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Monthly climate in Saint Elmo, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Saint Elmo features a humid subtropical climate (Cfa).Temperatures typically range between 0 °C (32 °F) and 26 °C (79 °F) through the year, but rarely can drop to -22 °C (-7 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 1236 mm (48.7 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually.Saint Elmo enjoys an average of 2976 hours of sunshine throughout the year, and daylight varies from 9 hours 27 minutes to 14 hours 50 minutes per day.

Monthly average temperatures in Saint Elmo, Illinois, United States §

The warmest months in Saint Elmo 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 0 to 3 °C (32 - 38 °F) throughout the day. On average each year, Saint Elmo experiences 118 days above 25 °C (77.0 °F) and 80 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Saint Elmo, 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 20°C
(67°F)		 23°C
(74°F)		 24°C
(76°F)		 29°C
(85°F)		 34°C
(94°F)		 36°C
(97°F)		 37°C
(99°F)		 34°C
(94°F)		 34°C
(93°F)		 34°C
(93°F)		 25°C
(78°F)		 20°C
(67°F)
Mean maximum 16°C
(61°F)		 19°C
(66°F)		 22°C
(73°F)		 28°C
(83°F)		 32°C
(90°F)		 34°C
(94°F)		 35°C
(95°F)		 33°C
(92°F)		 33°C
(91°F)		 31°C
(88°F)		 22°C
(71°F)		 18°C
(65°F)
Average high 4°C
(39°F)		 6°C
(44°F)		 13°C
(55°F)		 18°C
(65°F)		 24°C
(76°F)		 30°C
(86°F)		 31°C
(88°F)		 29°C
(85°F)		 28°C
(82°F)		 20°C
(69°F)		 11°C
(52°F)		 8°C
(47°F)
Daily mean -0°C
(32°F)		 2°C
(35°F)		 8°C
(46°F)		 13°C
(55°F)		 20°C
(67°F)		 25°C
(77°F)		 26°C
(79°F)		 24°C
(76°F)		 22°C
(72°F)		 15°C
(59°F)		 6°C
(43°F)		 3°C
(38°F)
Average low -4°C
(25°F)		 -3°C
(27°F)		 3°C
(38°F)		 7°C
(45°F)		 15°C
(59°F)		 20°C
(68°F)		 21°C
(71°F)		 19°C
(67°F)		 17°C
(62°F)		 10°C
(50°F)		 1°C
(35°F)		 -1°C
(31°F)
Mean minimum -16°C
(3°F)		 -16°C
(3°F)		 -8°C
(17°F)		 -1°C
(30°F)		 5°C
(42°F)		 15°C
(59°F)		 16°C
(61°F)		 13°C
(56°F)		 8°C
(48°F)		 -0°C
(32°F)		 -7°C
(19°F)		 -12°C
(11°F)
Minimum -22°C
(-7°F)		 -20°C
(-3°F)		 -17°C
(2°F)		 -4°C
(25°F)		 3°C
(37°F)		 11°C
(52°F)		 14°C
(58°F)		 12°C
(54°F)		 7°C
(44°F)		 -4°C
(25°F)		 -13°C
(9°F)		 -19°C
(-3°F)

Compare climate in Saint Elmo with other places

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

Monthly average precipitation in Saint Elmo, Illinois, United States §

Saint Elmo usually has the most precipitation in March, April and May, with an average of 12 rainy days and 138 mm (5.4 inches) of precipitation per month.The driest months in Saint Elmo are January, September and December. On average, 74 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saint Elmo, 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) 82 (3.2) 86 (3.4) 134 (5.3) 126 (5.0) 153 (6.0) 107 (4.2) 99 (3.9) 105 (4.2) 65 (2.6) 116 (4.5) 88 (3.5) 75 (2.9)
Average precipitation days (≥ 1 mm) 9 10 12 11 14 10 11 10 6 11 9 8

Monthly sunshine hours in Saint Elmo, Illinois, United States §

The sunniest months in Saint Elmo are June, July and August, when the sun shines an average of 11 hours 4 minutes a day.Least sunny months in Saint Elmo: January, February and December receive an average of 5 hours 14 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Saint Elmo, 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 119 168 210 246 284 337 353 327 294 238 205 189
Mean daily daylight hours 9h 46m 10h 44m 11h 58m 13h 15m 14h 19m 14h 50m 14h 33m 13h 36m 12h 23m 11h 7m 10h 1m 9h 27m

Solar UV radiation in Saint Elmo, Illinois, United States §

Saint Elmo experiences the highest level of ultraviolet (UV) radiation in May, June and July, 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 Saint Elmo UV Index data.

Average daily maximum UV levels by month for Saint Elmo, 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 11 11 10 9 8 6 4 3