Keystone Heights, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.3 °F (low) to 80.7 °F (high). Annual precipitation averages 53.4 Inches. Keystone Heights is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.9 °F | 67.0 °F | 3.41 in. |
| February | 45.5 °F | 70.4 °F | 2.89 in. |
| March | 50.0 °F | 76.0 °F | 3.37 in. |
| April | 56.0 °F | 81.2 °F | 2.67 in. |
| May | 62.9 °F | 87.2 °F | 4.12 in. |
| June | 69.8 °F | 90.3 °F | 8.08 in. |
| July | 72.0 °F | 91.5 °F | 7.26 in. |
| August | 71.9 °F | 90.8 °F | 6.65 in. |
| September | 69.5 °F | 87.9 °F | 6.66 in. |
| October | 61.2 °F | 81.9 °F | 3.42 in. |
| November | 51.4 °F | 74.6 °F | 2.08 in. |
| December | 46.1 °F | 69.2 °F | 2.77 in. |
| Annual | 58.3 °F | 80.7 °F | 53.38 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |