Bethalto, Illinois Climate
United States
Pop. 9,349 Elev. 160 m / 525 ft
TZ: America/Chicago (UTC-5) ·
Bethalto has warm summers with average highs of 88°F (31°C) in July, and frigid winters averaging 19°F (-7°C) in January. Humidity pushes the summer feels-like temperature to around 105°F (41°C). Rain falls on about 65 days per year (38.7 in / 982 mm total), with snow on 5 days and 29 in (725 mm) of annual accumulation. The city averages 129 sunny days per year and around 46 thunderstorm days. Nearby lake water reaches 83°F (28°C) in summer.
| Temperature | 88°F (31°C) high | 19°F (-7°C) low |
| Feels like | 105°F (41°C) high | 13°F (-10°C) low |
| Rain | 65 days | 38.7 in (982 mm) /yr |
| Snow | 5 days | 28.6 in (725 mm) /yr |
| Sky | 129 sunny | 46 stormy |
| Wind | 2.1 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 60
Feb 51
Mar 66
Apr 61
May 56
Jun 60
Jul 47
Aug 40
Sep 45
Oct 51
Nov 62
Dec Humidity (%)
66
Jan 64
Feb 52
Mar 61
Apr 64
May 72
Jun 77
Jul 70
Aug 63
Sep 66
Oct 68
Nov 73
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 21 mi St. Louis Lambert International Airport (STL)
Ski resort 42 mi Hidden Valley
National park 94 mi Emmett Till and Mamie Till-Mobley National Monument
Hospital 4 mi Alton Mental Health Center
Hiking trail 23 mi
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 35°F 2°C | 19°F -7°C | 0.5 in 13 mm | 12.8 in325 mm | 13 |
| February | 42°F 6°C | 26°F -3°C | 0.8 in 20 mm | 7.1 in179 mm | 9 |
| March | 65°F 18°C | 42°F 5°C | 3.0 in 76 mm | 0.5 in13 mm | 14 |
| April | 70°F 21°C | 49°F 9°C | 6.4 in 163 mm | — | 5 |
| May | 75°F 24°C | 56°F 14°C | 4.9 in 125 mm | — | 9 |
| June | 85°F 29°C | 69°F 21°C | 6.3 in 161 mm | — | 10 |
| July | 88°F 31°C | 74°F 23°C | 6.7 in 171 mm | — | 7 |
| August | 85°F 29°C | 66°F 19°C | 1.0 in 25 mm | — | 16 |
| September | 83°F 29°C | 59°F 15°C | 2.9 in 74 mm | — | 15 |
| October | 71°F 22°C | 52°F 11°C | 2.8 in 70 mm | — | 15 |
| November | 56°F 13°C | 39°F 4°C | 2.6 in 66 mm | 5.3 in135 mm | 10 |
| December | 43°F 6°C | 28°F -2°C | 0.7 in 19 mm | 2.9 in73 mm | 6 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 13 | 0 |
| February | 9 | 1 |
| March | 14 | 4 |
| April | 5 | 10 |
| May | 9 | 4 |
| June | 10 | 8 |
| July | 7 | 11 |
| August | 16 | 2 |
| September | 15 | 3 |
| October | 15 | 2 |
| November | 10 | 1 |
| December | 6 | 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 |