Billings, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.5 °F (low) to 61.9 °F (high). Annual precipitation averages 14.9 Inches. Billings is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.5 °F | 37.8 °F | 0.52 in. |
| February | 16.9 °F | 41.7 °F | 0.52 in. |
| March | 24.8 °F | 51.9 °F | 0.96 in. |
| April | 33.4 °F | 59.9 °F | 1.86 in. |
| May | 42.4 °F | 69.2 °F | 2.36 in. |
| June | 50.9 °F | 79.1 °F | 2.35 in. |
| July | 56.8 °F | 88.9 °F | 1.31 in. |
| August | 54.4 °F | 87.7 °F | 0.84 in. |
| September | 45.4 °F | 77.0 °F | 1.49 in. |
| October | 34.1 °F | 62.1 °F | 1.51 in. |
| November | 23.8 °F | 48.6 °F | 0.59 in. |
| December | 16.0 °F | 38.5 °F | 0.58 in. |
| Annual | 34.5 °F | 61.9 °F | 14.89 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |