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Monthly climate in Iowa City, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Iowa City features a humid continental climate (Dfa).Temperatures typically range between -6 °C (22 °F) and 25 °C (77 °F) through the year, but rarely can drop to -34 °C (-29 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1061 mm (41.8 inches) and receives 109 rainy days on the 1 mm (0.04 inches) threshold annually.Iowa City enjoys an average of 3007 hours of sunshine throughout the year, and daylight varies from 9 hours 11 minutes to 15 hours 8 minutes per day.

Monthly average temperatures in Iowa City, Iowa, United States §

The warmest months in Iowa City are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (73 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -1 °C (22 - 31 °F) throughout the day. On average each year, Iowa City experiences 94 days above 25 °C (77.0 °F) and 118 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Iowa City, 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 12°C
(54°F)		 22°C
(71°F)		 23°C
(74°F)		 29°C
(84°F)		 35°C
(95°F)		 35°C
(96°F)		 36°C
(97°F)		 35°C
(95°F)		 34°C
(94°F)		 31°C
(88°F)		 24°C
(75°F)		 22°C
(72°F)
Mean maximum 9°C
(49°F)		 14°C
(57°F)		 20°C
(68°F)		 26°C
(80°F)		 32°C
(89°F)		 33°C
(93°F)		 34°C
(93°F)		 33°C
(91°F)		 32°C
(91°F)		 30°C
(86°F)		 18°C
(65°F)		 16°C
(61°F)
Average high -2°C
(29°F)		 0°C
(33°F)		 9°C
(48°F)		 15°C
(59°F)		 22°C
(71°F)		 28°C
(82°F)		 29°C
(85°F)		 28°C
(83°F)		 26°C
(78°F)		 17°C
(62°F)		 8°C
(47°F)		 4°C
(39°F)
Daily mean -6°C
(22°F)		 -4°C
(24°F)		 4°C
(39°F)		 9°C
(49°F)		 17°C
(62°F)		 23°C
(74°F)		 25°C
(77°F)		 23°C
(73°F)		 20°C
(68°F)		 12°C
(53°F)		 3°C
(38°F)		 -1°C
(31°F)
Average low -10°C
(15°F)		 -9°C
(16°F)		 -1°C
(31°F)		 4°C
(39°F)		 12°C
(53°F)		 18°C
(64°F)		 20°C
(68°F)		 17°C
(63°F)		 14°C
(58°F)		 7°C
(45°F)		 -1°C
(30°F)		 -5°C
(23°F)
Mean minimum -24°C
(-11°F)		 -23°C
(-8°F)		 -14°C
(8°F)		 -5°C
(23°F)		 3°C
(38°F)		 12°C
(54°F)		 14°C
(58°F)		 12°C
(54°F)		 7°C
(45°F)		 -3°C
(27°F)		 -10°C
(14°F)		 -15°C
(5°F)
Minimum -33°C
(-27°F)		 -34°C
(-29°F)		 -23°C
(-9°F)		 -10°C
(14°F)		 0°C
(33°F)		 9°C
(49°F)		 12°C
(54°F)		 11°C
(52°F)		 3°C
(38°F)		 -5°C
(23°F)		 -16°C
(3°F)		 -22°C
(-8°F)

Compare climate in Iowa City with other places

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

Monthly average precipitation in Iowa City, Iowa, United States §

Iowa City usually has the most precipitation in May, September and October, with an average of 11 rainy days and 135 mm (5.3 inches) of precipitation per month.The driest months in Iowa City are January, November and December. On average, 48 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Iowa City, 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) 48 (1.9) 58 (2.3) 80 (3.2) 84 (3.3) 139 (5.5) 128 (5.0) 79 (3.1) 83 (3.3) 130 (5.1) 135 (5.3) 50 (2.0) 46 (1.8)
Average precipitation days (≥ 1 mm) 7 8 9 10 15 10 10 8 9 11 7 5

Monthly sunshine hours in Iowa City, Iowa, United States §

The sunniest months in Iowa City are June, July and August, when the sun shines an average of 11 hours 16 minutes a day.Least sunny months in Iowa City: January, February and December receive an average of 5 hours 45 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Iowa City, 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 133 188 225 247 267 336 365 334 276 222 207 202
Mean daily daylight hours 9h 31m 10h 36m 11h 58m 13h 22m 14h 33m 15h 8m 14h 49m 13h 45m 12h 25m 11h 1m 9h 48m 9h 11m

Solar UV radiation in Iowa City, Iowa, United States §

Iowa City 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 Iowa City UV Index data.

Average daily maximum UV levels by month for Iowa City, 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