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Monthly climate in Forest Lake, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Forest Lake features a humid continental climate (Dfa).Temperatures typically range between -3 °C (26 °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 1105 mm (43.5 inches) and receives 130 rainy days on the 1 mm (0.04 inches) threshold annually.Forest Lake enjoys an average of 2981 hours of sunshine throughout the year, and daylight varies from 9 hours 7 minutes to 15 hours 12 minutes per day.

Monthly average temperatures in Forest Lake, Illinois, United States §

The warmest months in Forest Lake 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 (26 - 33 °F) throughout the day. On average each year, Forest Lake experiences 59 days above 25 °C (77.0 °F) and 97 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Forest Lake, 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
(55°F)		 18°C
(64°F)		 22°C
(72°F)		 25°C
(77°F)		 29°C
(85°F)		 31°C
(88°F)		 33°C
(92°F)		 32°C
(91°F)		 31°C
(88°F)		 29°C
(84°F)		 22°C
(71°F)		 18°C
(64°F)
Mean maximum 9°C
(48°F)		 12°C
(53°F)		 17°C
(63°F)		 23°C
(73°F)		 27°C
(81°F)		 29°C
(85°F)		 32°C
(89°F)		 31°C
(88°F)		 30°C
(86°F)		 27°C
(80°F)		 16°C
(62°F)		 14°C
(57°F)
Average high -1°C
(31°F)		 1°C
(34°F)		 7°C
(44°F)		 11°C
(53°F)		 17°C
(63°F)		 24°C
(75°F)		 27°C
(80°F)		 26°C
(79°F)		 23°C
(74°F)		 16°C
(61°F)		 7°C
(45°F)		 4°C
(39°F)
Daily mean -3°C
(26°F)		 -3°C
(28°F)		 3°C
(38°F)		 7°C
(46°F)		 14°C
(57°F)		 20°C
(68°F)		 23°C
(74°F)		 22°C
(73°F)		 19°C
(67°F)		 12°C
(54°F)		 4°C
(40°F)		 1°C
(33°F)
Average low -7°C
(20°F)		 -6°C
(21°F)		 -0°C
(32°F)		 4°C
(39°F)		 10°C
(50°F)		 16°C
(61°F)		 20°C
(68°F)		 19°C
(66°F)		 16°C
(60°F)		 9°C
(48°F)		 1°C
(34°F)		 -2°C
(28°F)
Mean minimum -20°C
(-4°F)		 -20°C
(-3°F)		 -11°C
(13°F)		 -3°C
(27°F)		 3°C
(38°F)		 12°C
(54°F)		 15°C
(60°F)		 14°C
(58°F)		 9°C
(49°F)		 1°C
(35°F)		 -8°C
(19°F)		 -12°C
(11°F)
Minimum -29°C
(-20°F)		 -30°C
(-21°F)		 -20°C
(-4°F)		 -7°C
(20°F)		 0°C
(33°F)		 9°C
(49°F)		 14°C
(57°F)		 12°C
(55°F)		 5°C
(42°F)		 -1°C
(31°F)		 -13°C
(9°F)		 -19°C
(-2°F)

Compare climate in Forest Lake with other places

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

Monthly average precipitation in Forest Lake, Illinois, United States §

Forest Lake usually has the most precipitation in April, May and October, with an average of 13 rainy days and 138 mm (5.5 inches) of precipitation per month.The driest months in Forest Lake are February, November and December. On average, 61 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Forest Lake, 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) 68 (2.7) 67 (2.6) 76 (3.0) 118 (4.6) 164 (6.5) 109 (4.3) 84 (3.3) 83 (3.3) 85 (3.3) 133 (5.2) 58 (2.3) 59 (2.3)
Average precipitation days (≥ 1 mm) 8 11 10 13 14 13 12 11 10 13 8 7

Monthly sunshine hours in Forest Lake, Illinois, United States §

The sunniest months in Forest Lake are June, July and August, when the sun shines an average of 11 hours 17 minutes a day.Least sunny months in Forest Lake: January, February and December receive an average of 5 hours 11 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Forest Lake, 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 119 181 240 252 288 331 365 341 282 215 189 171
Mean daily daylight hours 9h 28m 10h 34m 11h 58m 13h 24m 14h 36m 15h 12m 14h 53m 13h 48m 12h 25m 11h 0m 9h 45m 9h 7m

Solar UV radiation in Forest Lake, Illinois, United States §

Forest Lake 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 Forest Lake UV Index data.

Average daily maximum UV levels by month for Forest Lake, 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) 2 4 6 8 9 10 10 9 8 5 3 2