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Monthly climate in Walnut, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Walnut 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 (-26 °F) or can rise to as high as 39 °C (102 °F).The average annual precipitation amounts to about 948 mm (37.3 inches) and receives 104 rainy days on the 1 mm (0.04 inches) threshold annually.Walnut enjoys an average of 3086 hours of sunshine throughout the year, and daylight varies from 9 hours 12 minutes to 15 hours 6 minutes per day.

Monthly average temperatures in Walnut, Iowa, United States §

The warmest months in Walnut 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 -1 °C (24 - 31 °F) throughout the day. On average each year, Walnut experiences 97 days above 25 °C (77.0 °F) and 122 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Walnut, 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)		 21°C
(70°F)		 25°C
(78°F)		 31°C
(88°F)		 35°C
(96°F)		 39°C
(102°F)		 35°C
(96°F)		 35°C
(95°F)		 35°C
(96°F)		 31°C
(88°F)		 26°C
(78°F)		 21°C
(71°F)
Mean maximum 11°C
(53°F)		 15°C
(60°F)		 22°C
(72°F)		 27°C
(81°F)		 32°C
(90°F)		 34°C
(93°F)		 34°C
(94°F)		 33°C
(91°F)		 33°C
(92°F)		 30°C
(86°F)		 19°C
(67°F)		 15°C
(60°F)
Average high -0°C
(32°F)		 1°C
(34°F)		 10°C
(50°F)		 15°C
(60°F)		 22°C
(71°F)		 29°C
(84°F)		 30°C
(86°F)		 28°C
(83°F)		 26°C
(78°F)		 16°C
(62°F)		 9°C
(49°F)		 4°C
(40°F)
Daily mean -5°C
(24°F)		 -4°C
(24°F)		 4°C
(40°F)		 9°C
(49°F)		 17°C
(62°F)		 24°C
(75°F)		 25°C
(77°F)		 23°C
(74°F)		 20°C
(69°F)		 11°C
(52°F)		 4°C
(39°F)		 -1°C
(31°F)
Average low -9°C
(16°F)		 -9°C
(15°F)		 -0°C
(31°F)		 4°C
(39°F)		 12°C
(53°F)		 18°C
(65°F)		 20°C
(68°F)		 18°C
(64°F)		 15°C
(59°F)		 6°C
(43°F)		 -2°C
(29°F)		 -6°C
(22°F)
Mean minimum -24°C
(-10°F)		 -22°C
(-8°F)		 -11°C
(13°F)		 -6°C
(21°F)		 4°C
(39°F)		 12°C
(53°F)		 14°C
(57°F)		 11°C
(53°F)		 6°C
(44°F)		 -3°C
(26°F)		 -11°C
(13°F)		 -15°C
(5°F)
Minimum -29°C
(-20°F)		 -32°C
(-26°F)		 -21°C
(-5°F)		 -11°C
(13°F)		 2°C
(36°F)		 9°C
(48°F)		 12°C
(54°F)		 10°C
(50°F)		 4°C
(40°F)		 -7°C
(20°F)		 -16°C
(3°F)		 -23°C
(-10°F)

Compare climate in Walnut with other places

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

Monthly average precipitation in Walnut, Iowa, United States §

Walnut usually has the most precipitation in May, June and October, with an average of 12 rainy days and 131 mm (5.2 inches) of precipitation per month.The driest months in Walnut are January, February and November. On average, 33 mm (1.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Walnut, 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) 30 (1.2) 36 (1.4) 86 (3.4) 57 (2.3) 157 (6.2) 109 (4.3) 68 (2.7) 108 (4.3) 98 (3.8) 128 (5.0) 34 (1.3) 36 (1.4)
Average precipitation days (≥ 1 mm) 5 6 10 11 16 10 8 9 10 10 5 4

Monthly sunshine hours in Walnut, Iowa, United States §

The sunniest months in Walnut are June, July and August, when the sun shines an average of 11 hours 27 minutes a day.Least sunny months in Walnut: January, February and November receive an average of 6 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Walnut, 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 147 201 217 262 263 350 375 328 280 229 211 217
Mean daily daylight hours 9h 33m 10h 37m 11h 58m 13h 21m 14h 31m 15h 6m 14h 47m 13h 44m 12h 24m 11h 2m 9h 49m 9h 12m

Solar UV radiation in Walnut, Iowa, United States §

Walnut experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 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 Walnut UV Index data.

Average daily maximum UV levels by month for Walnut, 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 10 11 10 9 8 6 4 3