Columbia, IL Weather & Climate Normals
What a normal year in Columbia actually looks like
On the 30-year record NOAA keeps for Columbia, IL, the comfort score comes out to 48/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Columbia's weather actually swings
Average temperatures in Columbia run from 31°F in Jan up to 79°F in Jul, a 47.3°F seasonal swing, one of the widest gaps in this dataset.
Columbia, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 41°F | 22°F | 2.67in | 4.9in |
| Feb | 46°F | 26°F | 2.26in | 3.7in |
| Mar | 56°F | 35°F | 3.55in | 1.2in |
| Apr | 68°F | 45°F | 4.63in | 0.3in |
| May | 76°F | 56°F | 4.8in | 0in |
| Jun | 85°F | 65°F | 4.3in | 0in |
| Jul | 89°F | 69°F | 5.02in | 0in |
| Aug | 87°F | 67°F | 3.09in | 0in |
| Sep | 80°F | 59°F | 3.35in | 0in |
| Oct | 70°F | 46°F | 3.04in | 0in |
| Nov | 56°F | 35°F | 3.33in | 0.8in |
| Dec | 45°F | 27°F | 2.75in | 2.9in |
If you're timing a visit, Apr, May, Jun, Sep, and Oct are Columbia's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Columbia actually gets
Over a typical year, Columbia sees about 42.79in of precipitation a year across roughly 111 days with measurable rain or snow, with 13.8in of snow a year.
Columbia against the rest of the country
Out of 4876 cities scored here, Columbia comes in at 2421; within IL alone it ranks 62 of 330. Population is about 10,919.
Checking the actual forecast
These figures come from Cahokia, IL US, the NOAA station 7.6 miles from Columbia, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is