Historical weather data, all-time temperature records, and monthly climate averages for Frankfort, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Frankfort runs mild but unpredictable — expect a high near 54° and a low around 34°, with a 36% chance of rain. The date has seen a 58-degree swing in its history, from a bitter 18° in 1995 to a sunny 76° back in 2005.
Frankfort doesn't mess around at the extremes — the thermometer has swung from a scorching 103° in August 1988 all the way down to -27° in January 1985, a 130-degree range. A single July storm in 1996 dropped 6.55 inches of rain, and a February 2011 blizzard buried the town under 19 inches of snow in one day.
Summer is the main event here, with highs peaking around 84-85° in mid-July alongside the year's heaviest rainfall. Winters are genuinely cold — January highs barely crack 30° — so plan accordingly if you're visiting between December and February. Spring and fall offer a comfortable middle ground, with April highs in the upper 50s and October climbing into the mid-60s.