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Monthly climate in Evanston, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Evanston features a humid continental climate (Dfa).Temperatures typically range between -3 °C (27 °F) and 23 °C (74 °F) through the year, but rarely can drop to -30 °C (-21 °F) or can rise to as high as 33 °C (92 °F).The average annual precipitation amounts to about 1119 mm (44.0 inches) and receives 133 rainy days on the 1 mm (0.04 inches) threshold annually.Evanston enjoys an average of 2944 hours of sunshine throughout the year, and daylight varies from 9 hours 10 minutes to 15 hours 9 minutes per day.

Monthly average temperatures in Evanston, Illinois, United States §

The warmest months in Evanston are June, July and August, with daily mean temperatures ranging from 20 to 23 °C (68 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to 1 °C (27 - 34 °F) throughout the day. On average each year, Evanston experiences 62 days above 25 °C (77.0 °F) and 95 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Evanston, 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 13°C
(56°F)		 18°C
(65°F)		 22°C
(72°F)		 25°C
(78°F)		 30°C
(86°F)		 32°C
(89°F)		 33°C
(92°F)		 33°C
(92°F)		 31°C
(88°F)		 29°C
(84°F)		 22°C
(71°F)		 18°C
(65°F)
Mean maximum 10°C
(49°F)		 12°C
(54°F)		 18°C
(64°F)		 23°C
(74°F)		 27°C
(81°F)		 30°C
(86°F)		 32°C
(89°F)		 31°C
(89°F)		 30°C
(87°F)		 27°C
(81°F)		 16°C
(62°F)		 14°C
(58°F)
Average high 0°C
(32°F)		 2°C
(35°F)		 7°C
(45°F)		 11°C
(53°F)		 17°C
(64°F)		 24°C
(75°F)		 27°C
(80°F)		 26°C
(80°F)		 24°C
(75°F)		 16°C
(62°F)		 8°C
(46°F)		 4°C
(40°F)
Daily mean -3°C
(27°F)		 -2°C
(29°F)		 3°C
(38°F)		 8°C
(46°F)		 14°C
(57°F)		 20°C
(68°F)		 23°C
(74°F)		 23°C
(73°F)		 20°C
(68°F)		 13°C
(55°F)		 4°C
(40°F)		 1°C
(34°F)
Average low -6°C
(22°F)		 -6°C
(22°F)		 -0°C
(32°F)		 4°C
(39°F)		 10°C
(50°F)		 16°C
(61°F)		 20°C
(68°F)		 19°C
(67°F)		 16°C
(61°F)		 9°C
(49°F)		 1°C
(35°F)		 -2°C
(29°F)
Mean minimum -19°C
(-2°F)		 -19°C
(-1°F)		 -10°C
(15°F)		 -2°C
(28°F)		 3°C
(38°F)		 12°C
(54°F)		 15°C
(60°F)		 14°C
(58°F)		 10°C
(50°F)		 2°C
(36°F)		 -7°C
(20°F)		 -11°C
(12°F)
Minimum -29°C
(-20°F)		 -30°C
(-21°F)		 -19°C
(-2°F)		 -6°C
(21°F)		 -1°C
(31°F)		 9°C
(49°F)		 14°C
(58°F)		 12°C
(54°F)		 6°C
(44°F)		 -0°C
(32°F)		 -12°C
(11°F)		 -18°C
(-1°F)

Compare climate in Evanston with other places

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

Monthly average precipitation in Evanston, Illinois, United States §

Evanston usually has the most precipitation in May, June and October, with an average of 13 rainy days and 138 mm (5.4 inches) of precipitation per month.The driest months in Evanston are January, November and December. On average, 62 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Evanston, 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) 66 (2.6) 66 (2.6) 82 (3.2) 116 (4.6) 159 (6.2) 123 (4.8) 94 (3.7) 80 (3.2) 79 (3.1) 134 (5.3) 62 (2.4) 58 (2.3)
Average precipitation days (≥ 1 mm) 9 12 11 12 14 12 12 11 10 14 8 8

Monthly sunshine hours in Evanston, Illinois, United States §

The sunniest months in Evanston are June, July and August, when the sun shines an average of 11 hours 14 minutes a day.Least sunny months in Evanston: January, February and December receive an average of 4 hours 56 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Evanston, 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 111 172 234 250 286 330 361 341 282 221 185 166
Mean daily daylight hours 9h 30m 10h 35m 11h 58m 13h 22m 14h 34m 15h 9m 14h 50m 13h 46m 12h 25m 11h 1m 9h 47m 9h 10m

Solar UV radiation in Evanston, Illinois, United States §

Evanston experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Evanston UV Index data.

Average daily maximum UV levels by month for Evanston, 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 4 6 8 9 10 10 9 8 6 3 2