Tweed, Ontario climate data is summarized below. Average annual temperatures range from 1.4 °C (low) to 12.6 °C (high). Annual precipitation averages 557 Millimeters. Tweed 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 | -12.92 °C | -3.08 °C | 7 mm |
| February | -13.75 °C | -2.88 °C | 2 mm |
| March | -7.62 °C | 3.8 °C | 25 mm |
| April | 0.48 °C | 12.5 °C | 47 mm |
| May | 6.96 °C | 20.26 °C | 64 mm |
| June | 12.33 °C | 24.62 °C | 83 mm |
| July | 14.62 °C | 27.2 °C | 106 mm |
| August | 13.68 °C | 26.09 °C | 78 mm |
| September | 8.85 °C | 21.57 °C | 58 mm |
| October | 3.87 °C | 14.13 °C | 42 mm |
| November | -2.08 °C | 7.05 °C | 26 mm |
| December | -8.18 °C | -0.26 °C | 19 mm |
| Annual | 1.4 °C | 12.6 °C | 557 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 |