Effingham, IL Weather & Climate Normals
Effingham's real weather, in one number
Effingham, IL scores 42/100 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. 4 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Effingham's hottest and coldest months
Effingham's hottest month is Jul, averaging 77°F; its coldest is Jan, averaging 29°F, a 48.5°F swing across the year, one of the widest gaps in this dataset.
Effingham's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 37°F | 20°F | 2.93in | 5.3in |
| Feb | 43°F | 23°F | 2.44in | 4.6in |
| Mar | 54°F | 32°F | 3.3in | 1.5in |
| Apr | 66°F | 42°F | 4.84in | 0.2in |
| May | 76°F | 54°F | 5.27in | 0in |
| Jun | 85°F | 63°F | 4.87in | 0in |
| Jul | 89°F | 66°F | 4.29in | 0in |
| Aug | 87°F | 64°F | 3.19in | 0in |
| Sep | 81°F | 56°F | 2.89in | 0in |
| Oct | 69°F | 44°F | 3.49in | 0in |
| Nov | 54°F | 34°F | 3.73in | 0.6in |
| Dec | 42°F | 25°F | 2.77in | 2.4in |
May, Jun, Sep, and Oct are the best time to see Effingham at its mildest; the rest of the year, plan around Jul's heat and Jan's cold.
Rain and snow in Effingham
Effingham averages 44.01in of precipitation a year across roughly 116 days with measurable rain or snow, and 14.6in of snow a year.
Where Effingham ranks
Effingham ranks 4237 of 4876 US cities in this dataset for comfort score, and 283 of 330 within IL. About 12,434 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Effingham 3sw, IL US, 3.9 miles from Effingham, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station