Regan, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.6 °F (low) to 52.3 °F (high). Annual precipitation averages 19 Inches. Regan is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.3 °F | 20.2 °F | 0.47 in. |
| February | 5.2 °F | 24.6 °F | 0.45 in. |
| March | 17.2 °F | 37.3 °F | 0.68 in. |
| April | 29.7 °F | 53.3 °F | 1.11 in. |
| May | 42.3 °F | 66.3 °F | 2.91 in. |
| June | 52.3 °F | 75.3 °F | 3.56 in. |
| July | 57.8 °F | 81.3 °F | 3.25 in. |
| August | 55.3 °F | 80.9 °F | 2.05 in. |
| September | 46.4 °F | 70.7 °F | 1.76 in. |
| October | 33.3 °F | 54.8 °F | 1.44 in. |
| November | 18.9 °F | 37.9 °F | 0.66 in. |
| December | 7.1 °F | 24.7 °F | 0.63 in. |
| Annual | 30.6 °F | 52.3 °F | 18.97 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |