May Creek, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.6 °F (low) to 60.3 °F (high). Annual precipitation averages 71.1 Inches. May Creek is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.2 °F | 45.7 °F | 9.5 in. |
| February | 34.4 °F | 48.9 °F | 6.62 in. |
| March | 36.6 °F | 53.1 °F | 7.18 in. |
| April | 40.2 °F | 58.8 °F | 6.16 in. |
| May | 45.7 °F | 65.8 °F | 4.65 in. |
| June | 49.9 °F | 69.7 °F | 3.9 in. |
| July | 53.3 °F | 76.8 °F | 1.44 in. |
| August | 53.2 °F | 77.7 °F | 1.69 in. |
| September | 49.1 °F | 71.6 °F | 3.38 in. |
| October | 43.2 °F | 60.6 °F | 7.33 in. |
| November | 37.8 °F | 50.5 °F | 10.28 in. |
| December | 33.9 °F | 44.7 °F | 8.92 in. |
| Annual | 42.6 °F | 60.3 °F | 71.05 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |