Idlewild, California has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 45.3 °F (low) to 69.9 °F (high). Annual precipitation averages 22.6 Inches. Idlewild is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.8 °F | 55.7 °F | 4.24 in. |
| February | 35.3 °F | 55.0 °F | 4.61 in. |
| March | 37.2 °F | 59.2 °F | 3.5 in. |
| April | 40.1 °F | 63.2 °F | 2.0 in. |
| May | 46.2 °F | 72.2 °F | 0.88 in. |
| June | 52.9 °F | 82.2 °F | 0.33 in. |
| July | 60.3 °F | 89.5 °F | 0.06 in. |
| August | 59.9 °F | 89.3 °F | 0.09 in. |
| September | 55.4 °F | 83.9 °F | 0.14 in. |
| October | 47.0 °F | 72.6 °F | 1.0 in. |
| November | 39.9 °F | 62.1 °F | 2.02 in. |
| December | 34.6 °F | 54.2 °F | 3.77 in. |
| Annual | 45.3 °F | 69.9 °F | 22.64 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |