nomadseason

Monthly climate in Afton, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Afton 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 -30 °C (-22 °F) or can rise to as high as 39 °C (102 °F).The average annual precipitation amounts to about 1047 mm (41.2 inches) and receives 107 rainy days on the 1 mm (0.04 inches) threshold annually.Afton enjoys an average of 3057 hours of sunshine throughout the year, and daylight varies from 9 hours 15 minutes to 15 hours 3 minutes per day.

Monthly average temperatures in Afton, Iowa, United States §

The warmest months in Afton 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, Afton experiences 98 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 Afton, 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 14°C
(58°F)		 22°C
(72°F)		 23°C
(74°F)		 30°C
(86°F)		 36°C
(98°F)		 39°C
(102°F)		 36°C
(96°F)		 36°C
(97°F)		 33°C
(91°F)		 31°C
(87°F)		 24°C
(76°F)		 22°C
(71°F)
Mean maximum 12°C
(55°F)		 16°C
(61°F)		 21°C
(71°F)		 27°C
(81°F)		 31°C
(89°F)		 34°C
(93°F)		 34°C
(94°F)		 33°C
(92°F)		 32°C
(90°F)		 29°C
(85°F)		 19°C
(67°F)		 17°C
(63°F)
Average high -0°C
(32°F)		 2°C
(35°F)		 10°C
(50°F)		 16°C
(60°F)		 22°C
(72°F)		 29°C
(84°F)		 30°C
(86°F)		 28°C
(83°F)		 26°C
(78°F)		 17°C
(62°F)		 9°C
(49°F)		 5°C
(41°F)
Daily mean -5°C
(24°F)		 -4°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)		 11°C
(53°F)		 4°C
(39°F)		 -0°C
(32°F)
Average low -9°C
(16°F)		 -9°C
(17°F)		 0°C
(32°F)		 4°C
(40°F)		 12°C
(54°F)		 18°C
(65°F)		 20°C
(68°F)		 18°C
(65°F)		 15°C
(59°F)		 6°C
(44°F)		 -1°C
(30°F)		 -5°C
(23°F)
Mean minimum -24°C
(-12°F)		 -21°C
(-6°F)		 -11°C
(13°F)		 -6°C
(21°F)		 4°C
(40°F)		 12°C
(54°F)		 14°C
(58°F)		 12°C
(54°F)		 7°C
(45°F)		 -3°C
(27°F)		 -12°C
(11°F)		 -15°C
(6°F)
Minimum -30°C
(-22°F)		 -28°C
(-18°F)		 -21°C
(-6°F)		 -10°C
(13°F)		 1°C
(35°F)		 10°C
(50°F)		 13°C
(56°F)		 10°C
(51°F)		 6°C
(42°F)		 -6°C
(21°F)		 -19°C
(-2°F)		 -23°C
(-10°F)

Compare climate in Afton with other places

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

Monthly average precipitation in Afton, Iowa, United States §

Afton usually has the most precipitation in May, September and October, with an average of 12 rainy days and 149 mm (5.9 inches) of precipitation per month.The driest months in Afton are January, February and December. On average, 37 mm (1.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Afton, 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) 39 (1.5) 36 (1.4) 88 (3.5) 67 (2.7) 170 (6.7) 114 (4.5) 84 (3.3) 96 (3.8) 132 (5.2) 145 (5.7) 40 (1.6) 36 (1.4)
Average precipitation days (≥ 1 mm) 6 7 11 11 16 10 8 9 9 11 5 4

Monthly sunshine hours in Afton, Iowa, United States §

The sunniest months in Afton are June, July and August, when the sun shines an average of 11 hours 25 minutes a day.Least sunny months in Afton: January, February and November receive an average of 6 hours 4 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Afton, 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 142 195 214 259 264 347 372 331 280 224 209 215
Mean daily daylight hours 9h 35m 10h 38m 11h 58m 13h 20m 14h 29m 15h 3m 14h 44m 13h 43m 12h 24m 11h 3m 9h 52m 9h 15m

Solar UV radiation in Afton, Iowa, United States §

Afton 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 Afton UV Index data.

Average daily maximum UV levels by month for Afton, 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