Linneus, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.6 °C (low) to 10.8 °C (high). Annual precipitation averages 1120.6 Millimeters. Linneus is located in USDA Plant Hardiness Zone 4b. 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 | -15.9 °C | -5 °C | 91.44 mm |
| February | -15.1 °C | -3.3 °C | 71.37 mm |
| March | -9 °C | 2.1 °C | 85.6 mm |
| April | -1.7 °C | 9.4 °C | 86.36 mm |
| May | 4.6 °C | 17.5 °C | 90.17 mm |
| June | 9.8 °C | 22.4 °C | 106.68 mm |
| July | 13.1 °C | 25.2 °C | 95.76 mm |
| August | 12.1 °C | 24.8 °C | 88.39 mm |
| September | 7.8 °C | 20.3 °C | 86.87 mm |
| October | 1.9 °C | 12.6 °C | 109.47 mm |
| November | -3.6 °C | 5.1 °C | 100.33 mm |
| December | -10.6 °C | -1.4 °C | 108.2 mm |
| Annual | -0.6 °C | 10.8 °C | 1120.64 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 4b : -31.7°C to -28.9°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 |