| 2023 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 3a: -40°F to -35°F | |
| 1990 Hardiness Zone: | Zone 3a: -40F to -35F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 50r - Chippewa Plains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 56633 - Cass Lake, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -9 | -2 | 13 | 28 | 41 | 51 | 56 | 54 | 44 | 33 | 17 | 0 | 27 |
| Avg Max Temp (°F) | 15 | 24 | 36 | 52 | 66 | 75 | 79 | 77 | 66 | 53 | 34 | 20 | 50 |
| Avg Precip (In.) | .83 | .63 | 1.23 | 1.82 | 2.81 | 4.01 | 4.27 | 3.41 | 2.81 | 2.54 | 1.37 | .69 | 26.43 |