Bonanza, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 25.4 °F (low) to 52.3 °F (high). Annual precipitation averages 21.5 Inches. Bonanza is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.7 °F | 32.7 °F | 1.49 in. |
| February | 10.7 °F | 34.8 °F | 1.93 in. |
| March | 16.8 °F | 42.3 °F | 1.89 in. |
| April | 22.9 °F | 49.1 °F | 2.6 in. |
| May | 30.8 °F | 58.5 °F | 1.99 in. |
| June | 38.4 °F | 70.3 °F | 1.02 in. |
| July | 44.1 °F | 74.3 °F | 2.36 in. |
| August | 42.5 °F | 71.9 °F | 2.24 in. |
| September | 36.3 °F | 65.7 °F | 1.41 in. |
| October | 27.8 °F | 54.3 °F | 1.66 in. |
| November | 16.9 °F | 41.6 °F | 1.29 in. |
| December | 9.1 °F | 32.6 °F | 1.6 in. |
| Annual | 25.4 °F | 52.3 °F | 21.48 in. |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 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 | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |