Loomis, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 38.1 °F (low) to 60 °F (high). Annual precipitation averages 13.2 Inches. Loomis 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.6 °F | 33.0 °F | 1.49 in. |
| February | 23.9 °F | 40.1 °F | 1.0 in. |
| March | 30.6 °F | 51.0 °F | 1.07 in. |
| April | 36.6 °F | 61.3 °F | 0.9 in. |
| May | 44.4 °F | 71.0 °F | 1.35 in. |
| June | 50.9 °F | 77.3 °F | 1.36 in. |
| July | 56.8 °F | 86.9 °F | 0.83 in. |
| August | 56.2 °F | 86.5 °F | 0.65 in. |
| September | 47.7 °F | 76.5 °F | 0.5 in. |
| October | 37.3 °F | 59.7 °F | 0.98 in. |
| November | 29.1 °F | 43.7 °F | 1.41 in. |
| December | 22.3 °F | 33.4 °F | 1.68 in. |
| Annual | 38.1 °F | 60 °F | 13.22 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |