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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Explore on the MapMonthly Climate Chart
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
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →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
↑ See chart| 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 |