Rugby, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.9 °F (low) to 49.6 °F (high). Annual precipitation averages 19.1 Inches. Rugby is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.3 °F | 15.6 °F | 0.49 in. |
| February | 0.2 °F | 20.2 °F | 0.52 in. |
| March | 13.4 °F | 32.6 °F | 0.72 in. |
| April | 27.9 °F | 51.0 °F | 1.01 in. |
| May | 40.9 °F | 65.0 °F | 2.63 in. |
| June | 52.1 °F | 73.8 °F | 3.73 in. |
| July | 56.2 °F | 79.2 °F | 3.32 in. |
| August | 53.2 °F | 79.2 °F | 2.22 in. |
| September | 43.8 °F | 69.6 °F | 1.72 in. |
| October | 30.7 °F | 53.2 °F | 1.44 in. |
| November | 16.3 °F | 34.9 °F | 0.68 in. |
| December | 3.3 °F | 20.7 °F | 0.63 in. |
| Annual | 27.9 °F | 49.6 °F | 19.11 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |