Havana, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.1 °C (low) to 11.4 °C (high). Annual precipitation averages 610.1 Millimeters. Havana is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.2 °C | -7.1 °C | 15.75 mm |
| February | -14.7 °C | -4.3 °C | 14.73 mm |
| March | -7.9 °C | 2.7 °C | 24.13 mm |
| April | -0.4 °C | 11.7 °C | 44.96 mm |
| May | 7.2 °C | 19.4 °C | 81.03 mm |
| June | 13.3 °C | 24.7 °C | 106.68 mm |
| July | 15.6 °C | 27.3 °C | 98.55 mm |
| August | 14.1 °C | 26.7 °C | 59.69 mm |
| September | 8.8 °C | 22.2 °C | 68.33 mm |
| October | 1.4 °C | 13.5 °C | 58.67 mm |
| November | -6.2 °C | 3.8 °C | 20.57 mm |
| December | -13 °C | -3.7 °C | 17.02 mm |
| Annual | 0.1 °C | 11.4 °C | 610.11 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |