Fleming, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 35.5 °F (low) to 64.1 °F (high). Annual precipitation averages 17.4 Inches. Fleming 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 | 15.7 °F | 41.3 °F | 0.3 in. |
| February | 17.0 °F | 43.4 °F | 0.43 in. |
| March | 25.0 °F | 53.7 °F | 0.84 in. |
| April | 32.2 °F | 61.3 °F | 1.8 in. |
| May | 42.9 °F | 70.5 °F | 2.92 in. |
| June | 53.2 °F | 83.0 °F | 2.57 in. |
| July | 59.6 °F | 90.1 °F | 2.85 in. |
| August | 56.9 °F | 87.5 °F | 2.22 in. |
| September | 48.0 °F | 79.6 °F | 1.38 in. |
| October | 34.9 °F | 64.9 °F | 1.19 in. |
| November | 24.5 °F | 51.9 °F | 0.46 in. |
| December | 15.9 °F | 41.4 °F | 0.39 in. |
| Annual | 35.5 °F | 64.1 °F | 17.35 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 |