Bowmanville, Ontario climate data is summarized below. Average annual temperatures range from 3.9 °C (low) to 12.3 °C (high). Annual precipitation averages 933 Millimeters. Bowmanville 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 | -8.12 °C | -0.88 °C | 28 mm |
| February | -9.36 °C | -1.35 °C | 25 mm |
| March | -3.79 °C | 4.42 °C | 74 mm |
| April | 2.17 °C | 10.94 °C | 111 mm |
| May | 7.78 °C | 17.32 °C | 95 mm |
| June | 13.14 °C | 22.24 °C | 96 mm |
| July | 15.93 °C | 25.38 °C | 97 mm |
| August | 15.61 °C | 24.93 °C | 99 mm |
| September | 11.5 °C | 20.86 °C | 66 mm |
| October | 6.3 °C | 14.17 °C | 84 mm |
| November | 0.47 °C | 7.85 °C | 79 mm |
| December | -4.45 °C | 1.7 °C | 79 mm |
| Annual | 3.9 °C | 12.3 °C | 933 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |