South Cle Elum, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 36 °F (low) to 57 °F (high). Annual precipitation averages 24.4 Inches. South Cle Elum is located in USDA Plant Hardiness Zone 7a. 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 | 23.4 °F | 35.1 °F | 3.79 in. |
| February | 24.4 °F | 40.7 °F | 2.64 in. |
| March | 28.3 °F | 48.0 °F | 2.18 in. |
| April | 33.4 °F | 55.8 °F | 1.34 in. |
| May | 40.6 °F | 64.8 °F | 1.24 in. |
| June | 46.9 °F | 70.6 °F | 0.93 in. |
| July | 52.4 °F | 79.9 °F | 0.45 in. |
| August | 51.6 °F | 80.6 °F | 0.34 in. |
| September | 43.9 °F | 72.4 °F | 0.78 in. |
| October | 35.3 °F | 58.1 °F | 2.23 in. |
| November | 28.3 °F | 43.3 °F | 3.92 in. |
| December | 23.1 °F | 34.7 °F | 4.59 in. |
| Annual | 36 °F | 57 °F | 24.43 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |