Murphy, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 38.9 °F (low) to 64.7 °F (high). Annual precipitation averages 8.9 Inches. Murphy is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.0 °F | 39.8 °F | 1.04 in. |
| February | 27.0 °F | 46.5 °F | 0.73 in. |
| March | 32.2 °F | 56.0 °F | 0.93 in. |
| April | 36.6 °F | 63.1 °F | 0.88 in. |
| May | 44.3 °F | 72.1 °F | 1.24 in. |
| June | 51.1 °F | 80.7 °F | 0.74 in. |
| July | 58.1 °F | 91.7 °F | 0.23 in. |
| August | 56.2 °F | 90.4 °F | 0.21 in. |
| September | 47.6 °F | 80.4 °F | 0.39 in. |
| October | 37.6 °F | 66.0 °F | 0.65 in. |
| November | 28.9 °F | 50.3 °F | 0.82 in. |
| December | 23.5 °F | 39.8 °F | 1.08 in. |
| Annual | 38.9 °F | 64.7 °F | 8.94 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |