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Monthly climate in Forrest, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Forrest features a humid continental climate (Dfa).Temperatures typically range between -3 °C (27 °F) and 25 °C (77 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 35 °C (96 °F).The average annual precipitation amounts to about 1131 mm (44.5 inches) and receives 129 rainy days on the 1 mm (0.04 inches) threshold annually.Forrest enjoys an average of 2923 hours of sunshine throughout the year, and daylight varies from 9 hours 17 minutes to 15 hours 2 minutes per day.

Monthly average temperatures in Forrest, Illinois, United States §

The warmest months in Forrest 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 -3 to 1 °C (27 - 35 °F) throughout the day. On average each year, Forrest experiences 102 days above 25 °C (77.0 °F) and 102 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Forrest, 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
(62°F)		 22°C
(73°F)		 26°C
(79°F)		 29°C
(85°F)		 35°C
(95°F)		 34°C
(94°F)		 35°C
(95°F)		 35°C
(96°F)		 35°C
(94°F)		 32°C
(89°F)		 25°C
(77°F)		 19°C
(67°F)
Mean maximum 13°C
(56°F)		 16°C
(61°F)		 21°C
(70°F)		 28°C
(82°F)		 32°C
(89°F)		 33°C
(91°F)		 34°C
(93°F)		 33°C
(91°F)		 33°C
(91°F)		 30°C
(86°F)		 19°C
(67°F)		 17°C
(63°F)
Average high 1°C
(34°F)		 3°C
(38°F)		 10°C
(51°F)		 16°C
(61°F)		 23°C
(73°F)		 28°C
(83°F)		 29°C
(85°F)		 28°C
(83°F)		 26°C
(80°F)		 19°C
(66°F)		 9°C
(49°F)		 6°C
(43°F)
Daily mean -3°C
(27°F)		 -2°C
(29°F)		 5°C
(42°F)		 10°C
(51°F)		 18°C
(64°F)		 23°C
(74°F)		 25°C
(77°F)		 23°C
(74°F)		 21°C
(70°F)		 13°C
(56°F)		 5°C
(41°F)		 1°C
(35°F)
Average low -7°C
(20°F)		 -6°C
(21°F)		 0°C
(33°F)		 5°C
(42°F)		 13°C
(55°F)		 18°C
(65°F)		 20°C
(68°F)		 18°C
(65°F)		 15°C
(60°F)		 9°C
(48°F)		 0°C
(32°F)		 -3°C
(27°F)
Mean minimum -21°C
(-5°F)		 -21°C
(-5°F)		 -11°C
(13°F)		 -4°C
(25°F)		 4°C
(39°F)		 13°C
(55°F)		 15°C
(59°F)		 12°C
(55°F)		 8°C
(46°F)		 -1°C
(31°F)		 -9°C
(16°F)		 -13°C
(9°F)
Minimum -30°C
(-22°F)		 -30°C
(-22°F)		 -19°C
(-1°F)		 -8°C
(17°F)		 -0°C
(32°F)		 10°C
(50°F)		 13°C
(56°F)		 11°C
(52°F)		 5°C
(41°F)		 -5°C
(24°F)		 -14°C
(8°F)		 -21°C
(-6°F)

Compare climate in Forrest with other places

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

Monthly average precipitation in Forrest, Illinois, United States §

Forrest usually has the most precipitation in May, June and October, with an average of 13 rainy days and 133 mm (5.2 inches) of precipitation per month.The driest months in Forrest are January, November and December. On average, 60 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Forrest, 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) 64 (2.5) 70 (2.8) 105 (4.1) 116 (4.5) 158 (6.2) 116 (4.5) 93 (3.7) 97 (3.8) 70 (2.8) 127 (5.0) 60 (2.4) 55 (2.2)
Average precipitation days (≥ 1 mm) 8 10 13 11 16 12 12 11 8 12 9 7

Monthly sunshine hours in Forrest, Illinois, United States §

The sunniest months in Forrest are June, July and August, when the sun shines an average of 10 hours 57 minutes a day.Least sunny months in Forrest: January, February and December receive an average of 5 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Forrest, 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 117 170 218 239 279 330 347 330 288 220 192 187
Mean daily daylight hours 9h 37m 10h 39m 11h 58m 13h 19m 14h 28m 15h 2m 14h 43m 13h 42m 12h 24m 11h 3m 9h 53m 9h 17m

Solar UV radiation in Forrest, Illinois, United States §

Forrest 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 Low / 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 Forrest UV Index data.

Average daily maximum UV levels by month for Forrest, 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 6 9 10 11 10 9 8 6 4 2