Georgetown, Ontario climate data is summarized below. Average annual temperatures range from 3.9 °C (low) to 13.4 °C (high). Annual precipitation averages 890 Millimeters. 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 | -8.85 °C | -1.56 °C | 16 mm |
| February | -9.91 °C | -1.78 °C | 21 mm |
| March | -4.14 °C | 5.18 °C | 59 mm |
| April | 2.25 °C | 12.79 °C | 93 mm |
| May | 8.57 °C | 20.01 °C | 106 mm |
| June | 13.77 °C | 24.79 °C | 99 mm |
| July | 16.45 °C | 27.69 °C | 101 mm |
| August | 15.86 °C | 26.76 °C | 128 mm |
| September | 11.6 °C | 22.42 °C | 79 mm |
| October | 5.99 °C | 14.93 °C | 75 mm |
| November | 0.13 °C | 8.1 °C | 62 mm |
| December | -4.96 °C | 1.17 °C | 51 mm |
| Annual | 3.9 °C | 13.4 °C | 890 mm |
| 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 : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |