Auburn, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7 °C (low) to 16.1 °C (high). Annual precipitation averages 1124.5 Millimeters. Auburn is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.2 °C | 8.7 °C | 163.83 mm |
| February | 2.2 °C | 10.2 °C | 105.41 mm |
| March | 3.6 °C | 12.4 °C | 122.17 mm |
| April | 5.5 °C | 15.2 °C | 85.85 mm |
| May | 8.6 °C | 18.9 °C | 55.37 mm |
| June | 11.2 °C | 21.2 °C | 49.02 mm |
| July | 13.1 °C | 24.6 °C | 20.57 mm |
| August | 13.1 °C | 24.7 °C | 28.45 mm |
| September | 10.8 °C | 21.6 °C | 47.5 mm |
| October | 7.3 °C | 15.8 °C | 111.25 mm |
| November | 4.1 °C | 11.3 °C | 167.39 mm |
| December | 2 °C | 8.2 °C | 167.64 mm |
| Annual | 7 °C | 16.1 °C | 1124.45 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 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 |