Laconia, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.3 °C (low) to 13.5 °C (high). Annual precipitation averages 1198.6 Millimeters. Laconia 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.2 °C | -1.3 °C | 78.49 mm |
| February | -10.7 °C | 0.4 °C | 82.55 mm |
| March | -5.8 °C | 5.3 °C | 85.6 mm |
| April | 0.6 °C | 12.9 °C | 96.52 mm |
| May | 7 °C | 19.9 °C | 91.19 mm |
| June | 12.2 °C | 24.4 °C | 109.98 mm |
| July | 15.3 °C | 27.5 °C | 118.87 mm |
| August | 14.3 °C | 26.6 °C | 102.36 mm |
| September | 10.1 °C | 22.2 °C | 105.66 mm |
| October | 3.8 °C | 14.7 °C | 131.06 mm |
| November | -1.4 °C | 7.9 °C | 95.25 mm |
| December | -6.9 °C | 1.9 °C | 101.09 mm |
| Annual | 2.3 °C | 13.5 °C | 1198.62 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |