Florissant, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 23.7 °F (low) to 56.8 °F (high). Annual precipitation averages 14.2 Inches. Florissant is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.7 °F | 38.1 °F | 0.39 in. |
| February | 7.1 °F | 39.4 °F | 0.39 in. |
| March | 15.5 °F | 47.0 °F | 0.85 in. |
| April | 22.3 °F | 53.0 °F | 1.08 in. |
| May | 30.4 °F | 62.1 °F | 1.46 in. |
| June | 38.3 °F | 74.0 °F | 1.41 in. |
| July | 44.0 °F | 78.6 °F | 3.09 in. |
| August | 42.9 °F | 75.9 °F | 2.77 in. |
| September | 35.0 °F | 70.0 °F | 1.32 in. |
| October | 24.2 °F | 58.9 °F | 0.64 in. |
| November | 14.6 °F | 46.6 °F | 0.47 in. |
| December | 4.9 °F | 37.8 °F | 0.34 in. |
| Annual | 23.7 °F | 56.8 °F | 14.21 in. |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |