Bell Hill, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42 °F (low) to 58.8 °F (high). Annual precipitation averages 23.4 Inches. Bell Hill is located in USDA Plant Hardiness Zone 8a. 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 | 34.0 °F | 43.1 °F | 2.88 in. |
| February | 33.1 °F | 45.1 °F | 2.38 in. |
| March | 35.6 °F | 49.1 °F | 2.14 in. |
| April | 39.4 °F | 58.3 °F | 1.77 in. |
| May | 43.2 °F | 66.2 °F | 1.73 in. |
| June | 46.9 °F | 71.2 °F | 1.25 in. |
| July | 52.2 °F | 73.9 °F | 0.78 in. |
| August | 53.3 °F | 74.8 °F | 0.69 in. |
| September | 51.3 °F | 73.4 °F | 1.14 in. |
| October | 44.2 °F | 60.0 °F | 2.2 in. |
| November | 37.1 °F | 47.6 °F | 3.35 in. |
| December | 33.1 °F | 42.9 °F | 3.04 in. |
| Annual | 42 °F | 58.8 °F | 23.35 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |