Peterborough, Ontario climate data is summarized below. Average annual temperatures range from 1.3 °C (low) to 12.2 °C (high). Annual precipitation averages 556 Millimeters. Peterborough 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 | -12.11 °C | -2.9 °C | 4 mm |
| February | -12.99 °C | -2.85 °C | 0 mm |
| March | -6.75 °C | 4.09 °C | 26 mm |
| April | 0.31 °C | 12.05 °C | 40 mm |
| May | 6.38 °C | 19.45 °C | 68 mm |
| June | 11.52 °C | 23.73 °C | 93 mm |
| July | 13.77 °C | 26.2 °C | 94 mm |
| August | 13.08 °C | 25.2 °C | 102 mm |
| September | 8.29 °C | 20.89 °C | 51 mm |
| October | 3.62 °C | 13.56 °C | 39 mm |
| November | -2.38 °C | 6.77 °C | 25 mm |
| December | -7.74 °C | -0.33 °C | 14 mm |
| Annual | 1.3 °C | 12.2 °C | 556 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 |