Louisville, Colorado has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 37 °F (low) to 65 °F (high). Annual precipitation averages 16.8 Inches. Louisville is located in USDA Plant Hardiness Zone 6a. 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 | 19.3 °F | 45.8 °F | 0.55 in. |
| February | 20.6 °F | 46.7 °F | 0.69 in. |
| March | 28.0 °F | 55.7 °F | 1.48 in. |
| April | 34.3 °F | 61.4 °F | 2.38 in. |
| May | 43.3 °F | 70.1 °F | 2.81 in. |
| June | 52.4 °F | 82.5 °F | 1.46 in. |
| July | 58.6 °F | 88.6 °F | 1.91 in. |
| August | 56.6 °F | 86.5 °F | 1.37 in. |
| September | 48.4 °F | 78.6 °F | 1.49 in. |
| October | 36.6 °F | 65.6 °F | 1.28 in. |
| November | 26.9 °F | 53.8 °F | 0.87 in. |
| December | 19.2 °F | 45.1 °F | 0.52 in. |
| Annual | 37 °F | 65 °F | 16.81 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |