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Monthly climate in Sully, Iowa, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Sully features a humid continental climate (Dfa). Temperatures typically range between -5 °C (23 °F) and 25 °C (77 °F) through the year, but rarely can drop to -31 °C (-24 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 1022 mm (40.2 inches) and receives 105 rainy days on the 1 mm (0.04 inches) threshold annually. Sully enjoys an average of 3032 hours of sunshine throughout the year, and daylight varies from 9 hours 12 minutes to 15 hours 6 minutes per day.

Monthly average temperatures in Sully, Iowa, United States §

The warmest months in Sully 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 (23 - 31 °F) throughout the day. On average each year, Sully experiences 98 days above 25 °C (77.0 °F) and 118 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sully, 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
(57°F)		 22°C
(72°F)		 23°C
(73°F)		 29°C
(85°F)		 35°C
(95°F)		 37°C
(99°F)		 35°C
(96°F)		 36°C
(96°F)		 33°C
(92°F)		 31°C
(88°F)		 24°C
(76°F)		 23°C
(73°F)
Mean maximum 11°C
(52°F)		 15°C
(59°F)		 21°C
(69°F)		 27°C
(80°F)		 32°C
(90°F)		 34°C
(93°F)		 34°C
(94°F)		 33°C
(92°F)		 32°C
(90°F)		 30°C
(86°F)		 19°C
(66°F)		 17°C
(63°F)
Average high -1°C
(31°F)		 1°C
(33°F)		 9°C
(49°F)		 15°C
(60°F)		 22°C
(72°F)		 28°C
(83°F)		 30°C
(85°F)		 28°C
(83°F)		 26°C
(79°F)		 17°C
(62°F)		 9°C
(48°F)		 4°C
(40°F)
Daily mean -5°C
(23°F)		 -4°C
(24°F)		 4°C
(40°F)		 10°C
(50°F)		 17°C
(63°F)		 23°C
(74°F)		 25°C
(77°F)		 23°C
(74°F)		 20°C
(69°F)		 12°C
(53°F)		 4°C
(39°F)		 -0°C
(31°F)
Average low -10°C
(15°F)		 -9°C
(16°F)		 -0°C
(32°F)		 4°C
(40°F)		 12°C
(54°F)		 18°C
(65°F)		 20°C
(68°F)		 18°C
(64°F)		 15°C
(59°F)		 7°C
(45°F)		 -1°C
(30°F)		 -5°C
(23°F)
Mean minimum -24°C
(-12°F)		 -23°C
(-8°F)		 -12°C
(11°F)		 -6°C
(22°F)		 4°C
(40°F)		 12°C
(54°F)		 15°C
(59°F)		 12°C
(54°F)		 7°C
(45°F)		 -3°C
(27°F)		 -11°C
(13°F)		 -15°C
(5°F)
Minimum -30°C
(-22°F)		 -31°C
(-24°F)		 -22°C
(-6°F)		 -10°C
(14°F)		 1°C
(35°F)		 9°C
(49°F)		 13°C
(56°F)		 11°C
(52°F)		 5°C
(41°F)		 -5°C
(24°F)		 -17°C
(2°F)		 -23°C
(-8°F)

Compare climate in Sully with other places

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

Monthly average precipitation in Sully, Iowa, United States §

Sully usually has the most precipitation in May, June and October, with an average of 12 rainy days and 142 mm (5.6 inches) of precipitation per month. The driest months in Sully 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 Sully, 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) 44 (1.7) 49 (1.9) 83 (3.3) 74 (2.9) 163 (6.4) 124 (4.9) 72 (2.8) 65 (2.5) 121 (4.8) 137 (5.4) 49 (1.9) 40 (1.6)
Average precipitation days (≥ 1 mm) 7 8 8 10 15 10 9 7 8 11 7 5

Monthly sunshine hours in Sully, Iowa, United States §

The sunniest months in Sully are June, July and August, when the sun shines an average of 11 hours 25 minutes a day. Least sunny months in Sully: January, February and December receive an average of 5 hours 49 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sully, 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 135 189 223 253 263 341 372 336 277 225 207 205
Mean daily daylight hours 9h 33m 10h 37m 11h 58m 13h 21m 14h 31m 15h 6m 14h 47m 13h 44m 12h 24m 11h 2m 9h 49m 9h 12m

Solar UV radiation in Sully, Iowa, United States §

Sully 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 4. For more detailed information, check out our hourly Sully UV Index data.

Average daily maximum UV levels by month for Sully, 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 4 3

Detailed Monthly Weather Insights for Sully, Iowa, United States

Discover in-depth weather details for every month in Sully. 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 Sully'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.