#1Winthrop Harbor
Lake County · 6,525 peopleJuly high·January low 17°·7 days of 90°+ a year
Winthrop Harbor, #1 on this list · Henry I. Paddock House · Photo: Nyttend · Public domainIllinois rankings · Climate
Towns with the coolest summers in Illinois
Winthrop Harbor has the coolest summers of Illinois’ 713 towns of 2,500+: July afternoons average a high of 81° (NOAA 1991–2020 normals). The typical town here averages 84°; none of the 713 stay under 80°.
The average July high. NOAA U.S. Climate Normals, 1991–2020, from NOAA’s 5 km grid at each town’s center; one town for each grid cell. A described list: no letters. How grades work
#181°
#T2North Chicago
Lake County · 34,050 peopleJuly high·January low 17°·11 days of 90°+ a year
#T2Waukegan Township
Lake County · 89,045 peopleJuly high·January low 17°·11 days of 90°+ a year
All 713 towns
July high, lowest first. Towns with the same figure share a rank (T = tied; 705 towns here).
713 towns ranked. Not here? See why a town may be missing.
#TownJuly highDays ≥90°January low
Quick answers
Questions people ask
Which Illinois town has the coolest summers?
Winthrop Harbor (Lake County): July afternoons average a high of 81°. North Chicago (82°) and Waukegan Township (82°) follow.
How are these towns ranked?
By the average July high (the warmest month’s afternoons), lowest first, on NOAA’s 1991–2020 normals, read from its 5 km grid at each town’s center. Towns with the same figure share a rank (T); the figure and the state rank are the ones on each town’s Climate page. How grades work.
Why isn’t my town on this list?
The list covers towns of 2,500+ residents, one for each of NOAA’s 5 km grid cells (713 in Illinois): where towns share a cell, one of them stands for it, since the grid gives them the same figures. Every town’s own figures are on its Climate page. Every town is on the Illinois page.
Go deeper
All Illinois rankings →More Illinois lists
Every list ranks the same 2,500+ towns, so a town’s rank means the same thing on each.
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