nomadseason

Monthly climate in Sumner, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sumner features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (33 °F) and 26 °C (80 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 36 °C (98 °F).The average annual precipitation amounts to about 1251 mm (49.3 inches) and receives 126 rainy days on the 1 mm (0.04 inches) threshold annually.Sumner enjoys an average of 2908 hours of sunshine throughout the year, and daylight varies from 9 hours 29 minutes to 14 hours 49 minutes per day.

Monthly average temperatures in Sumner, Illinois, United States §

The warmest months in Sumner are June, July and August, with daily mean temperatures ranging from 25 to 26 °C (77 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 4 °C (33 - 39 °F) throughout the day. On average each year, Sumner experiences 122 days above 25 °C (77.0 °F) and 76 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sumner, Illinois, 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 20°C
(68°F)		 24°C
(75°F)		 24°C
(75°F)		 29°C
(85°F)		 35°C
(95°F)		 36°C
(96°F)		 36°C
(98°F)		 35°C
(96°F)		 34°C
(94°F)		 34°C
(94°F)		 26°C
(80°F)		 20°C
(69°F)
Mean maximum 16°C
(62°F)		 19°C
(67°F)		 22°C
(72°F)		 28°C
(83°F)		 32°C
(90°F)		 34°C
(93°F)		 35°C
(96°F)		 34°C
(93°F)		 33°C
(92°F)		 31°C
(88°F)		 22°C
(71°F)		 19°C
(66°F)
Average high 4°C
(40°F)		 7°C
(45°F)		 13°C
(56°F)		 18°C
(65°F)		 25°C
(77°F)		 30°C
(86°F)		 31°C
(88°F)		 29°C
(85°F)		 28°C
(83°F)		 21°C
(70°F)		 11°C
(53°F)		 9°C
(48°F)
Daily mean 1°C
(33°F)		 2°C
(37°F)		 8°C
(47°F)		 13°C
(56°F)		 20°C
(68°F)		 25°C
(77°F)		 26°C
(80°F)		 25°C
(77°F)		 22°C
(73°F)		 16°C
(60°F)		 7°C
(44°F)		 4°C
(39°F)
Average low -3°C
(26°F)		 -2°C
(29°F)		 3°C
(38°F)		 8°C
(46°F)		 15°C
(59°F)		 20°C
(68°F)		 22°C
(71°F)		 20°C
(68°F)		 17°C
(63°F)		 10°C
(51°F)		 2°C
(35°F)		 -0°C
(31°F)
Mean minimum -15°C
(5°F)		 -15°C
(6°F)		 -8°C
(18°F)		 -2°C
(29°F)		 5°C
(41°F)		 14°C
(58°F)		 16°C
(61°F)		 14°C
(57°F)		 9°C
(48°F)		 1°C
(34°F)		 -7°C
(20°F)		 -11°C
(13°F)
Minimum -20°C
(-4°F)		 -17°C
(1°F)		 -15°C
(6°F)		 -4°C
(25°F)		 2°C
(35°F)		 10°C
(50°F)		 14°C
(58°F)		 13°C
(55°F)		 8°C
(47°F)		 -3°C
(27°F)		 -12°C
(11°F)		 -17°C
(1°F)

Compare climate in Sumner with other places

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

Monthly average precipitation in Sumner, Illinois, United States §

Sumner usually has the most precipitation in March, April and May, with an average of 13 rainy days and 129 mm (5.1 inches) of precipitation per month.The driest months in Sumner are January, August and September. On average, 84 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sumner, Illinois, 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) 91 (3.6) 107 (4.2) 133 (5.2) 120 (4.7) 133 (5.3) 112 (4.4) 97 (3.8) 92 (3.6) 70 (2.7) 100 (3.9) 102 (4.0) 95 (3.7)
Average precipitation days (≥ 1 mm) 9 10 13 11 15 11 11 10 7 10 10 9

Monthly sunshine hours in Sumner, Illinois, United States §

The sunniest months in Sumner are June, July and August, when the sun shines an average of 10 hours 49 minutes a day.Least sunny months in Sumner: January, February and December receive an average of 5 hours 0 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sumner, Illinois, 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 118 156 208 247 275 325 350 320 289 236 199 179
Mean daily daylight hours 9h 47m 10h 45m 11h 58m 13h 14m 14h 17m 14h 49m 14h 31m 13h 35m 12h 23m 11h 8m 10h 2m 9h 29m

Solar UV radiation in Sumner, Illinois, United States §

Sumner 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 Sumner UV Index data.

Average daily maximum UV levels by month for Sumner, Illinois, 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 7 9 10 11 10 9 9 6 4 3