| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 53b - Kettle Moraines |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 60073 - Round Lake, IL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 26 | 37 | 47 | 56 | 62 | 61 | 52 | 41 | 30 | 18 | 38 |
| Avg Max Temp (°F) | 28 | 33 | 44 | 56 | 69 | 79 | 82 | 80 | 73 | 62 | 46 | 33 | 57 |
| Avg Precip (In.) | 1.64 | 1.41 | 2.32 | 3.7 | 3.59 | 4.12 | 3.86 | 4.41 | 3.45 | 2.51 | 2.82 | 2.08 | 35.9 |