Upper Grand Lagoon, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.9 °C (low) to 24.6 °C (high). Annual precipitation averages 1532.1 Millimeters. Upper Grand Lagoon is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.6 °C | 16.3 °C | 110.24 mm |
| February | 8.2 °C | 17.9 °C | 114.81 mm |
| March | 11.5 °C | 20.7 °C | 131.06 mm |
| April | 15.1 °C | 23.9 °C | 112.01 mm |
| May | 19.3 °C | 27.7 °C | 71.12 mm |
| June | 23.3 °C | 30.3 °C | 137.67 mm |
| July | 24.3 °C | 31.1 °C | 176.78 mm |
| August | 23.9 °C | 31 °C | 196.09 mm |
| September | 22.1 °C | 30.1 °C | 145.03 mm |
| October | 16.9 °C | 26.4 °C | 103.38 mm |
| November | 10.9 °C | 21.4 °C | 122.68 mm |
| December | 8.1 °C | 17.8 °C | 111.25 mm |
| Annual | 15.9 °C | 24.6 °C | 1532.12 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |