Peterborough, Ontario climate data is summarized below. Average annual temperatures range from 34.3 °F (low) to 53.9 °F (high). Annual precipitation averages 21.9 Inches. 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 | -24.5 °F | -19.4 °F | 101.6 in. |
| February | -25 °F | -19.4 °F | 0 in. |
| March | -21.5 °F | -15.5 °F | 660.4 in. |
| April | -17.6 °F | -11.1 °F | 1016 in. |
| May | -14.2 °F | -7 °F | 1727.2 in. |
| June | -11.4 °F | -4.6 °F | 2362.2 in. |
| July | -10.1 °F | -3.2 °F | 2387.6 in. |
| August | -10.5 °F | -3.8 °F | 2590.8 in. |
| September | -13.2 °F | -6.2 °F | 1295.4 in. |
| October | -15.8 °F | -10.2 °F | 990.6 in. |
| November | -19.1 °F | -14 °F | 635 in. |
| December | -22.1 °F | -18 °F | 355.6 in. |
| Annual | 34.3 °F | 53.9 °F | 21.89 in. |
| 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 : -15°F to -10°F |
| Current Drought Conditions | Normal |