Templeton, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.8 °C (low) to 13.5 °C (high). Annual precipitation averages 1231.1 Millimeters. Templeton 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 | -11 °C | -0.6 °C | 93.47 mm |
| February | -10.3 °C | 1.2 °C | 82.04 mm |
| March | -5.9 °C | 5.5 °C | 104.65 mm |
| April | 0.3 °C | 12.7 °C | 97.79 mm |
| May | 6.3 °C | 19.1 °C | 92.96 mm |
| June | 11.4 °C | 23.9 °C | 112.52 mm |
| July | 14.6 °C | 26.9 °C | 108.2 mm |
| August | 13.4 °C | 26 °C | 107.44 mm |
| September | 9.2 °C | 21.8 °C | 106.17 mm |
| October | 3.1 °C | 14.6 °C | 124.46 mm |
| November | -2 °C | 8.3 °C | 96.27 mm |
| December | -7.1 °C | 2.4 °C | 105.16 mm |
| Annual | 1.8 °C | 13.5 °C | 1231.13 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 |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |