Arundel, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.4 °C (low) to 14.2 °C (high). Annual precipitation averages 1244.1 Millimeters. Arundel is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.4 °C | 0.8 °C | 89.66 mm |
| February | -8.6 °C | 2.1 °C | 90.93 mm |
| March | -3.9 °C | 6.3 °C | 115.32 mm |
| April | 1.7 °C | 12.9 °C | 111.25 mm |
| May | 7.3 °C | 19.1 °C | 93.98 mm |
| June | 12.7 °C | 23.9 °C | 111.25 mm |
| July | 15.9 °C | 27 °C | 84.58 mm |
| August | 15.1 °C | 26.4 °C | 88.65 mm |
| September | 10.9 °C | 22.5 °C | 96.27 mm |
| October | 5 °C | 15.8 °C | 134.62 mm |
| November | -0.3 °C | 9.6 °C | 109.98 mm |
| December | -5.6 °C | 3.8 °C | 117.6 mm |
| Annual | 3.4 °C | 14.2 °C | 1244.09 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |