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Monthly climate in Seymour, Iowa, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Seymour features a humid continental climate (Dfa). Temperatures typically range between -4 °C (25 °F) and 26 °C (78 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 38 °C (102 °F). The average annual precipitation amounts to about 1051 mm (41.4 inches) and receives 107 rainy days on the 1 mm (0.04 inches) threshold annually. Seymour enjoys an average of 3019 hours of sunshine throughout the year, and daylight varies from 9 hours 17 minutes to 15 hours 1 minutes per day.

Monthly average temperatures in Seymour, Iowa, United States §

The warmest months in Seymour are June, July and August, with daily mean temperatures ranging from 24 to 26 °C (75 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to 0 °C (25 - 33 °F) throughout the day. On average each year, Seymour experiences 101 days above 25 °C (77.0 °F) and 109 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Seymour, 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
(73°F)		 29°C
(85°F)		 38°C
(101°F)		 38°C
(102°F)		 38°C
(100°F)		 37°C
(99°F)		 33°C
(92°F)		 31°C
(88°F)		 23°C
(74°F)		 23°C
(73°F)
Mean maximum 12°C
(54°F)		 16°C
(62°F)		 21°C
(70°F)		 27°C
(80°F)		 32°C
(90°F)		 34°C
(94°F)		 35°C
(95°F)		 34°C
(93°F)		 32°C
(90°F)		 29°C
(85°F)		 19°C
(66°F)		 17°C
(63°F)
Average high 0°C
(33°F)		 2°C
(36°F)		 10°C
(51°F)		 16°C
(61°F)		 22°C
(73°F)		 29°C
(85°F)		 31°C
(87°F)		 29°C
(84°F)		 26°C
(79°F)		 17°C
(63°F)		 9°C
(49°F)		 5°C
(42°F)
Daily mean -4°C
(25°F)		 -3°C
(27°F)		 5°C
(42°F)		 10°C
(51°F)		 17°C
(64°F)		 24°C
(75°F)		 26°C
(78°F)		 24°C
(75°F)		 21°C
(69°F)		 12°C
(54°F)		 4°C
(40°F)		 0°C
(33°F)
Average low -9°C
(17°F)		 -8°C
(18°F)		 1°C
(33°F)		 5°C
(41°F)		 13°C
(55°F)		 19°C
(66°F)		 21°C
(70°F)		 18°C
(65°F)		 15°C
(60°F)		 7°C
(46°F)		 -1°C
(31°F)		 -4°C
(25°F)
Mean minimum -24°C
(-11°F)		 -21°C
(-5°F)		 -11°C
(13°F)		 -5°C
(23°F)		 5°C
(41°F)		 13°C
(56°F)		 16°C
(61°F)		 13°C
(56°F)		 8°C
(47°F)		 -2°C
(28°F)		 -11°C
(13°F)		 -14°C
(6°F)
Minimum -30°C
(-22°F)		 -28°C
(-18°F)		 -19°C
(-3°F)		 -9°C
(15°F)		 2°C
(36°F)		 11°C
(52°F)		 14°C
(58°F)		 11°C
(53°F)		 7°C
(45°F)		 -4°C
(25°F)		 -16°C
(3°F)		 -25°C
(-13°F)

Compare climate in Seymour with other places

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

Monthly average precipitation in Seymour, Iowa, United States §

Seymour usually has the most precipitation in May, September and October, with an average of 11 rainy days and 134 mm (5.3 inches) of precipitation per month. The driest months in Seymour are January, February and December. On average, 44 mm (1.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Seymour, 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) 48 (1.9) 49 (1.9) 98 (3.9) 75 (3.0) 145 (5.7) 122 (4.8) 89 (3.5) 78 (3.1) 125 (4.9) 132 (5.2) 53 (2.1) 35 (1.4)
Average precipitation days (≥ 1 mm) 6 8 11 10 15 11 9 8 8 11 6 4

Monthly sunshine hours in Seymour, Iowa, United States §

The sunniest months in Seymour are June, July and August, when the sun shines an average of 11 hours 15 minutes a day. Least sunny months in Seymour: January, February and November receive an average of 5 hours 52 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Seymour, 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 134 188 213 256 264 338 363 333 278 232 206 209
Mean daily daylight hours 9h 37m 10h 39m 11h 58m 13h 19m 14h 27m 15h 1m 14h 42m 13h 42m 12h 24m 11h 3m 9h 53m 9h 17m

Solar UV radiation in Seymour, Iowa, United States §

Seymour 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 Seymour UV Index data.

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

Detailed Monthly Weather Insights for Seymour, Iowa, United States

Discover in-depth weather details for every month in Seymour. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Seymour's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.