| 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 21 - May 31 | |
| 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 58203 - Grand Forks, ND | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -5 | 3 | 16 | 31 | 44 | 53 | 57 | 55 | 45 | 33 | 18 | 2 | 29 |
| Avg Max Temp (°F) | 14 | 22 | 34 | 53 | 69 | 77 | 81 | 80 | 69 | 55 | 33 | 19 | 50 |
| Avg Precip (In.) | .72 | .57 | .9 | 1.17 | 2.18 | 3.08 | 3 | 2.83 | 2.07 | 1.62 | .89 | .55 | 19.59 |