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Monthly climate in Dayton, Iowa, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Dayton features a humid continental climate (Dfa).Temperatures typically range between -6 °C (21 °F) and 24 °C (76 °F) through the year, but rarely can drop to -31 °C (-23 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 1006 mm (39.6 inches) and receives 109 rainy days on the 1 mm (0.04 inches) threshold annually.Dayton enjoys an average of 3010 hours of sunshine throughout the year, and daylight varies from 9 hours 7 minutes to 15 hours 12 minutes per day.

Monthly average temperatures in Dayton, Iowa, United States §

The warmest months in Dayton are June, July and August, with daily mean temperatures ranging from 23 to 24 °C (73 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -2 °C (21 - 29 °F) throughout the day. On average each year, Dayton experiences 93 days above 25 °C (77.0 °F) and 129 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Dayton, 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
(70°F)		 24°C
(75°F)		 30°C
(87°F)		 36°C
(96°F)		 38°C
(101°F)		 35°C
(96°F)		 37°C
(100°F)		 35°C
(95°F)		 31°C
(89°F)		 26°C
(78°F)		 22°C
(71°F)
Mean maximum 11°C
(51°F)		 13°C
(56°F)		 21°C
(69°F)		 26°C
(79°F)		 32°C
(90°F)		 34°C
(93°F)		 34°C
(94°F)		 33°C
(91°F)		 33°C
(91°F)		 30°C
(86°F)		 19°C
(66°F)		 16°C
(61°F)
Average high -2°C
(29°F)		 -1°C
(30°F)		 8°C
(47°F)		 15°C
(58°F)		 22°C
(71°F)		 28°C
(83°F)		 29°C
(85°F)		 28°C
(82°F)		 25°C
(78°F)		 16°C
(61°F)		 8°C
(47°F)		 3°C
(38°F)
Daily mean -6°C
(21°F)		 -6°C
(21°F)		 3°C
(38°F)		 9°C
(48°F)		 16°C
(62°F)		 23°C
(74°F)		 24°C
(76°F)		 23°C
(73°F)		 20°C
(68°F)		 11°C
(51°F)		 3°C
(37°F)		 -2°C
(29°F)
Average low -10°C
(14°F)		 -11°C
(12°F)		 -1°C
(30°F)		 3°C
(38°F)		 11°C
(53°F)		 18°C
(64°F)		 19°C
(67°F)		 17°C
(63°F)		 14°C
(58°F)		 6°C
(42°F)		 -2°C
(28°F)		 -6°C
(21°F)
Mean minimum -24°C
(-11°F)		 -25°C
(-12°F)		 -12°C
(10°F)		 -7°C
(20°F)		 3°C
(38°F)		 11°C
(53°F)		 14°C
(57°F)		 12°C
(53°F)		 6°C
(44°F)		 -3°C
(26°F)		 -12°C
(10°F)		 -16°C
(3°F)
Minimum -31°C
(-23°F)		 -30°C
(-22°F)		 -22°C
(-7°F)		 -12°C
(11°F)		 0°C
(33°F)		 8°C
(47°F)		 12°C
(55°F)		 10°C
(50°F)		 4°C
(39°F)		 -7°C
(20°F)		 -20°C
(-4°F)		 -23°C
(-9°F)

Compare climate in Dayton with other places

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

Monthly average precipitation in Dayton, Iowa, United States §

Dayton usually has the most precipitation in May, September and October, with an average of 11 rainy days and 138 mm (5.5 inches) of precipitation per month.The driest months in Dayton are January, November and December. On average, 37 mm (1.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Dayton, 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) 32 (1.3) 42 (1.7) 72 (2.8) 72 (2.8) 166 (6.5) 109 (4.3) 89 (3.5) 95 (3.8) 127 (5.0) 123 (4.8) 41 (1.6) 37 (1.5)
Average precipitation days (≥ 1 mm) 6 7 9 10 15 12 9 11 9 9 7 5

Monthly sunshine hours in Dayton, Iowa, United States §

The sunniest months in Dayton are June, July and August, when the sun shines an average of 11 hours 19 minutes a day.Least sunny months in Dayton: January, February and December receive an average of 5 hours 55 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Dayton, 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 139 193 224 250 255 341 372 327 268 221 208 205
Mean daily daylight hours 9h 28m 10h 34m 11h 58m 13h 23m 14h 36m 15h 12m 14h 52m 13h 47m 12h 25m 11h 0m 9h 45m 9h 7m

Solar UV radiation in Dayton, Iowa, United States §

Dayton 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 Dayton UV Index data.

Average daily maximum UV levels by month for Dayton, 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 5 8 9 11 10 9 8 6 3 3