Jacksonville, Illinois Climate

United States

Pop. 19,103 Elev. 190 m / 623 ft TZ: America/Chicago (UTC-5) ·

Jacksonville sees warm summers peaking at 87°F (31°C) in July, and frigid winters that bottom out around 18°F (-8°C) in January. Humidity pushes the summer feels-like temperature to 103°F (39°C), while wind chill can drive winter lows to 11°F (-12°C). Precipitation occurs on roughly 52 days per year (35.9 in / 911 mm total), with snow on 4 days and 29 in (742 mm) of annual accumulation. The city averages 131 sunny days per year and around 37 thunderstorm days. Nearby lake water reaches 82°F (28°C) in summer.

Temperature 87°F (31°C) high 18°F (-8°C) low
Feels like 103°F (39°C) high 11°F (-12°C) low
Rain 52 days 35.9 in (911 mm) /yr
Snow 4 days 29.2 in (742 mm) /yr
Sky 131 sunny 37 stormy
Wind 2.5 mph (1.1 m/s) avg

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Monthly Climate Chart

↓ Monthly data table
Best months to visit: Mar, May, Aug, Sep, Oct

Sky & Air by Month

Cloud cover (%)
49
Jan
58
Feb
49
Mar
67
Apr
58
May
54
Jun
64
Jul
47
Aug
39
Sep
44
Oct
50
Nov
66
Dec
Humidity (%)
67
Jan
64
Feb
55
Mar
61
Apr
62
May
73
Jun
78
Jul
74
Aug
64
Sep
65
Oct
68
Nov
76
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

Cities with Similar Climate

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Nearby Cities

Nearby

Commercial airport 30 mi Abraham Lincoln Capital Airport (SPI)
Ski resort 86 mi Hidden Valley
National park 148 mi Emmett Till and Mamie Till-Mobley National Monument
Hospital 1 mi Mental Health and Development Center
Hiking trail 73 mi ADT - Missouri - L - Seg 1

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 33°F 1°C 18°F -8°C 0.4 in 11 mm 8.9 in227 mm 13
February 40°F 5°C 24°F -4°C 0.3 in 8 mm 4.2 in107 mm 9
March 63°F 17°C 40°F 4°C 3.2 in 81 mm 1.2 in31 mm 14
April 68°F 20°C 47°F 9°C 4.8 in 122 mm 0.1 in1 mm 5
May 74°F 23°C 55°F 13°C 3.6 in 90 mm 11
June 84°F 29°C 67°F 20°C 6.3 in 161 mm 9
July 87°F 31°C 72°F 22°C 8.7 in 220 mm 6
August 83°F 28°C 65°F 18°C 1.4 in 35 mm 14
September 82°F 28°C 57°F 14°C 1.7 in 44 mm 15
October 71°F 22°C 51°F 11°C 3.0 in 77 mm 16
November 55°F 13°C 38°F 3°C 1.6 in 39 mm 8.4 in213 mm 12
December 41°F 5°C 24°F -4°C 0.8 in 21 mm 6.4 in162 mm 7

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 13 0
February 9 0
March 14 3
April 5 7
May 11 3
June 9 7
July 6 10
August 14 2
September 15 3
October 16 1
November 12 1
December 7 0

Water Temperatures Data

↑ See chart
Month Lake Avg High
January 33°F 0°C
February 32°F 0°C
March 47°F 9°C
April 57°F 14°C
May 64°F 18°C
June 76°F 24°C
July 82°F 28°C
August 77°F 25°C
September 71°F 22°C
October 62°F 17°C
November 46°F 8°C
December 34°F 1°C