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Monthly climate in Onawa, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Onawa 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 -33 °C (-27 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 900 mm (35.4 inches) and receives 94 rainy days on the 1 mm (0.04 inches) threshold annually.Onawa enjoys an average of 3075 hours of sunshine throughout the year, and daylight varies from 9 hours 9 minutes to 15 hours 10 minutes per day.

Monthly average temperatures in Onawa, Iowa, United States §

The warmest months in Onawa 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 - 30 °F) throughout the day. On average each year, Onawa experiences 99 days above 25 °C (77.0 °F) and 124 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Onawa, 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)		 21°C
(71°F)		 25°C
(77°F)		 30°C
(85°F)		 36°C
(96°F)		 38°C
(101°F)		 35°C
(95°F)		 36°C
(97°F)		 36°C
(97°F)		 31°C
(89°F)		 27°C
(80°F)		 21°C
(70°F)
Mean maximum 10°C
(51°F)		 14°C
(58°F)		 22°C
(72°F)		 27°C
(81°F)		 32°C
(91°F)		 34°C
(93°F)		 35°C
(95°F)		 33°C
(91°F)		 33°C
(92°F)		 30°C
(86°F)		 20°C
(67°F)		 14°C
(58°F)
Average high 0°C
(33°F)		 1°C
(34°F)		 10°C
(50°F)		 15°C
(60°F)		 22°C
(71°F)		 29°C
(85°F)		 30°C
(86°F)		 28°C
(83°F)		 26°C
(79°F)		 16°C
(62°F)		 9°C
(49°F)		 4°C
(39°F)
Daily mean -5°C
(24°F)		 -5°C
(24°F)		 4°C
(40°F)		 9°C
(49°F)		 16°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
(30°F)
Average low -9°C
(16°F)		 -10°C
(15°F)		 -1°C
(31°F)		 3°C
(38°F)		 11°C
(53°F)		 18°C
(65°F)		 20°C
(68°F)		 18°C
(64°F)		 15°C
(58°F)		 6°C
(43°F)		 -2°C
(29°F)		 -6°C
(22°F)
Mean minimum -22°C
(-8°F)		 -22°C
(-7°F)		 -11°C
(12°F)		 -6°C
(21°F)		 4°C
(39°F)		 12°C
(53°F)		 13°C
(56°F)		 11°C
(52°F)		 6°C
(43°F)		 -4°C
(26°F)		 -10°C
(14°F)		 -16°C
(3°F)
Minimum -30°C
(-22°F)		 -33°C
(-27°F)		 -21°C
(-5°F)		 -10°C
(13°F)		 2°C
(35°F)		 9°C
(48°F)		 12°C
(54°F)		 10°C
(50°F)		 4°C
(39°F)		 -7°C
(19°F)		 -15°C
(5°F)		 -23°C
(-9°F)

Compare climate in Onawa with other places

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

Monthly average precipitation in Onawa, Iowa, United States §

Onawa usually has the most precipitation in May, June and August, with an average of 10 rainy days and 122 mm (4.8 inches) of precipitation per month.The driest months in Onawa are January, February and November. On average, 30 mm (1.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Onawa, 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) 27 (1.1) 33 (1.3) 83 (3.3) 71 (2.8) 142 (5.6) 114 (4.5) 64 (2.5) 110 (4.3) 91 (3.6) 94 (3.7) 29 (1.1) 40 (1.6)
Average precipitation days (≥ 1 mm) 4 6 9 10 15 9 6 8 8 10 5 4

Monthly sunshine hours in Onawa, Iowa, United States §

The sunniest months in Onawa are June, July and August, when the sun shines an average of 11 hours 22 minutes a day.Least sunny months in Onawa: January, February and November receive an average of 6 hours 17 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Onawa, 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 150 202 217 256 264 348 374 323 276 231 213 214
Mean daily daylight hours 9h 30m 10h 35m 11h 58m 13h 23m 14h 34m 15h 10m 14h 50m 13h 46m 12h 25m 11h 0m 9h 47m 9h 9m

Solar UV radiation in Onawa, Iowa, United States §

Onawa 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, February 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 Onawa UV Index data.

Average daily maximum UV levels by month for Onawa, 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 4 5 8 9 11 10 9 8 6 4 2