Tillsonburg, Ontario climate data is summarized below. Average annual temperatures range from 3.9 °C (low) to 13.5 °C (high). Annual precipitation averages 510 Millimeters. Tillsonburg is located in USDA Plant Hardiness Zone 6b. 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 | -8.28 °C | -1.13 °C | 11 mm |
| February | -9.76 °C | -1.64 °C | 1 mm |
| March | -3.6 °C | 5.38 °C | 27 mm |
| April | 2.26 °C | 13.06 °C | 36 mm |
| May | 8.38 °C | 19.91 °C | 51 mm |
| June | 13.63 °C | 24.88 °C | 71 mm |
| July | 15.68 °C | 27.04 °C | 86 mm |
| August | 15.02 °C | 26.21 °C | 80 mm |
| September | 10.87 °C | 22.11 °C | 75 mm |
| October | 5.76 °C | 15.21 °C | 36 mm |
| November | 0.38 °C | 8.49 °C | 24 mm |
| December | -4.04 °C | 2.05 °C | 12 mm |
| Annual | 3.9 °C | 13.5 °C | 510 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |