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Monthly climate in Quincy, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Quincy features a humid continental climate (Dfa).Temperatures typically range between -2 °C (29 °F) and 26 °C (79 °F) through the year, but rarely can drop to -27 °C (-17 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1072 mm (42.2 inches) and receives 111 rainy days on the 1 mm (0.04 inches) threshold annually.Quincy enjoys an average of 2985 hours of sunshine throughout the year, and daylight varies from 9 hours 21 minutes to 14 hours 57 minutes per day.

Monthly average temperatures in Quincy, Illinois, United States §

The warmest months in Quincy are June, July and August, with daily mean temperatures ranging from 24 to 26 °C (76 - 79 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 2 °C (29 - 36 °F) throughout the day. On average each year, Quincy experiences 112 days above 25 °C (77.0 °F) and 91 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Quincy, 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 16°C
(62°F)		 24°C
(76°F)		 25°C
(77°F)		 29°C
(85°F)		 35°C
(95°F)		 36°C
(97°F)		 36°C
(97°F)		 36°C
(96°F)		 35°C
(95°F)		 33°C
(91°F)		 24°C
(76°F)		 23°C
(73°F)
Mean maximum 14°C
(57°F)		 18°C
(64°F)		 22°C
(71°F)		 28°C
(84°F)		 33°C
(91°F)		 34°C
(93°F)		 35°C
(96°F)		 34°C
(93°F)		 33°C
(92°F)		 31°C
(88°F)		 20°C
(68°F)		 19°C
(66°F)
Average high 2°C
(36°F)		 5°C
(40°F)		 12°C
(53°F)		 17°C
(63°F)		 24°C
(75°F)		 29°C
(85°F)		 31°C
(88°F)		 29°C
(85°F)		 27°C
(81°F)		 19°C
(66°F)		 10°C
(51°F)		 7°C
(45°F)
Daily mean -2°C
(29°F)		 -1°C
(31°F)		 7°C
(44°F)		 11°C
(53°F)		 19°C
(66°F)		 24°C
(76°F)		 26°C
(79°F)		 24°C
(76°F)		 21°C
(71°F)		 14°C
(57°F)		 6°C
(42°F)		 2°C
(36°F)
Average low -6°C
(21°F)		 -5°C
(23°F)		 2°C
(36°F)		 6°C
(43°F)		 14°C
(57°F)		 19°C
(67°F)		 21°C
(70°F)		 19°C
(66°F)		 16°C
(61°F)		 9°C
(48°F)		 1°C
(34°F)		 -2°C
(28°F)
Mean minimum -20°C
(-3°F)		 -19°C
(-2°F)		 -9°C
(15°F)		 -3°C
(28°F)		 6°C
(42°F)		 14°C
(58°F)		 16°C
(62°F)		 13°C
(57°F)		 8°C
(47°F)		 -1°C
(30°F)		 -9°C
(17°F)		 -12°C
(11°F)
Minimum -27°C
(-16°F)		 -27°C
(-17°F)		 -17°C
(2°F)		 -8°C
(19°F)		 3°C
(38°F)		 11°C
(52°F)		 15°C
(59°F)		 12°C
(55°F)		 5°C
(42°F)		 -5°C
(24°F)		 -14°C
(6°F)		 -20°C
(-3°F)

Compare climate in Quincy with other places

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

Monthly average precipitation in Quincy, Illinois, United States §

Quincy usually has the most precipitation in March, May and June, with an average of 11 rainy days and 129 mm (5.1 inches) of precipitation per month.The driest months in Quincy 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 Quincy, 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) 59 (2.3) 113 (4.4) 102 (4.0) 168 (6.6) 108 (4.2) 86 (3.4) 90 (3.6) 84 (3.3) 106 (4.2) 53 (2.1) 42 (1.7)
Average precipitation days (≥ 1 mm) 7 9 11 10 15 9 9 9 7 11 8 6

Monthly sunshine hours in Quincy, Illinois, United States §

The sunniest months in Quincy are June, July and August, when the sun shines an average of 11 hours 5 minutes a day.Least sunny months in Quincy: January, February and December receive an average of 5 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Quincy, 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 124 181 211 245 276 332 354 333 282 228 207 206
Mean daily daylight hours 9h 40m 10h 41m 11h 58m 13h 17m 14h 24m 14h 57m 14h 39m 13h 39m 12h 23m 11h 5m 9h 56m 9h 21m

Solar UV radiation in Quincy, Illinois, United States §

Quincy experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the 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 Quincy UV Index data.

Average daily maximum UV levels by month for Quincy, 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 5 7 9 10 11 10 10 8 6 4 3