| 2023 Hardiness Zone: | Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 48a - Glacial Lake Agassiz Basin | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 58012 - Casselton, ND | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -5 | 3 | 18 | 32 | 44 | 54 | 57 | 56 | 45 | 34 | 18 | 3 | 30 |
| Avg Max Temp (°F) | 15 | 24 | 36 | 54 | 70 | 79 | 83 | 83 | 72 | 58 | 36 | 22 | 53 |
| Avg Precip (In.) | .6 | .47 | .98 | 1.44 | 2.64 | 3.35 | 3.17 | 2.55 | 2.1 | 1.92 | .89 | .44 | 20.55 |