Limestone, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30 °F (low) to 49.2 °F (high). Annual precipitation averages 43.8 Inches. 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 | 0.3 °F | 19.8 °F | 3.69 in. |
| February | 1.7 °F | 22.8 °F | 2.77 in. |
| March | 13.5 °F | 32.5 °F | 3.04 in. |
| April | 27.9 °F | 46.1 °F | 3.36 in. |
| May | 40.5 °F | 61.8 °F | 3.5 in. |
| June | 50.0 °F | 71.2 °F | 4.04 in. |
| July | 55.7 °F | 75.9 °F | 4.25 in. |
| August | 53.6 °F | 74.9 °F | 3.89 in. |
| September | 45.7 °F | 66.6 °F | 3.61 in. |
| October | 34.8 °F | 52.6 °F | 4.19 in. |
| November | 24.8 °F | 38.9 °F | 3.52 in. |
| December | 10.9 °F | 26.9 °F | 3.93 in. |
| Annual | 30 °F | 49.2 °F | 43.79 in. |
| 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 : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |