Oakland, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.5 °C (low) to 12.6 °C (high). Annual precipitation averages 1113.8 Millimeters. Oakland is located in USDA Plant Hardiness Zone 5b. 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 | -12.9 °C | -2.1 °C | 80.01 mm |
| February | -12 °C | -0.3 °C | 67.82 mm |
| March | -6.4 °C | 4.4 °C | 80.01 mm |
| April | 0.2 °C | 11.6 °C | 95.25 mm |
| May | 6.2 °C | 18.4 °C | 86.36 mm |
| June | 11.5 °C | 23.2 °C | 104.39 mm |
| July | 14.7 °C | 26.2 °C | 88.65 mm |
| August | 13.8 °C | 25.7 °C | 90.17 mm |
| September | 9.4 °C | 21.6 °C | 95.25 mm |
| October | 3.4 °C | 14.4 °C | 127.51 mm |
| November | -2.1 °C | 7.4 °C | 98.81 mm |
| December | -8.2 °C | 1.2 °C | 99.57 mm |
| Annual | 1.5 °C | 12.6 °C | 1113.8 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |