Georgetown, Ontario climate data is summarized below. Average annual temperatures range from 39 °F (low) to 56.1 °F (high). Annual precipitation averages 35 Inches. Georgetown is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -22.7 °F | -18.6 °F | 406.4 in. |
| February | -23.3 °F | -18.8 °F | 533.4 in. |
| March | -20.1 °F | -14.9 °F | 1498.6 in. |
| April | -16.5 °F | -10.7 °F | 2362.2 in. |
| May | -13 °F | -6.7 °F | 2692.4 in. |
| June | -10.1 °F | -4 °F | 2514.6 in. |
| July | -8.6 °F | -2.4 °F | 2565.4 in. |
| August | -9 °F | -2.9 °F | 3251.2 in. |
| September | -11.3 °F | -5.3 °F | 2006.6 in. |
| October | -14.5 °F | -9.5 °F | 1905 in. |
| November | -17.7 °F | -13.3 °F | 1574.8 in. |
| December | -20.5 °F | -17.1 °F | 1295.4 in. |
| Annual | 39 °F | 56.1 °F | 35.04 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |