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Monthly climate in Stillman Valley, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Stillman Valley features a humid continental climate (Dfa).Temperatures typically range between -5 °C (23 °F) and 24 °C (76 °F) through the year, but rarely can drop to -33 °C (-26 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1071 mm (42.2 inches) and receives 118 rainy days on the 1 mm (0.04 inches) threshold annually.Stillman Valley enjoys an average of 2917 hours of sunshine throughout the year, and daylight varies from 9 hours 9 minutes to 15 hours 10 minutes per day.

Monthly average temperatures in Stillman Valley, Illinois, United States §

The warmest months in Stillman Valley are June, July and August, with daily mean temperatures ranging from 22 to 24 °C (72 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to 0 °C (23 - 32 °F) throughout the day. On average each year, Stillman Valley experiences 87 days above 25 °C (77.0 °F) and 116 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Stillman Valley, 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)		 21°C
(69°F)		 24°C
(76°F)		 28°C
(82°F)		 33°C
(92°F)		 35°C
(95°F)		 34°C
(93°F)		 34°C
(94°F)		 34°C
(93°F)		 31°C
(89°F)		 24°C
(75°F)		 20°C
(67°F)
Mean maximum 9°C
(49°F)		 13°C
(56°F)		 19°C
(67°F)		 26°C
(79°F)		 30°C
(87°F)		 32°C
(91°F)		 33°C
(91°F)		 32°C
(90°F)		 32°C
(89°F)		 29°C
(85°F)		 18°C
(64°F)		 15°C
(60°F)
Average high -1°C
(30°F)		 1°C
(34°F)		 9°C
(48°F)		 14°C
(57°F)		 21°C
(70°F)		 27°C
(81°F)		 29°C
(84°F)		 27°C
(82°F)		 25°C
(77°F)		 17°C
(62°F)		 7°C
(46°F)		 4°C
(39°F)
Daily mean -5°C
(23°F)		 -4°C
(26°F)		 4°C
(39°F)		 9°C
(48°F)		 16°C
(61°F)		 22°C
(72°F)		 24°C
(76°F)		 23°C
(73°F)		 20°C
(67°F)		 12°C
(54°F)		 3°C
(38°F)		 -0°C
(32°F)
Average low -9°C
(16°F)		 -8°C
(18°F)		 -1°C
(31°F)		 4°C
(39°F)		 11°C
(52°F)		 17°C
(63°F)		 19°C
(67°F)		 17°C
(63°F)		 14°C
(58°F)		 7°C
(46°F)		 -1°C
(31°F)		 -4°C
(25°F)
Mean minimum -24°C
(-11°F)		 -22°C
(-8°F)		 -12°C
(11°F)		 -5°C
(24°F)		 2°C
(36°F)		 12°C
(54°F)		 14°C
(58°F)		 12°C
(54°F)		 6°C
(43°F)		 -2°C
(29°F)		 -11°C
(13°F)		 -14°C
(7°F)
Minimum -31°C
(-24°F)		 -33°C
(-26°F)		 -21°C
(-6°F)		 -8°C
(17°F)		 -1°C
(30°F)		 9°C
(49°F)		 12°C
(55°F)		 11°C
(51°F)		 2°C
(37°F)		 -5°C
(23°F)		 -17°C
(2°F)		 -21°C
(-6°F)

Compare climate in Stillman Valley with other places

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

Monthly average precipitation in Stillman Valley, Illinois, United States §

Stillman Valley usually has the most precipitation in May, June and September, with an average of 12 rainy days and 133 mm (5.2 inches) of precipitation per month.The driest months in Stillman Valley are February, November and December. On average, 52 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Stillman Valley, 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) 60 (2.4) 56 (2.2) 79 (3.1) 109 (4.3) 156 (6.2) 121 (4.8) 78 (3.1) 77 (3.0) 120 (4.7) 116 (4.6) 49 (1.9) 51 (2.0)
Average precipitation days (≥ 1 mm) 7 9 10 11 15 12 10 9 10 12 7 6

Monthly sunshine hours in Stillman Valley, Illinois, United States §

The sunniest months in Stillman Valley are June, July and August, when the sun shines an average of 10 hours 57 minutes a day.Least sunny months in Stillman Valley: 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 Stillman Valley, 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 126 186 228 239 268 324 353 329 273 208 193 185
Mean daily daylight hours 9h 30m 10h 35m 11h 58m 13h 23m 14h 34m 15h 10m 14h 50m 13h 46m 12h 25m 11h 1m 9h 47m 9h 9m

Solar UV radiation in Stillman Valley, Illinois, United States §

Stillman Valley 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 Stillman Valley UV Index data.

Average daily maximum UV levels by month for Stillman Valley, 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