Historical weather data, all-time temperature records, and monthly climate averages for Mount Greenwood, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Mount Greenwood runs mild on average, with a typical high of 54° and a low of 37° — but the date has a wild range in the record books. It's hit 85° (1988) and bottomed out at 18° (1979), so don't pack away the layers just yet. There's also a 43% chance of rain today historically, with a small but real 7% shot at snow.
Mount Greenwood has seen some genuine extremes over its nearly century-long record. The thermometer once hit 107° in June 1934 and plunged to -25° in January 1985 — a swing of 132 degrees. On the wet side, a single July day in 1957 dropped 6.16 inches of rain, and a January 1999 storm buried the area under 17.6 inches of snow.
Summer is the clear sweet spot here, with average highs peaking at 85° during the week of July 9–15 and the wettest stretch following close behind in late July. Winter is cold and real — January highs hover around 31–32°, and the coldest week of the year averages just 31°. Spring and fall offer pleasant transitions, with April averaging 59° and October at 64°.