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Monthly climate in De Witt, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification De Witt features a humid continental climate (Dfa).Temperatures typically range between -5 °C (23 °F) and 25 °C (77 °F) through the year, but rarely can drop to -34 °C (-30 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1064 mm (41.9 inches) and receives 113 rainy days on the 1 mm (0.04 inches) threshold annually.De Witt enjoys an average of 2997 hours of sunshine throughout the year, and daylight varies from 9 hours 10 minutes to 15 hours 9 minutes per day.

Monthly average temperatures in De Witt, Iowa, United States §

The warmest months in De Witt 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 -5 to 0 °C (23 - 32 °F) throughout the day. On average each year, De Witt experiences 93 days above 25 °C (77.0 °F) and 116 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in De Witt, 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)		 21°C
(70°F)		 24°C
(75°F)		 29°C
(84°F)		 35°C
(94°F)		 34°C
(94°F)		 36°C
(97°F)		 34°C
(94°F)		 34°C
(94°F)		 31°C
(88°F)		 24°C
(75°F)		 21°C
(70°F)
Mean maximum 9°C
(48°F)		 13°C
(57°F)		 20°C
(68°F)		 27°C
(80°F)		 32°C
(89°F)		 33°C
(91°F)		 34°C
(93°F)		 33°C
(92°F)		 32°C
(90°F)		 30°C
(86°F)		 18°C
(65°F)		 16°C
(61°F)
Average high -1°C
(30°F)		 1°C
(34°F)		 9°C
(49°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
(63°F)		 8°C
(47°F)		 4°C
(40°F)
Daily mean -5°C
(23°F)		 -4°C
(25°F)		 4°C
(40°F)		 9°C
(49°F)		 17°C
(62°F)		 23°C
(73°F)		 25°C
(77°F)		 23°C
(73°F)		 20°C
(68°F)		 12°C
(54°F)		 4°C
(39°F)		 -0°C
(32°F)
Average low -9°C
(16°F)		 -9°C
(17°F)		 -1°C
(31°F)		 4°C
(40°F)		 12°C
(53°F)		 18°C
(64°F)		 20°C
(68°F)		 17°C
(64°F)		 14°C
(58°F)		 7°C
(46°F)		 -1°C
(30°F)		 -4°C
(24°F)
Mean minimum -24°C
(-11°F)		 -22°C
(-7°F)		 -12°C
(10°F)		 -5°C
(24°F)		 3°C
(38°F)		 13°C
(55°F)		 15°C
(59°F)		 12°C
(54°F)		 7°C
(45°F)		 -2°C
(28°F)		 -11°C
(13°F)		 -14°C
(6°F)
Minimum -32°C
(-25°F)		 -34°C
(-30°F)		 -21°C
(-6°F)		 -9°C
(16°F)		 -0°C
(32°F)		 9°C
(49°F)		 14°C
(57°F)		 11°C
(53°F)		 4°C
(39°F)		 -5°C
(24°F)		 -16°C
(3°F)		 -22°C
(-7°F)

Compare climate in De Witt with other places

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

Monthly average precipitation in De Witt, Iowa, United States §

De Witt usually has the most precipitation in May, June and September, with an average of 11 rainy days and 130 mm (5.1 inches) of precipitation per month.The driest months in De Witt are January, November and December. On average, 50 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in De Witt, 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) 54 (2.1) 60 (2.4) 86 (3.4) 102 (4.0) 145 (5.7) 126 (5.0) 80 (3.1) 83 (3.3) 119 (4.7) 114 (4.5) 48 (1.9) 48 (1.9)
Average precipitation days (≥ 1 mm) 7 9 9 12 15 10 10 8 10 11 6 6

Monthly sunshine hours in De Witt, Iowa, United States §

The sunniest months in De Witt are June, July and August, when the sun shines an average of 11 hours 13 minutes a day.Least sunny months in De Witt: 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 De Witt, 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 131 187 228 242 271 333 362 336 278 223 200 199
Mean daily daylight hours 9h 31m 10h 36m 11h 58m 13h 22m 14h 33m 15h 9m 14h 49m 13h 46m 12h 25m 11h 1m 9h 48m 9h 10m

Solar UV radiation in De Witt, Iowa, United States §

De Witt 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 Low / 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 De Witt UV Index data.

Average daily maximum UV levels by month for De Witt, 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 2