Ambrose, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.2 °C (low) to 10.2 °C (high). Annual precipitation averages 393.2 Millimeters. Ambrose is located in USDA Plant Hardiness Zone 3b. 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 | -18.2 °C | -7.8 °C | 9.65 mm |
| February | -16.1 °C | -5.3 °C | 8.13 mm |
| March | -9.4 °C | 1.3 °C | 16 mm |
| April | -2.2 °C | 11.2 °C | 24.89 mm |
| May | 4.3 °C | 18.2 °C | 52.32 mm |
| June | 10.1 °C | 22.7 °C | 87.88 mm |
| July | 12.5 °C | 26.3 °C | 64.26 mm |
| August | 11.3 °C | 26.7 °C | 41.66 mm |
| September | 5.9 °C | 20.9 °C | 38.86 mm |
| October | -1.1 °C | 11.8 °C | 26.67 mm |
| November | -8.6 °C | 1.6 °C | 13.21 mm |
| December | -15.2 °C | -5.2 °C | 9.65 mm |
| Annual | -2.2 °C | 10.2 °C | 393.18 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |