Montezuma, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 21 °F (low) to 47 °F (high). Annual precipitation averages 22.1 Inches. Montezuma is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 21 - Jun. 30 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.6 °F | 27.7 °F | 1.67 in. |
| February | 5.8 °F | 29.9 °F | 1.77 in. |
| March | 11.3 °F | 37.4 °F | 2.06 in. |
| April | 17.3 °F | 43.4 °F | 2.66 in. |
| May | 26.2 °F | 52.5 °F | 2.05 in. |
| June | 34.1 °F | 63.7 °F | 1.29 in. |
| July | 40.1 °F | 69.4 °F | 2.26 in. |
| August | 38.4 °F | 67.0 °F | 2.15 in. |
| September | 33.0 °F | 60.6 °F | 1.57 in. |
| October | 23.2 °F | 48.5 °F | 1.46 in. |
| November | 13.0 °F | 36.4 °F | 1.6 in. |
| December | 5.1 °F | 27.7 °F | 1.58 in. |
| Annual | 21 °F | 47 °F | 22.12 in. |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 21 - Jun. 30 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |