Hillsboro, Illinois Climate

United States

Pop. 5,726 Elev. 190 m / 623 ft TZ: America/Chicago (UTC-5) ·

Hillsboro has warm summers with average highs of 87°F (31°C) in July, and frigid winters averaging 18°F (-8°C) in January. Humidity pushes the summer feels-like temperature to around 103°F (39°C). Rain falls on about 55 days per year (38.9 in / 988 mm total), with snow on 5 days and 30 in (752 mm) of annual accumulation. The city averages 132 sunny days per year and around 42 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 12°F (-11°C) low
Rain 55 days 38.9 in (988 mm) /yr
Snow 5 days 29.6 in (752 mm) /yr
Sky 132 sunny 42 stormy
Wind 2.3 mph (1.0 m/s) avg

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Monthly Climate Chart

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

Sky & Air by Month

Cloud cover (%)
49
Jan
59
Feb
51
Mar
66
Apr
61
May
57
Jun
61
Jul
47
Aug
37
Sep
44
Oct
51
Nov
65
Dec
Humidity (%)
68
Jan
65
Feb
54
Mar
62
Apr
65
May
72
Jun
79
Jul
73
Aug
65
Sep
67
Oct
69
Nov
75
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

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Nearby Cities

Nearby

Commercial airport 46 mi Scott AFB/Midamerica Airport (BLV)
Ski resort 76 mi Hidden Valley
National park 96 mi Emmett Till and Mamie Till-Mobley National Monument
Hospital 1 mi Hillsboro Area Hospital
Hiking trail 52 mi Big Oak Loop

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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 0.5 in 12 mm 11.3 in286 mm 13
February 42°F 5°C 26°F -4°C 0.7 in 17 mm 6.0 in154 mm 9
March 63°F 17°C 41°F 5°C 2.6 in 67 mm 0.6 in16 mm 15
April 68°F 20°C 48°F 9°C 6.8 in 172 mm 0.0 in0 mm 6
May 74°F 23°C 55°F 13°C 5.3 in 133 mm 8
June 84°F 29°C 68°F 20°C 5.9 in 151 mm 7
July 87°F 31°C 72°F 22°C 7.7 in 195 mm 6
August 83°F 28°C 65°F 18°C 1.1 in 28 mm 16
September 82°F 28°C 57°F 14°C 2.2 in 55 mm 18
October 71°F 21°C 51°F 10°C 2.3 in 57 mm 16
November 55°F 13°C 38°F 3°C 3.2 in 81 mm 6.2 in158 mm 11
December 42°F 5°C 26°F -3°C 0.7 in 19 mm 5.4 in138 mm 7

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 13 0
February 9 0
March 15 2
April 6 8
May 8 6
June 7 7
July 6 11
August 16 1
September 18 2
October 16 2
November 11 3
December 7 0

Water Temperatures Data

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Month Lake Avg High
January 33°F 1°C
February 33°F 0°C
March 48°F 9°C
April 58°F 14°C
May 65°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