Cahokia Heights, IL climate
Cahokia Heights has chilly winters and warm summers. A typical July afternoon reaches 89°, a January night drops to 24°, and about 14 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Cahokia Heights feels like
Winter
Spring
Summer
Fall
Cahokia Heights weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 41° | 24° | 2.5" | 4.9" | 9 | 7 | 26° – 42° |
| February | 46° | 27° | 2.1" | 3.7" | 8 | 4 | 27° – 46° |
| March | 56° | 36° | 3.4" | 1.2" | 10 | 1 | 39° – 59° |
| April | 68° | 45° | 4.7" | 0.3" | 12 | 0 | 50° – 62° |
| May | 77° | 56° | 5.0" | 0 | 12 | 0 | 62° – 74° |
| June | 86° | 65° | 4.3" | 0 | 10 | 0 | 70° – 80° |
| July | 89° | 69° | 3.8" | 0 | 8 | 0 | 74° – 86° |
| August | 88° | 67° | 3.2" | 0 | 8 | 0 | 72° – 83° |
| September | 81° | 59° | 3.4" | 0 | 7 | 0 | 65° – 76° |
| October | 69° | 47° | 3.1" | 0 | 8 | 0 | 53° – 64° |
| November | 56° | 36° | 3.3" | 0.8" | 8 | 1 | 38° – 53° |
| December | 45° | 28° | 2.7" | 2.9" | 10 | 4 | 22° – 45° |
| Year | 67° | 47° | 41.7" | 13.8" | 111 | 15 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Cahokia Heights
Cahokia Heights gets 42 inches of rain and melted snow a year. May is the wettest month and February the driest. Rain or snow falls on about 111 days a year. Snow covers the ground about 15 days of the year.
About 200 frost-free days a year
In half of years the last 32° night comes by April 8 and the first one by October 26. That leaves about 200 frost-free days for gardens, longer than 72% of U.S. towns.
Heating and cooling a home in Cahokia Heights
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Cahokia Heights, 75% of that work is heating and 25% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Cahokia Heights and its neighbors
Cahokia Heights borders 8 towns with climate data. January nights across them vary by 0.2°. Belleville has the coldest January nights (23°) and Centreville the hottest July afternoons (89°). Cahokia Heights’s January low is 24° and its July high 89°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Cahokia Heights compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Cahokia Heights averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.2°). The shift is smaller than in 63% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Cahokia Heights’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 22° to 45°. June is the most reliable, staying within 10°.
Common questions about Cahokia Heights’s climate
What is the coldest month in Cahokia Heights?
January, with a typical high of 41° and a low of 24°.
What is the hottest month in Cahokia Heights?
July, with a typical high of 89° and a low of 69°. About 46 days a year reach 90°.
How much snow does Cahokia Heights get?
About 14 inches in a normal winter, most of it in January.
When is the first frost in Cahokia Heights?
In half of years the first 32° night comes by October 26, and the last spring frost by April 8.
What is the rainiest month in Cahokia Heights?
May, with 5.0 inches of rain and melted snow. The year totals 42 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Cahokia Heights itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Cahokia, IL (2 mi, snow) and Cahokia St Louis Airport, IL (1 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.