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 |
Looking for a place with a climate like Jacksonville? Explore and filter 150,000+ cities worldwide.
Explore on the MapMonthly Climate Chart
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
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →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
Interested in Jacksonville?
Hotels
Flights
Real Estate
Insurance
Connectivity
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 |