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Monthly climate in Palmyra, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Palmyra features a humid continental climate (Dfa).Temperatures typically range between -5 °C (24 °F) and 24 °C (76 °F) through the year, but rarely can drop to -34 °C (-29 °F) or can rise to as high as 34 °C (94 °F).The average annual precipitation amounts to about 1125 mm (44.3 inches) and receives 120 rainy days on the 1 mm (0.04 inches) threshold annually.Palmyra enjoys an average of 2977 hours of sunshine throughout the year, and daylight varies from 9 hours 10 minutes to 15 hours 9 minutes per day.

Monthly average temperatures in Palmyra, Illinois, United States §

The warmest months in Palmyra are June, July and August, with daily mean temperatures ranging from 23 to 24 °C (73 - 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 (24 - 32 °F) throughout the day. On average each year, Palmyra experiences 91 days above 25 °C (77.0 °F) and 114 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Palmyra, 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
(55°F)		 21°C
(71°F)		 25°C
(77°F)		 28°C
(83°F)		 34°C
(93°F)		 34°C
(94°F)		 34°C
(93°F)		 34°C
(94°F)		 34°C
(94°F)		 31°C
(88°F)		 24°C
(76°F)		 20°C
(68°F)
Mean maximum 9°C
(49°F)		 14°C
(58°F)		 20°C
(68°F)		 26°C
(80°F)		 31°C
(88°F)		 33°C
(91°F)		 33°C
(92°F)		 32°C
(90°F)		 32°C
(90°F)		 30°C
(86°F)		 18°C
(64°F)		 16°C
(61°F)
Average high -1°C
(30°F)		 1°C
(34°F)		 9°C
(49°F)		 14°C
(58°F)		 22°C
(71°F)		 27°C
(82°F)		 29°C
(84°F)		 28°C
(82°F)		 25°C
(78°F)		 17°C
(63°F)		 8°C
(46°F)		 4°C
(40°F)
Daily mean -5°C
(24°F)		 -3°C
(26°F)		 4°C
(40°F)		 9°C
(49°F)		 17°C
(62°F)		 23°C
(73°F)		 24°C
(76°F)		 23°C
(73°F)		 20°C
(68°F)		 12°C
(54°F)		 3°C
(39°F)		 -0°C
(32°F)
Average low -9°C
(16°F)		 -8°C
(18°F)		 -0°C
(31°F)		 4°C
(40°F)		 12°C
(53°F)		 17°C
(64°F)		 19°C
(67°F)		 17°C
(64°F)		 14°C
(58°F)		 8°C
(46°F)		 -1°C
(31°F)		 -4°C
(25°F)
Mean minimum -23°C
(-10°F)		 -22°C
(-7°F)		 -11°C
(12°F)		 -5°C
(24°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)		 -11°C
(13°F)		 -14°C
(7°F)
Minimum -32°C
(-25°F)		 -34°C
(-29°F)		 -21°C
(-5°F)		 -8°C
(17°F)		 -1°C
(30°F)		 9°C
(49°F)		 13°C
(56°F)		 11°C
(52°F)		 3°C
(38°F)		 -5°C
(24°F)		 -17°C
(2°F)		 -21°C
(-6°F)

Compare climate in Palmyra with other places

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

Monthly average precipitation in Palmyra, Illinois, United States §

Palmyra usually has the most precipitation in May, June and October, with an average of 13 rainy days and 139 mm (5.5 inches) of precipitation per month.The driest months in Palmyra are February, November and December. On average, 54 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Palmyra, 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) 61 (2.4) 60 (2.3) 85 (3.3) 113 (4.5) 164 (6.5) 135 (5.3) 100 (3.9) 71 (2.8) 116 (4.6) 117 (4.6) 53 (2.1) 50 (2.0)
Average precipitation days (≥ 1 mm) 7 9 10 11 16 11 11 9 10 13 7 6

Monthly sunshine hours in Palmyra, Illinois, United States §

The sunniest months in Palmyra are June, July and August, when the sun shines an average of 11 hours 10 minutes a day.Least sunny months in Palmyra: January, February and December receive an average of 5 hours 34 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Palmyra, 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 128 185 227 241 276 334 357 335 279 218 197 194
Mean daily daylight hours 9h 31m 10h 35m 11h 58m 13h 22m 14h 33m 15h 9m 14h 49m 13h 46m 12h 25m 11h 1m 9h 47m 9h 10m

Solar UV radiation in Palmyra, Illinois, United States §

Palmyra 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 4. For more detailed information, check out our hourly Palmyra UV Index data.

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