Bethalto, IL Weather & Climate Normals
Bethalto's real weather, in one number
Bethalto, IL scores 49/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Bethalto's hottest and coldest months
Bethalto's hottest month is Jul, averaging 78°F; its coldest is Jan, averaging 30°F, a 47.9°F swing across the year, one of the widest gaps in this dataset.
Bethalto's weather across the year
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 39°F | 22°F | 2.53in |
| Feb | 44°F | 25°F | 2.52in |
| Mar | 54°F | 35°F | 3.46in |
| Apr | 66°F | 45°F | 4.92in |
| May | 75°F | 56°F | 5.46in |
| Jun | 84°F | 66°F | 3.4in |
| Jul | 87°F | 69°F | 3.95in |
| Aug | 86°F | 67°F | 3.3in |
| Sep | 80°F | 60°F | 3.38in |
| Oct | 68°F | 48°F | 2.93in |
| Nov | 54°F | 37°F | 3.43in |
| Dec | 44°F | 27°F | 2.59in |
Apr, May, Jun, Sep, and Oct are the best time to see Bethalto at its mildest; the rest of the year, plan around Jul's heat and Jan's cold.
Rain and snow in Bethalto
Over a typical year, Bethalto sees about 41.87in of precipitation a year across roughly 99 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where Bethalto ranks
Bethalto ranks 2201 of 4876 US cities in this dataset for comfort score, and 21 of 330 within IL. About 9,183 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Alton - Melvin Price L&D, IL US, 6.1 miles from Bethalto, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · How the comfort score is calculated