Monterey, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8 °C (low) to 18.6 °C (high). Annual precipitation averages 1609.3 Millimeters. Monterey is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.3 °C | 6.4 °C | 141.73 mm |
| February | -1 °C | 8.8 °C | 141.22 mm |
| March | 2.4 °C | 13.6 °C | 152.65 mm |
| April | 7.3 °C | 19.1 °C | 146.81 mm |
| May | 12.6 °C | 23.6 °C | 135.89 mm |
| June | 16.7 °C | 27.2 °C | 138.43 mm |
| July | 18.7 °C | 28.8 °C | 143.26 mm |
| August | 18.2 °C | 28.6 °C | 111 mm |
| September | 14.7 °C | 25.7 °C | 118.62 mm |
| October | 8.2 °C | 20.2 °C | 92.71 mm |
| November | 2.7 °C | 13.2 °C | 117.86 mm |
| December | -1 °C | 8.2 °C | 169.16 mm |
| Annual | 8 °C | 18.6 °C | 1609.34 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |