Saint-Leonard, New Brunswick climate data is summarized below. Average annual temperatures range from -1.4 °C (low) to 8.8 °C (high). Annual precipitation averages 823 Millimeters. Saint-Leonard is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.93 °C | -7.03 °C | 0 mm |
| February | -15.7 °C | -5.65 °C | 0 mm |
| March | -11.69 °C | -0.52 °C | 11 mm |
| April | -3.14 °C | 7.06 °C | 57 mm |
| May | 3.93 °C | 15.59 °C | 90 mm |
| June | 9.23 °C | 20.43 °C | 121 mm |
| July | 12.52 °C | 23.69 °C | 160 mm |
| August | 11.85 °C | 23.12 °C | 112 mm |
| September | 6.85 °C | 18.22 °C | 87 mm |
| October | 1.78 °C | 10.84 °C | 92 mm |
| November | -3.75 °C | 3.76 °C | 77 mm |
| December | -12 °C | -3.68 °C | 16 mm |
| Annual | -1.4 °C | 8.8 °C | 823 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |