Napierville, Quebec climate data is summarized below. Average annual temperatures range from 2.6 °C (low) to 12.1 °C (high). Annual precipitation averages 510 Millimeters. Napierville 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 | -12.3 °C | -3.81 °C | 7 mm |
| February | -12.07 °C | -3.5 °C | 9 mm |
| March | -6.15 °C | 3.25 °C | 28 mm |
| April | 1.62 °C | 11.97 °C | 57 mm |
| May | 8.45 °C | 19.66 °C | 56 mm |
| June | 13.54 °C | 23.96 °C | 68 mm |
| July | 15.98 °C | 26.69 °C | 83 mm |
| August | 15.03 °C | 25.66 °C | 49 mm |
| September | 10.34 °C | 21.13 °C | 38 mm |
| October | 4.92 °C | 13.65 °C | 60 mm |
| November | -0.83 °C | 6.75 °C | 37 mm |
| December | -7.57 °C | -0.88 °C | 18 mm |
| Annual | 2.6 °C | 12.1 °C | 510 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |