May Creek, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.9 °C (low) to 15.7 °C (high). Annual precipitation averages 1804.7 Millimeters. 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 | 1.2 °C | 7.6 °C | 241.3 mm |
| February | 1.3 °C | 9.4 °C | 168.15 mm |
| March | 2.6 °C | 11.7 °C | 182.37 mm |
| April | 4.6 °C | 14.9 °C | 156.46 mm |
| May | 7.6 °C | 18.8 °C | 118.11 mm |
| June | 9.9 °C | 20.9 °C | 99.06 mm |
| July | 11.8 °C | 24.9 °C | 36.58 mm |
| August | 11.8 °C | 25.4 °C | 42.93 mm |
| September | 9.5 °C | 22 °C | 85.85 mm |
| October | 6.2 °C | 15.9 °C | 186.18 mm |
| November | 3.2 °C | 10.3 °C | 261.11 mm |
| December | 1.1 °C | 7.1 °C | 226.57 mm |
| Annual | 5.9 °C | 15.7 °C | 1804.67 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |