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Monthly climate in Rockford, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Rockford 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 (-28 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1030 mm (40.5 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually.Rockford enjoys an average of 2939 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 Rockford, Illinois, United States §

The warmest months in Rockford 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 - 31 °F) throughout the day. On average each year, Rockford experiences 86 days above 25 °C (77.0 °F) and 118 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Rockford, 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)		 20°C
(69°F)		 24°C
(76°F)		 28°C
(82°F)		 34°C
(93°F)		 35°C
(94°F)		 35°C
(95°F)		 35°C
(95°F)		 34°C
(93°F)		 31°C
(89°F)		 24°C
(76°F)		 19°C
(67°F)
Mean maximum 9°C
(49°F)		 13°C
(55°F)		 19°C
(67°F)		 26°C
(79°F)		 31°C
(87°F)		 32°C
(91°F)		 33°C
(92°F)		 32°C
(90°F)		 32°C
(89°F)		 29°C
(85°F)		 18°C
(64°F)		 15°C
(59°F)
Average high -1°C
(30°F)		 0°C
(33°F)		 8°C
(47°F)		 14°C
(57°F)		 21°C
(70°F)		 27°C
(81°F)		 29°C
(84°F)		 28°C
(82°F)		 25°C
(77°F)		 16°C
(62°F)		 7°C
(45°F)		 4°C
(39°F)
Daily mean -5°C
(23°F)		 -4°C
(25°F)		 3°C
(38°F)		 9°C
(48°F)		 16°C
(61°F)		 22°C
(72°F)		 24°C
(76°F)		 22°C
(73°F)		 19°C
(67°F)		 12°C
(53°F)		 3°C
(38°F)		 -0°C
(31°F)
Average low -9°C
(16°F)		 -9°C
(17°F)		 -1°C
(30°F)		 4°C
(39°F)		 11°C
(52°F)		 17°C
(63°F)		 19°C
(67°F)		 17°C
(63°F)		 14°C
(57°F)		 7°C
(45°F)		 -1°C
(30°F)		 -4°C
(25°F)
Mean minimum -24°C
(-11°F)		 -24°C
(-10°F)		 -12°C
(10°F)		 -5°C
(24°F)		 2°C
(36°F)		 12°C
(54°F)		 14°C
(57°F)		 11°C
(53°F)		 6°C
(43°F)		 -2°C
(29°F)		 -11°C
(12°F)		 -14°C
(7°F)
Minimum -31°C
(-24°F)		 -33°C
(-28°F)		 -21°C
(-6°F)		 -8°C
(18°F)		 -1°C
(30°F)		 9°C
(48°F)		 12°C
(54°F)		 9°C
(49°F)		 2°C
(36°F)		 -5°C
(23°F)		 -17°C
(2°F)		 -21°C
(-6°F)

Compare climate in Rockford with other places

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

Monthly average precipitation in Rockford, Illinois, United States §

Rockford usually has the most precipitation in May, June and October, with an average of 12 rainy days and 126 mm (5.0 inches) of precipitation per month.The driest months in Rockford are February, November and December. On average, 51 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rockford, 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) 55 (2.2) 70 (2.8) 102 (4.0) 156 (6.1) 111 (4.4) 74 (2.9) 81 (3.2) 110 (4.3) 112 (4.4) 48 (1.9) 50 (2.0)
Average precipitation days (≥ 1 mm) 7 10 10 12 15 11 11 10 10 12 7 6

Monthly sunshine hours in Rockford, Illinois, United States §

The sunniest months in Rockford are June, July and August, when the sun shines an average of 11 hours 4 minutes a day.Least sunny months in Rockford: January, November and December receive an average of 5 hours 29 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rockford, 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 128 192 234 239 270 326 358 333 273 205 192 183
Mean daily daylight hours 9h 28m 10h 34m 11h 58m 13h 23m 14h 36m 15h 12m 14h 52m 13h 47m 12h 25m 11h 0m 9h 46m 9h 7m

Solar UV radiation in Rockford, Illinois, United States §

Rockford 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 Rockford UV Index data.

Average daily maximum UV levels by month for Rockford, 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 5 3 2