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Monthly climate in Big Rock, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Big Rock features a humid continental climate (Dfa).Temperatures typically range between -4 °C (25 °F) and 24 °C (75 °F) through the year, but rarely can drop to -34 °C (-29 °F) or can rise to as high as 34 °C (94 °F).The average annual precipitation amounts to about 1155 mm (45.5 inches) and receives 127 rainy days on the 1 mm (0.04 inches) threshold annually.Big Rock enjoys an average of 2961 hours of sunshine throughout the year, and daylight varies from 9 hours 11 minutes to 15 hours 8 minutes per day.

Monthly average temperatures in Big Rock, Illinois, United States §

The warmest months in Big Rock are June, July and August, with daily mean temperatures ranging from 22 to 24 °C (72 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to 0 °C (25 - 33 °F) throughout the day. On average each year, Big Rock experiences 87 days above 25 °C (77.0 °F) and 113 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Big Rock, 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 14°C
(58°F)		 21°C
(70°F)		 26°C
(79°F)		 29°C
(85°F)		 33°C
(92°F)		 34°C
(94°F)		 34°C
(93°F)		 34°C
(94°F)		 34°C
(93°F)		 31°C
(88°F)		 24°C
(76°F)		 19°C
(67°F)
Mean maximum 10°C
(51°F)		 14°C
(58°F)		 20°C
(69°F)		 27°C
(80°F)		 31°C
(87°F)		 33°C
(91°F)		 33°C
(91°F)		 32°C
(91°F)		 32°C
(90°F)		 29°C
(85°F)		 18°C
(64°F)		 16°C
(60°F)
Average high -1°C
(31°F)		 1°C
(35°F)		 9°C
(49°F)		 14°C
(58°F)		 21°C
(70°F)		 27°C
(81°F)		 28°C
(83°F)		 27°C
(82°F)		 25°C
(77°F)		 17°C
(63°F)		 8°C
(46°F)		 4°C
(40°F)
Daily mean -4°C
(25°F)		 -3°C
(27°F)		 4°C
(40°F)		 9°C
(49°F)		 16°C
(61°F)		 22°C
(72°F)		 24°C
(75°F)		 22°C
(73°F)		 20°C
(68°F)		 12°C
(54°F)		 4°C
(39°F)		 0°C
(33°F)
Average low -8°C
(18°F)		 -7°C
(19°F)		 -1°C
(31°F)		 4°C
(39°F)		 11°C
(52°F)		 17°C
(63°F)		 19°C
(67°F)		 18°C
(64°F)		 14°C
(58°F)		 8°C
(46°F)		 -1°C
(31°F)		 -4°C
(26°F)
Mean minimum -23°C
(-9°F)		 -22°C
(-8°F)		 -11°C
(12°F)		 -4°C
(24°F)		 3°C
(37°F)		 12°C
(54°F)		 14°C
(58°F)		 12°C
(53°F)		 7°C
(44°F)		 -1°C
(30°F)		 -11°C
(13°F)		 -14°C
(8°F)
Minimum -31°C
(-24°F)		 -34°C
(-29°F)		 -20°C
(-4°F)		 -8°C
(17°F)		 -1°C
(30°F)		 10°C
(50°F)		 13°C
(55°F)		 10°C
(50°F)		 3°C
(37°F)		 -5°C
(23°F)		 -16°C
(3°F)		 -21°C
(-6°F)

Compare climate in Big Rock with other places

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

Monthly average precipitation in Big Rock, Illinois, United States §

Big Rock usually has the most precipitation in May, June and October, with an average of 13 rainy days and 141 mm (5.6 inches) of precipitation per month.The driest months in Big Rock are February, November and December. On average, 56 mm (2.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Big Rock, 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) 63 (2.5) 61 (2.4) 86 (3.4) 117 (4.6) 157 (6.2) 139 (5.5) 112 (4.4) 81 (3.2) 102 (4.0) 128 (5.1) 56 (2.2) 52 (2.0)
Average precipitation days (≥ 1 mm) 8 10 10 12 16 13 11 11 9 12 8 7

Monthly sunshine hours in Big Rock, Illinois, United States §

The sunniest months in Big Rock are June, July and August, when the sun shines an average of 11 hours 7 minutes a day.Least sunny months in Big Rock: January, February and December receive an average of 5 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Big Rock, 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 119 180 229 242 283 330 357 334 282 220 194 186
Mean daily daylight hours 9h 31m 10h 36m 11h 58m 13h 22m 14h 33m 15h 8m 14h 49m 13h 46m 12h 25m 11h 1m 9h 48m 9h 11m

Solar UV radiation in Big Rock, Illinois, United States §

Big Rock 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, February 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 Big Rock UV Index data.

Average daily maximum UV levels by month for Big Rock, 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 4 2