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Monthly climate in Ackley, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Ackley features a humid continental climate (Dfa).Temperatures typically range between -7 °C (20 °F) and 24 °C (75 °F) through the year, but rarely can drop to -34 °C (-28 °F) or can rise to as high as 37 °C (98 °F).The average annual precipitation amounts to about 1035 mm (40.7 inches) and receives 110 rainy days on the 1 mm (0.04 inches) threshold annually.Ackley enjoys an average of 3015 hours of sunshine throughout the year, and daylight varies from 9 hours 5 minutes to 15 hours 14 minutes per day.

Monthly average temperatures in Ackley, Iowa, United States §

The warmest months in Ackley are June, July and August, with daily mean temperatures ranging from 22 to 24 °C (72 - 75 °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 - 29 °F) throughout the day. On average each year, Ackley experiences 85 days above 25 °C (77.0 °F) and 130 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Ackley, 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
(55°F)		 20°C
(69°F)		 22°C
(72°F)		 28°C
(83°F)		 35°C
(95°F)		 36°C
(98°F)		 34°C
(93°F)		 37°C
(98°F)		 34°C
(93°F)		 31°C
(88°F)		 24°C
(76°F)		 22°C
(72°F)
Mean maximum 10°C
(50°F)		 13°C
(55°F)		 19°C
(67°F)		 26°C
(78°F)		 32°C
(90°F)		 33°C
(92°F)		 33°C
(92°F)		 32°C
(90°F)		 32°C
(90°F)		 29°C
(85°F)		 18°C
(65°F)		 16°C
(60°F)
Average high -3°C
(28°F)		 -2°C
(29°F)		 7°C
(46°F)		 14°C
(57°F)		 21°C
(71°F)		 28°C
(82°F)		 28°C
(84°F)		 27°C
(81°F)		 25°C
(77°F)		 16°C
(60°F)		 7°C
(45°F)		 3°C
(37°F)
Daily mean -7°C
(20°F)		 -6°C
(21°F)		 3°C
(37°F)		 8°C
(47°F)		 16°C
(61°F)		 23°C
(73°F)		 24°C
(75°F)		 22°C
(72°F)		 19°C
(67°F)		 11°C
(51°F)		 2°C
(37°F)		 -2°C
(29°F)
Average low -11°C
(13°F)		 -11°C
(12°F)		 -2°C
(29°F)		 3°C
(37°F)		 11°C
(52°F)		 17°C
(63°F)		 19°C
(66°F)		 17°C
(62°F)		 14°C
(57°F)		 6°C
(43°F)		 -2°C
(28°F)		 -6°C
(22°F)
Mean minimum -25°C
(-12°F)		 -25°C
(-13°F)		 -14°C
(7°F)		 -7°C
(20°F)		 3°C
(37°F)		 11°C
(52°F)		 14°C
(57°F)		 11°C
(52°F)		 6°C
(43°F)		 -4°C
(25°F)		 -12°C
(10°F)		 -17°C
(3°F)
Minimum -33°C
(-26°F)		 -34°C
(-28°F)		 -23°C
(-9°F)		 -12°C
(11°F)		 -1°C
(31°F)		 9°C
(48°F)		 12°C
(54°F)		 10°C
(50°F)		 3°C
(37°F)		 -7°C
(20°F)		 -17°C
(1°F)		 -22°C
(-8°F)

Compare climate in Ackley with other places

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

Monthly average precipitation in Ackley, Iowa, United States §

Ackley usually has the most precipitation in May, June and October, with an average of 12 rainy days and 132 mm (5.2 inches) of precipitation per month.The driest months in Ackley are January, November and December. On average, 40 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Ackley, 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) 48 (1.9) 72 (2.8) 83 (3.3) 149 (5.9) 121 (4.8) 104 (4.1) 95 (3.7) 117 (4.6) 126 (5.0) 47 (1.8) 34 (1.3)
Average precipitation days (≥ 1 mm) 6 8 8 10 15 12 10 9 9 11 7 5

Monthly sunshine hours in Ackley, Iowa, United States §

The sunniest months in Ackley are June, July and August, when the sun shines an average of 11 hours 23 minutes a day.Least sunny months in Ackley: January, February and December receive an average of 5 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Ackley, 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 137 191 228 250 258 345 371 330 268 225 205 203
Mean daily daylight hours 9h 26m 10h 33m 11h 58m 13h 24m 14h 38m 15h 14m 14h 54m 13h 49m 12h 25m 10h 59m 9h 44m 9h 5m

Solar UV radiation in Ackley, Iowa, United States §

Ackley 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 3. For more detailed information, check out our hourly Ackley UV Index data.

Average daily maximum UV levels by month for Ackley, 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 3 3