Island Lake, IL Weather & Climate Normals
Island Lake's real weather, in one number
Island Lake, IL scores 44/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Island Lake's hottest and coldest months
Island Lake's hottest month is Jul, averaging 73°F; its coldest is Jan, averaging 22°F, a 51.1°F swing across the year, one of the widest gaps in this dataset.
Island Lake's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 31°F | 13°F | 1.65in | 11in |
| Feb | 35°F | 16°F | 1.56in | 8.9in |
| Mar | 46°F | 26°F | 2.21in | 3.9in |
| Apr | 59°F | 37°F | 3.63in | 1in |
| May | 70°F | 47°F | 4.47in | 0in |
| Jun | 80°F | 57°F | 4.81in | 0in |
| Jul | 84°F | 62°F | 3.8in | 0in |
| Aug | 82°F | 60°F | 3.7in | 0in |
| Sep | 76°F | 51°F | 3.61in | 0in |
| Oct | 63°F | 40°F | 3.21in | 0.1in |
| Nov | 48°F | 29°F | 2.38in | 1.4in |
| Dec | 36°F | 19°F | 1.94in | 8.2in |
May, Jun, Jul, Aug, and Sep are the best time to see Island Lake at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Island Lake
Island Lake averages 36.97in of precipitation a year across roughly 119 days with measurable rain or snow, and 34.5in of snow a year.
Where Island Lake ranks
Island Lake ranks 3874 of 4876 US cities in this dataset for comfort score, and 214 of 330 within IL. About 8,066 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Mc Henry -Wg Stratton L&D, IL US, 3.4 miles from Island Lake, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure