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Monthly climate in Galena, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Galena features a humid continental climate (Dfb).Temperatures typically range between -6 °C (22 °F) and 24 °C (76 °F) through the year, but rarely can drop to -33 °C (-27 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1041 mm (41.0 inches) and receives 118 rainy days on the 1 mm (0.04 inches) threshold annually.Galena enjoys an average of 2961 hours of sunshine throughout the year, and daylight varies from 9 hours 5 minutes to 15 hours 14 minutes per day.

Monthly average temperatures in Galena, Illinois, United States §

The warmest months in Galena 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 -6 to -1 °C (22 - 30 °F) throughout the day. On average each year, Galena experiences 81 days above 25 °C (77.0 °F) and 122 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Galena, 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 10°C
(50°F)		 20°C
(69°F)		 23°C
(73°F)		 27°C
(80°F)		 34°C
(94°F)		 34°C
(93°F)		 35°C
(95°F)		 33°C
(91°F)		 33°C
(91°F)		 30°C
(86°F)		 22°C
(72°F)		 20°C
(68°F)
Mean maximum 7°C
(45°F)		 12°C
(53°F)		 18°C
(65°F)		 25°C
(78°F)		 31°C
(88°F)		 32°C
(90°F)		 33°C
(92°F)		 31°C
(89°F)		 31°C
(88°F)		 28°C
(83°F)		 17°C
(63°F)		 14°C
(57°F)
Average high -2°C
(28°F)		 -0°C
(32°F)		 8°C
(46°F)		 13°C
(56°F)		 21°C
(69°F)		 27°C
(81°F)		 29°C
(84°F)		 27°C
(81°F)		 24°C
(76°F)		 16°C
(60°F)		 7°C
(44°F)		 3°C
(37°F)
Daily mean -6°C
(22°F)		 -5°C
(24°F)		 3°C
(37°F)		 8°C
(47°F)		 16°C
(61°F)		 22°C
(72°F)		 24°C
(76°F)		 22°C
(72°F)		 19°C
(66°F)		 11°C
(52°F)		 3°C
(37°F)		 -1°C
(30°F)
Average low -10°C
(15°F)		 -10°C
(15°F)		 -1°C
(30°F)		 3°C
(38°F)		 11°C
(52°F)		 17°C
(63°F)		 19°C
(67°F)		 17°C
(63°F)		 14°C
(57°F)		 7°C
(44°F)		 -1°C
(30°F)		 -5°C
(24°F)
Mean minimum -24°C
(-11°F)		 -23°C
(-10°F)		 -14°C
(8°F)		 -4°C
(25°F)		 3°C
(37°F)		 12°C
(54°F)		 15°C
(59°F)		 12°C
(54°F)		 7°C
(44°F)		 -2°C
(29°F)		 -10°C
(15°F)		 -14°C
(6°F)
Minimum -32°C
(-26°F)		 -33°C
(-27°F)		 -24°C
(-11°F)		 -8°C
(18°F)		 -1°C
(30°F)		 10°C
(49°F)		 13°C
(56°F)		 12°C
(53°F)		 3°C
(38°F)		 -4°C
(24°F)		 -15°C
(5°F)		 -21°C
(-6°F)

Compare climate in Galena with other places

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

Monthly average precipitation in Galena, Illinois, United States §

Galena usually has the most precipitation in May, June and October, with an average of 12 rainy days and 132 mm (5.2 inches) of precipitation per month.The driest months in Galena are January, November and December. On average, 46 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Galena, 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) 50 (2.0) 60 (2.4) 65 (2.5) 88 (3.5) 146 (5.8) 134 (5.3) 88 (3.4) 95 (3.7) 112 (4.4) 115 (4.5) 45 (1.8) 43 (1.7)
Average precipitation days (≥ 1 mm) 8 8 10 11 15 11 12 10 9 11 7 6

Monthly sunshine hours in Galena, Illinois, United States §

The sunniest months in Galena are June, July and August, when the sun shines an average of 11 hours 6 minutes a day.Least sunny months in Galena: January, February and December receive an average of 5 hours 40 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Galena, 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 132 194 233 241 264 327 360 332 273 214 197 189
Mean daily daylight hours 9h 27m 10h 33m 11h 58m 13h 24m 14h 37m 15h 14m 14h 54m 13h 48m 12h 25m 10h 59m 9h 44m 9h 5m

Solar UV radiation in Galena, Illinois, United States §

Galena 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 Galena UV Index data.

Average daily maximum UV levels by month for Galena, 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