Blaine, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.8 °C (low) to 10.6 °C (high). Annual precipitation averages 1097.8 Millimeters. Blaine 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.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.8 °C | -5.6 °C | 87.63 mm |
| February | -15.8 °C | -3.8 °C | 65.79 mm |
| March | -9.5 °C | 1.6 °C | 78.23 mm |
| April | -1.7 °C | 9.2 °C | 82.8 mm |
| May | 4.7 °C | 17.5 °C | 91.19 mm |
| June | 10 °C | 22.7 °C | 108.46 mm |
| July | 13.1 °C | 25.4 °C | 101.35 mm |
| August | 12 °C | 24.8 °C | 91.95 mm |
| September | 7.8 °C | 20.3 °C | 88.9 mm |
| October | 2 °C | 12.4 °C | 109.98 mm |
| November | -3.7 °C | 4.6 °C | 93.98 mm |
| December | -11.1 °C | -1.9 °C | 97.54 mm |
| Annual | -0.8 °C | 10.6 °C | 1097.8 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| 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 |