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Monthly climate in Sparta, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sparta features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (34 °F) and 27 °C (80 °F) through the year, but rarely can drop to -19 °C (-2 °F) or can rise to as high as 38 °C (100 °F).The average annual precipitation amounts to about 1261 mm (49.6 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually.Sparta enjoys an average of 3002 hours of sunshine throughout the year, and daylight varies from 9 hours 33 minutes to 14 hours 44 minutes per day.

Monthly average temperatures in Sparta, Illinois, United States §

The warmest months in Sparta are June, July and August, with daily mean temperatures ranging from 25 to 27 °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 5 °C (34 - 41 °F) throughout the day. On average each year, Sparta experiences 125 days above 25 °C (77.0 °F) and 68 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sparta, 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 21°C
(69°F)		 25°C
(78°F)		 27°C
(81°F)		 31°C
(88°F)		 34°C
(93°F)		 36°C
(96°F)		 38°C
(100°F)		 37°C
(98°F)		 35°C
(95°F)		 35°C
(95°F)		 25°C
(77°F)		 24°C
(75°F)
Mean maximum 17°C
(63°F)		 21°C
(70°F)		 25°C
(77°F)		 28°C
(83°F)		 32°C
(90°F)		 34°C
(93°F)		 36°C
(97°F)		 35°C
(95°F)		 34°C
(93°F)		 32°C
(90°F)		 23°C
(73°F)		 20°C
(69°F)
Average high 5°C
(42°F)		 8°C
(47°F)		 14°C
(58°F)		 19°C
(66°F)		 25°C
(77°F)		 30°C
(86°F)		 32°C
(89°F)		 30°C
(86°F)		 28°C
(83°F)		 21°C
(70°F)		 13°C
(55°F)		 10°C
(50°F)
Daily mean 1°C
(34°F)		 3°C
(38°F)		 9°C
(48°F)		 13°C
(56°F)		 20°C
(68°F)		 25°C
(77°F)		 27°C
(80°F)		 25°C
(77°F)		 23°C
(73°F)		 16°C
(60°F)		 7°C
(45°F)		 5°C
(41°F)
Average low -3°C
(28°F)		 -2°C
(29°F)		 4°C
(40°F)		 8°C
(47°F)		 15°C
(60°F)		 20°C
(68°F)		 22°C
(72°F)		 20°C
(69°F)		 17°C
(63°F)		 10°C
(51°F)		 2°C
(36°F)		 0°C
(33°F)
Mean minimum -14°C
(7°F)		 -14°C
(8°F)		 -7°C
(20°F)		 -0°C
(32°F)		 7°C
(44°F)		 15°C
(60°F)		 17°C
(64°F)		 15°C
(59°F)		 9°C
(49°F)		 0°C
(33°F)		 -6°C
(22°F)		 -9°C
(16°F)
Minimum -19°C
(-1°F)		 -19°C
(-2°F)		 -15°C
(6°F)		 -3°C
(27°F)		 3°C
(38°F)		 12°C
(53°F)		 16°C
(62°F)		 13°C
(55°F)		 8°C
(46°F)		 -3°C
(28°F)		 -11°C
(12°F)		 -15°C
(5°F)

Compare climate in Sparta with other places

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

Monthly average precipitation in Sparta, Illinois, United States §

Sparta usually has the most precipitation in March, April and May, with an average of 12 rainy days and 146 mm (5.7 inches) of precipitation per month.The driest months in Sparta are September, November and December. On average, 75 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sparta, 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) 88 (3.5) 108 (4.2) 136 (5.3) 144 (5.7) 157 (6.2) 87 (3.4) 88 (3.5) 103 (4.1) 64 (2.5) 125 (4.9) 84 (3.3) 77 (3.0)
Average precipitation days (≥ 1 mm) 8 10 12 12 14 11 10 11 6 10 10 7

Monthly sunshine hours in Sparta, Illinois, United States §

The sunniest months in Sparta are June, July and August, when the sun shines an average of 10 hours 57 minutes a day.Least sunny months in Sparta: January, February and December receive an average of 5 hours 28 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sparta, 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 128 178 205 247 290 328 352 327 291 243 216 191
Mean daily daylight hours 9h 51m 10h 47m 11h 58m 13h 12m 14h 14m 14h 44m 14h 28m 13h 33m 12h 22m 11h 9m 10h 5m 9h 33m

Solar UV radiation in Sparta, Illinois, United States §

Sparta experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Sparta UV Index data.

Average daily maximum UV levels by month for Sparta, 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 11 11 10 10 9 7 5 3