Thompson, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.1 °F (low) to 50.2 °F (high). Annual precipitation averages 22.9 Inches. Thompson 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 | -2.3 °F | 15.2 °F | 0.61 in. |
| February | 1.4 °F | 20.2 °F | 0.57 in. |
| March | 15.4 °F | 33.0 °F | 0.88 in. |
| April | 30.4 °F | 51.2 °F | 1.1 in. |
| May | 43.1 °F | 65.9 °F | 2.93 in. |
| June | 54.7 °F | 75.4 °F | 4.08 in. |
| July | 58.2 °F | 79.8 °F | 3.56 in. |
| August | 55.3 °F | 79.3 °F | 3.01 in. |
| September | 46.3 °F | 70.3 °F | 2.63 in. |
| October | 33.9 °F | 54.4 °F | 1.95 in. |
| November | 19.4 °F | 36.1 °F | 0.83 in. |
| December | 5.9 °F | 21.2 °F | 0.78 in. |
| Annual | 30.1 °F | 50.2 °F | 22.93 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 |