) threshold annually.West Union enjoys an average of 2890 hours of sunshine throughout the year, and daylight varies from 9 hours 2 minutes to 15 hours 17 minutes per day.

Monthly average temperatures in West Union, Iowa, United States §

The warmest months in West Union are June, July and August, with daily mean temperatures ranging from 21 to 23 °C (71 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -7 to -2 °C (20 - 28 °F) throughout the day. On average each year, West Union experiences 75 days above 25 °C (77.0 °F) and 134 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 Union, 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 11°C
(52°F)		 19°C
(66°F)		 21°C
(70°F)		 26°C
(80°F)		 33°C
(92°F)		 35°C
(94°F)		 34°C
(93°F)		 34°C
(93°F)		 32°C
(90°F)		 30°C
(86°F)		 22°C
(72°F)		 20°C
(69°F)
Mean maximum 8°C
(46°F)		 11°C
(52°F)		 17°C
(64°F)		 24°C
(75°F)		 31°C
(88°F)		 32°C
(90°F)		 32°C
(91°F)		 31°C
(88°F)		 30°C
(87°F)		 28°C
(83°F)		 17°C
(62°F)		 14°C
(57°F)
Average high -3°C
(26°F)		 -2°C
(29°F)		 6°C
(44°F)		 12°C
(55°F)		 20°C
(69°F)		 27°C
(80°F)		 28°C
(82°F)		 26°C
(80°F)		 23°C
(74°F)		 14°C
(58°F)		 6°C
(43°F)		 2°C
(35°F)
Daily mean -7°C
(20°F)		 -6°C
(21°F)		 2°C
(36°F)		 7°C
(46°F)		 15°C
(60°F)		 22°C
(71°F)		 23°C
(74°F)		 21°C
(71°F)		 18°C
(65°F)		 10°C
(50°F)		 2°C
(35°F)		 -2°C
(28°F)
Average low -11°C
(13°F)		 -11°C
(12°F)		 -2°C
(28°F)		 2°C
(36°F)		 10°C
(51°F)		 16°C
(62°F)		 18°C
(65°F)		 16°C
(61°F)		 13°C
(55°F)		 5°C
(42°F)		 -3°C
(27°F)		 -6°C
(21°F)
Mean minimum -25°C
(-13°F)		 -25°C
(-12°F)		 -15°C
(5°F)		 -6°C
(21°F)		 2°C
(35°F)		 11°C
(51°F)		 13°C
(56°F)		 11°C
(52°F)		 5°C
(42°F)		 -4°C
(24°F)		 -12°C
(11°F)		 -18°C
(1°F)
Minimum -33°C
(-28°F)		 -34°C
(-28°F)		 -24°C
(-12°F)		 -11°C
(13°F)		 -3°C
(28°F)		 8°C
(47°F)		 11°C
(52°F)		 10°C
(51°F)		 1°C
(35°F)		 -6°C
(21°F)		 -17°C
(2°F)		 -23°C
(-9°F)

Compare climate in West Union with other places

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

Monthly average precipitation in West Union, Iowa, United States §

West Union usually has the most precipitation in May, June and October, with an average of 12 rainy days and 143 mm (5.6 inches) of precipitation per month.The driest months in West Union are January, November and December. On average, 42 mm (1.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in West Union, 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) 40 (1.6) 52 (2.1) 64 (2.5) 76 (3.0) 162 (6.4) 132 (5.2) 103 (4.1) 104 (4.1) 122 (4.8) 136 (5.3) 50 (2.0) 38 (1.5)
Average precipitation days (≥ 1 mm) 7 8 8 10 14 11 10 10 11 11 7 6

Monthly sunshine hours in West Union, Iowa, United States §

The sunniest months in West Union are June, July and August, when the sun shines an average of 11 hours 1 minutes a day.Least sunny months in West Union: January, November and December receive an average of 5 hours 25 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in West Union, 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 128 194 230 232 257 331 359 323 261 200 191 179
Mean daily daylight hours 9h 24m 10h 32m 11h 58m 13h 25m 14h 40m 15h 17m 14h 57m 13h 50m 12h 26m 10h 58m 9h 42m 9h 2m

Solar UV radiation in West Union, Iowa, United States §

West Union 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 West Union UV Index data.

Average daily maximum UV levels by month for West Union, 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 4 5 8 9 10 10 9 8 5 3 2