Historical weather data, all-time temperature records, and monthly climate averages for Effingham, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Effingham typically lands in that awkward shoulder season — expect a high around 60° and a low near 38°. The date has seen wild swings over 115 years of records, from a scorching 85° in 1929 down to a bitter 22° in 1920. There's about a 1-in-3 chance of rain today, but snow is essentially off the table.
Effingham's weather has real teeth at the extremes — the thermometer hit a brutal 111° in July 1936 and plunged to -29° in January 1915, a 140-degree swing between all-time records. On the wet side, a single June day in 2008 dropped 5.7 inches of rain, and a December 1973 snowstorm buried the area under 14.5 inches.
Summer is the headliner here, with average highs peaking at 89° during the week of July 9–15 — prime time for heat and humidity. Winters are cold but not brutal, with the coolest stretch in mid-January averaging just 37°. If you're trying to dodge rain, avoid mid-June, which is the wettest stretch of the year averaging over an inch of precip in a single week.