| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F 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: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 46i - Drift Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 58401 - Jamestown, ND | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -2 | 5 | 17 | 30 | 43 | 53 | 57 | 55 | 44 | 33 | 17 | 4 | 30 |
| Avg Max Temp (°F) | 17 | 24 | 36 | 54 | 69 | 77 | 83 | 82 | 71 | 57 | 35 | 22 | 52 |
| Avg Precip (In.) | .57 | .46 | .83 | 1.33 | 2.24 | 3.19 | 3.18 | 2.33 | 1.88 | 1.44 | .69 | .4 | 18.53 |