Lima, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3.1 °C (low) to 11.5 °C (high). Annual precipitation averages 283.5 Millimeters. Lima is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 11 - Aug. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.4 °C | -1.8 °C | 8.64 mm |
| February | -12.1 °C | 0 °C | 10.16 mm |
| March | -7.8 °C | 4.9 °C | 13.72 mm |
| April | -3.7 °C | 10.3 °C | 30.73 mm |
| May | 0.6 °C | 15.7 °C | 44.7 mm |
| June | 4.4 °C | 20.8 °C | 56.13 mm |
| July | 7.7 °C | 26.9 °C | 27.69 mm |
| August | 6.8 °C | 26.4 °C | 25.15 mm |
| September | 2.7 °C | 20.8 °C | 20.83 mm |
| October | -2.7 °C | 12.3 °C | 27.43 mm |
| November | -8.1 °C | 3.8 °C | 8.64 mm |
| December | -12.7 °C | -2.1 °C | 9.65 mm |
| Annual | -3.1 °C | 11.5 °C | 283.47 mm |
| Average First Frost Date | Aug. 11 - Aug. 20 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |