Weather in Sullivan
Sullivan has chilly winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 20°, and about 13 inches of snow falls in a normal winter.
Getting the latest forecast from the National Weather Service…
Where today sits in Sullivan’s year
Typical highs and lows month by month, from 30 years of NOAA records.
Weather talk
Road reports, first frosts and storm memories from neighbors in Sullivan.
Your answer becomes a post in Town Square.
Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Sullivan itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Sullivan 3s, IL (3 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.