Meridian, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 39.2 °F (low) to 64.9 °F (high). Annual precipitation averages 12 Inches. Meridian 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 | 24.3 °F | 39.3 °F | 1.52 in. |
| February | 27.3 °F | 46.6 °F | 1.09 in. |
| March | 32.5 °F | 56.4 °F | 1.42 in. |
| April | 36.9 °F | 63.4 °F | 1.28 in. |
| May | 44.6 °F | 72.7 °F | 1.44 in. |
| June | 51.3 °F | 81.5 °F | 0.75 in. |
| July | 58.0 °F | 92.3 °F | 0.29 in. |
| August | 56.1 °F | 90.7 °F | 0.17 in. |
| September | 48.1 °F | 80.4 °F | 0.44 in. |
| October | 37.9 °F | 66.1 °F | 0.78 in. |
| November | 29.6 °F | 50.0 °F | 1.19 in. |
| December | 24.3 °F | 39.6 °F | 1.63 in. |
| Annual | 39.2 °F | 64.9 °F | 12 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 | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |