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Monthly climate in Monmouth, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Monmouth features a humid continental climate (Dfa).Temperatures typically range between -4 °C (26 °F) and 25 °C (78 °F) through the year, but rarely can drop to -32 °C (-26 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1105 mm (43.5 inches) and receives 114 rainy days on the 1 mm (0.04 inches) threshold annually.Monmouth enjoys an average of 2984 hours of sunshine throughout the year, and daylight varies from 9 hours 16 minutes to 15 hours 3 minutes per day.

Monthly average temperatures in Monmouth, Illinois, United States §

The warmest months in Monmouth are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (75 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to 1 °C (26 - 33 °F) throughout the day. On average each year, Monmouth experiences 103 days above 25 °C (77.0 °F) and 106 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Monmouth, 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
(57°F)		 22°C
(72°F)		 23°C
(74°F)		 29°C
(85°F)		 35°C
(96°F)		 35°C
(95°F)		 36°C
(97°F)		 35°C
(96°F)		 35°C
(94°F)		 32°C
(90°F)		 24°C
(76°F)		 22°C
(72°F)
Mean maximum 11°C
(52°F)		 15°C
(60°F)		 20°C
(69°F)		 27°C
(81°F)		 32°C
(89°F)		 33°C
(92°F)		 34°C
(94°F)		 34°C
(93°F)		 33°C
(91°F)		 30°C
(87°F)		 18°C
(65°F)		 17°C
(63°F)
Average high 0°C
(33°F)		 2°C
(36°F)		 10°C
(50°F)		 15°C
(60°F)		 22°C
(73°F)		 28°C
(84°F)		 30°C
(86°F)		 29°C
(84°F)		 26°C
(80°F)		 18°C
(64°F)		 9°C
(48°F)		 5°C
(42°F)
Daily mean -4°C
(26°F)		 -2°C
(28°F)		 5°C
(41°F)		 10°C
(51°F)		 17°C
(64°F)		 23°C
(75°F)		 25°C
(78°F)		 23°C
(75°F)		 21°C
(69°F)		 13°C
(55°F)		 4°C
(40°F)		 1°C
(33°F)
Average low -8°C
(19°F)		 -7°C
(19°F)		 1°C
(33°F)		 5°C
(41°F)		 13°C
(55°F)		 18°C
(65°F)		 20°C
(69°F)		 18°C
(65°F)		 15°C
(60°F)		 8°C
(47°F)		 -0°C
(32°F)		 -4°C
(26°F)
Mean minimum -21°C
(-6°F)		 -21°C
(-6°F)		 -11°C
(13°F)		 -4°C
(25°F)		 4°C
(40°F)		 13°C
(56°F)		 16°C
(60°F)		 13°C
(55°F)		 8°C
(46°F)		 -2°C
(29°F)		 -10°C
(14°F)		 -14°C
(8°F)
Minimum -30°C
(-23°F)		 -32°C
(-26°F)		 -19°C
(-2°F)		 -9°C
(16°F)		 0°C
(32°F)		 10°C
(50°F)		 14°C
(58°F)		 12°C
(53°F)		 6°C
(43°F)		 -5°C
(24°F)		 -16°C
(4°F)		 -21°C
(-6°F)

Compare climate in Monmouth with other places

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

Monthly average precipitation in Monmouth, Illinois, United States §

Monmouth usually has the most precipitation in May, June and October, with an average of 12 rainy days and 143 mm (5.6 inches) of precipitation per month.The driest months in Monmouth are January, November and December. On average, 52 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Monmouth, 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) 56 (2.2) 63 (2.5) 102 (4.0) 99 (3.9) 166 (6.6) 138 (5.4) 93 (3.7) 64 (2.5) 99 (3.9) 126 (5.0) 51 (2.0) 49 (1.9)
Average precipitation days (≥ 1 mm) 7 10 11 11 15 11 9 8 8 12 7 5

Monthly sunshine hours in Monmouth, Illinois, United States §

The sunniest months in Monmouth are June, July and August, when the sun shines an average of 11 hours 9 minutes a day.Least sunny months in Monmouth: 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 Monmouth, 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 128 186 224 240 271 334 356 335 280 222 202 200
Mean daily daylight hours 9h 36m 10h 38m 11h 58m 13h 19m 14h 28m 15h 3m 14h 44m 13h 42m 12h 24m 11h 3m 9h 52m 9h 16m

Solar UV radiation in Monmouth, Illinois, United States §

Monmouth experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 11, which corresponds to the Very High / Extreme 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 4. For more detailed information, check out our hourly Monmouth UV Index data.

Average daily maximum UV levels by month for Monmouth, 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 6 8 9 11 10 9 8 6 4 2