Limestone, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.1 °C (low) to 9.5 °C (high). Annual precipitation averages 1112.3 Millimeters. Limestone is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.6 °C | -6.8 °C | 93.73 mm |
| February | -16.8 °C | -5.1 °C | 70.36 mm |
| March | -10.3 °C | 0.3 °C | 77.22 mm |
| April | -2.3 °C | 7.8 °C | 85.34 mm |
| May | 4.7 °C | 16.6 °C | 88.9 mm |
| June | 10 °C | 21.8 °C | 102.62 mm |
| July | 13.2 °C | 24.4 °C | 107.95 mm |
| August | 12 °C | 23.8 °C | 98.81 mm |
| September | 7.6 °C | 19.2 °C | 91.69 mm |
| October | 1.6 °C | 11.4 °C | 106.43 mm |
| November | -4 °C | 3.8 °C | 89.41 mm |
| December | -11.7 °C | -2.8 °C | 99.82 mm |
| Annual | -1.1 °C | 9.5 °C | 1112.28 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |