| 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 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F |
| 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: | 46c - Glacial Lake Basins |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 58368 - Rugby, ND | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -5 | 3 | 15 | 29 | 42 | 51 | 55 | 53 | 42 | 31 | 15 | 0 | 28 |
| Avg Max Temp (°F) | 15 | 23 | 35 | 54 | 69 | 77 | 82 | 81 | 69 | 56 | 34 | 20 | 51 |
| Avg Precip (In.) | .51 | .45 | .78 | 1.25 | 2.22 | 3.05 | 3.12 | 2.29 | 1.9 | 1.33 | .69 | .49 | 18.1 |