Brighton, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 35 °F (low) to 65.2 °F (high). Annual precipitation averages 13.6 Inches. Brighton is located in USDA Plant Hardiness Zone 5b. 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 | 15.2 °F | 44.0 °F | 0.38 in. |
| February | 17.5 °F | 45.4 °F | 0.43 in. |
| March | 26.1 °F | 56.4 °F | 1.07 in. |
| April | 33.1 °F | 62.5 °F | 1.76 in. |
| May | 42.8 °F | 71.3 °F | 2.37 in. |
| June | 52.1 °F | 83.7 °F | 1.37 in. |
| July | 57.9 °F | 89.8 °F | 1.47 in. |
| August | 55.6 °F | 87.5 °F | 1.54 in. |
| September | 46.8 °F | 79.7 °F | 1.15 in. |
| October | 34.1 °F | 65.8 °F | 0.97 in. |
| November | 23.8 °F | 53.1 °F | 0.68 in. |
| December | 15.1 °F | 43.1 °F | 0.36 in. |
| Annual | 35 °F | 65.2 °F | 13.55 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |