Bancroft, Ontario climate data is summarized below. Average annual temperatures range from -0.8 °C (low) to 11.1 °C (high). Annual precipitation averages 311 Millimeters. Bancroft is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.07 °C | -4.49 °C | 0 mm |
| February | -15.98 °C | -4.02 °C | 0 mm |
| March | -9.31 °C | 2.56 °C | 10 mm |
| April | -1.66 °C | 11.08 °C | 21 mm |
| May | 4.75 °C | 18.96 °C | 30 mm |
| June | 10.13 °C | 23.07 °C | 52 mm |
| July | 12.32 °C | 25.4 °C | 68 mm |
| August | 11.54 °C | 24.43 °C | 65 mm |
| September | 6.71 °C | 19.96 °C | 31 mm |
| October | 2.13 °C | 12.53 °C | 21 mm |
| November | -4.12 °C | 5.54 °C | 7 mm |
| December | -10.6 °C | -1.96 °C | 6 mm |
| Annual | -0.8 °C | 11.1 °C | 311 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |