Lolo, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 15 °C (high). Annual precipitation averages 348.5 Millimeters. Lolo is located in USDA Plant Hardiness Zone 5b. 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 | -7.4 °C | 1.7 °C | 25.15 mm |
| February | -6.4 °C | 4.4 °C | 26.92 mm |
| March | -3.3 °C | 9.9 °C | 21.84 mm |
| April | -0.1 °C | 14.5 °C | 32.77 mm |
| May | 3.8 °C | 19.8 °C | 43.94 mm |
| June | 7.4 °C | 23.8 °C | 44.7 mm |
| July | 9.9 °C | 30.3 °C | 18.8 mm |
| August | 9 °C | 29.8 °C | 19.05 mm |
| September | 4.9 °C | 23.7 °C | 22.35 mm |
| October | 0.3 °C | 14.8 °C | 29.46 mm |
| November | -4 °C | 6.1 °C | 34.54 mm |
| December | -7.4 °C | 1.1 °C | 28.96 mm |
| Annual | 0.6 °C | 15 °C | 348.48 mm |
| 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |