Lolo, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 59 °F (high). Annual precipitation averages 13.7 Inches. 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 | 18.6 °F | 35.0 °F | 0.99 in. |
| February | 20.4 °F | 39.9 °F | 1.06 in. |
| March | 26.0 °F | 49.9 °F | 0.86 in. |
| April | 31.8 °F | 58.1 °F | 1.29 in. |
| May | 38.8 °F | 67.7 °F | 1.73 in. |
| June | 45.3 °F | 74.9 °F | 1.76 in. |
| July | 49.8 °F | 86.6 °F | 0.74 in. |
| August | 48.2 °F | 85.6 °F | 0.75 in. |
| September | 40.9 °F | 74.6 °F | 0.88 in. |
| October | 32.5 °F | 58.7 °F | 1.16 in. |
| November | 24.8 °F | 42.9 °F | 1.36 in. |
| December | 18.7 °F | 33.9 °F | 1.14 in. |
| Annual | 33 °F | 59 °F | 13.72 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |