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Monthly climate in Jacksonville, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Jacksonville features a humid continental climate (Dfa).Temperatures typically range between -2 °C (29 °F) and 25 °C (78 °F) through the year, but rarely can drop to -26 °C (-14 °F) or can rise to as high as 35 °C (96 °F).The average annual precipitation amounts to about 1138 mm (44.8 inches) and receives 119 rainy days on the 1 mm (0.04 inches) threshold annually.Jacksonville enjoys an average of 2991 hours of sunshine throughout the year, and daylight varies from 9 hours 24 minutes to 14 hours 54 minutes per day.

Monthly average temperatures in Jacksonville, Illinois, United States §

The warmest months in Jacksonville are June, July and August, with daily mean temperatures ranging from 24 to 25 °C (75 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 2 °C (29 - 37 °F) throughout the day. On average each year, Jacksonville experiences 112 days above 25 °C (77.0 °F) and 91 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Jacksonville, 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 17°C
(63°F)		 23°C
(74°F)		 25°C
(77°F)		 29°C
(84°F)		 35°C
(95°F)		 35°C
(95°F)		 35°C
(96°F)		 34°C
(93°F)		 34°C
(94°F)		 32°C
(90°F)		 24°C
(75°F)		 21°C
(70°F)
Mean maximum 14°C
(58°F)		 18°C
(64°F)		 22°C
(71°F)		 28°C
(83°F)		 32°C
(90°F)		 33°C
(92°F)		 34°C
(94°F)		 33°C
(91°F)		 33°C
(91°F)		 31°C
(87°F)		 20°C
(68°F)		 18°C
(65°F)
Average high 2°C
(37°F)		 5°C
(41°F)		 12°C
(53°F)		 17°C
(63°F)		 24°C
(75°F)		 29°C
(84°F)		 30°C
(86°F)		 29°C
(84°F)		 27°C
(82°F)		 19°C
(67°F)		 10°C
(51°F)		 7°C
(45°F)
Daily mean -2°C
(29°F)		 -0°C
(32°F)		 7°C
(44°F)		 11°C
(53°F)		 19°C
(66°F)		 24°C
(75°F)		 25°C
(78°F)		 24°C
(75°F)		 22°C
(71°F)		 14°C
(57°F)		 6°C
(42°F)		 2°C
(37°F)
Average low -6°C
(22°F)		 -5°C
(24°F)		 2°C
(36°F)		 6°C
(43°F)		 14°C
(57°F)		 19°C
(66°F)		 21°C
(69°F)		 19°C
(66°F)		 16°C
(61°F)		 9°C
(49°F)		 1°C
(34°F)		 -2°C
(28°F)
Mean minimum -19°C
(-1°F)		 -18°C
(-0°F)		 -10°C
(15°F)		 -2°C
(28°F)		 5°C
(41°F)		 14°C
(57°F)		 16°C
(60°F)		 13°C
(56°F)		 8°C
(47°F)		 -1°C
(31°F)		 -8°C
(17°F)		 -12°C
(11°F)
Minimum -26°C
(-14°F)		 -22°C
(-8°F)		 -17°C
(1°F)		 -7°C
(20°F)		 1°C
(34°F)		 10°C
(51°F)		 14°C
(57°F)		 12°C
(54°F)		 6°C
(43°F)		 -4°C
(25°F)		 -13°C
(8°F)		 -19°C
(-2°F)

Compare climate in Jacksonville with other places

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

Monthly average precipitation in Jacksonville, Illinois, United States §

Jacksonville usually has the most precipitation in March, May and June, with an average of 12 rainy days and 137 mm (5.4 inches) of precipitation per month.The driest months in Jacksonville are February, September and December. On average, 59 mm (2.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Jacksonville, 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) 67 (2.6) 64 (2.5) 137 (5.4) 123 (4.8) 150 (5.9) 123 (4.9) 103 (4.0) 91 (3.6) 64 (2.5) 102 (4.0) 66 (2.6) 48 (1.9)
Average precipitation days (≥ 1 mm) 7 10 11 11 15 11 10 11 7 10 9 7

Monthly sunshine hours in Jacksonville, Illinois, United States §

The sunniest months in Jacksonville are June, July and August, when the sun shines an average of 11 hours 4 minutes a day.Least sunny months in Jacksonville: 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 Jacksonville, 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 122 175 209 242 286 332 351 334 292 235 207 200
Mean daily daylight hours 9h 43m 10h 42m 11h 58m 13h 16m 14h 22m 14h 54m 14h 36m 13h 38m 12h 23m 11h 6m 9h 58m 9h 24m

Solar UV radiation in Jacksonville, Illinois, United States §

Jacksonville 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 Jacksonville UV Index data.

Average daily maximum UV levels by month for Jacksonville, 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 11 9 9 6 4 3