Warren, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.4 °C (low) to 12.7 °C (high). Annual precipitation averages 1311.7 Millimeters. Warren is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.9 °C | -0.8 °C | 111.76 mm |
| February | -9.9 °C | 0.7 °C | 95.76 mm |
| March | -4.9 °C | 4.8 °C | 118.36 mm |
| April | 0.7 °C | 11.3 °C | 119.89 mm |
| May | 6.4 °C | 17.2 °C | 96.01 mm |
| June | 11.4 °C | 22.1 °C | 107.44 mm |
| July | 14.8 °C | 25.3 °C | 83.06 mm |
| August | 14.2 °C | 25 °C | 78.74 mm |
| September | 10.3 °C | 21.1 °C | 111.51 mm |
| October | 4.4 °C | 14.4 °C | 138.18 mm |
| November | -0.8 °C | 8.3 °C | 124.21 mm |
| December | -6.6 °C | 2.5 °C | 126.75 mm |
| Annual | 2.4 °C | 12.7 °C | 1311.67 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |