Fillmore, Utah has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.8 °F (low) to 65.1 °F (high). Annual precipitation averages 15.5 Inches. Fillmore is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.2 °F | 39.8 °F | 1.41 in. |
| February | 22.2 °F | 45.5 °F | 1.49 in. |
| March | 28.9 °F | 55.8 °F | 1.64 in. |
| April | 34.0 °F | 62.7 °F | 1.89 in. |
| May | 41.9 °F | 72.7 °F | 1.55 in. |
| June | 50.5 °F | 84.2 °F | 0.73 in. |
| July | 59.2 °F | 91.8 °F | 0.66 in. |
| August | 58.1 °F | 89.6 °F | 0.68 in. |
| September | 48.2 °F | 80.5 °F | 1.13 in. |
| October | 36.6 °F | 66.8 °F | 1.66 in. |
| November | 25.9 °F | 52.0 °F | 1.26 in. |
| December | 17.7 °F | 40.0 °F | 1.44 in. |
| Annual | 36.8 °F | 65.1 °F | 15.54 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |