Gillespie, Illinois Climate
United States
Pop. 3,176 Elev. 201 m / 659 ft
TZ: America/Chicago (UTC-5) ·
Gillespie 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 around 103°F (39°C). Precipitation occurs on roughly 54 days per year (38.9 in / 988 mm total), with snow on 5 days and 29 in (745 mm) of annual accumulation. The city averages 127 sunny days per year and around 42 thunderstorm days. Nearby lake water reaches 83°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 | 54 days | 38.9 in (988 mm) /yr |
| Snow | 5 days | 29.3 in (745 mm) /yr |
| Sky | 127 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 (%)
50
Jan 59
Feb 51
Mar 66
Apr 61
May 56
Jun 61
Jul 47
Aug 38
Sep 45
Oct 50
Nov 64
Dec Humidity (%)
68
Jan 66
Feb 54
Mar 62
Apr 65
May 73
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 40 mi Scott AFB/Midamerica Airport (BLV)
Ski resort 61 mi Hidden Valley
National park 100 mi Emmett Till and Mamie Till-Mobley National Monument
Hospital 8 mi Community Hospital of Staunton
Hiking trail 42 mi
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 34°F 1°C | 18°F -8°C | 0.4 in 11 mm | 11.4 in289 mm | 13 |
| February | 41°F 5°C | 26°F -4°C | 0.6 in 16 mm | 6.0 in153 mm | 9 |
| March | 63°F 17°C | 41°F 5°C | 2.7 in 68 mm | 0.7 in18 mm | 14 |
| April | 68°F 20°C | 48°F 9°C | 6.7 in 171 mm | 0.0 in1 mm | 5 |
| May | 74°F 23°C | 55°F 13°C | 5.3 in 134 mm | — | 8 |
| June | 84°F 29°C | 68°F 20°C | 5.7 in 144 mm | — | 9 |
| July | 87°F 31°C | 73°F 23°C | 7.6 in 193 mm | — | 5 |
| August | 83°F 28°C | 65°F 18°C | 1.1 in 29 mm | — | 15 |
| September | 82°F 28°C | 57°F 14°C | 2.3 in 58 mm | — | 15 |
| October | 71°F 21°C | 51°F 11°C | 2.6 in 66 mm | — | 16 |
| November | 55°F 13°C | 38°F 3°C | 3.2 in 82 mm | 6.3 in159 mm | 11 |
| December | 42°F 6°C | 26°F -3°C | 0.7 in 18 mm | 4.9 in125 mm | 7 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 13 | 0 |
| February | 9 | 0 |
| March | 14 | 3 |
| April | 5 | 8 |
| May | 8 | 6 |
| June | 9 | 7 |
| July | 5 | 10 |
| August | 15 | 1 |
| September | 15 | 3 |
| October | 16 | 2 |
| November | 11 | 2 |
| December | 7 | 0 |
Water Temperatures Data
↑ See chart| Month | Lake Avg High |
|---|---|
| January | 33°F 0°C |
| February | 32°F 0°C |
| March | 49°F 9°C |
| April | 58°F 15°C |
| May | 65°F 18°C |
| June | 77°F 25°C |
| July | 83°F 28°C |
| August | 77°F 25°C |
| September | 72°F 22°C |
| October | 62°F 17°C |
| November | 46°F 8°C |
| December | 34°F 1°C |