Olympia, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.9 °C (low) to 16.3 °C (high). Annual precipitation averages 1459.5 Millimeters. Olympia is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °C | 8.3 °C | 217.42 mm |
| February | 1.5 °C | 9.9 °C | 138.18 mm |
| March | 2.7 °C | 12.5 °C | 157.73 mm |
| April | 4.3 °C | 15.3 °C | 104.65 mm |
| May | 7.3 °C | 19.2 °C | 66.04 mm |
| June | 9.7 °C | 21.6 °C | 49.53 mm |
| July | 11.6 °C | 25.2 °C | 17.78 mm |
| August | 11.6 °C | 25.7 °C | 31.5 mm |
| September | 9.3 °C | 22.6 °C | 52.07 mm |
| October | 6.1 °C | 16 °C | 143.51 mm |
| November | 3.2 °C | 10.9 °C | 252.73 mm |
| December | 1.5 °C | 7.8 °C | 228.35 mm |
| Annual | 5.9 °C | 16.3 °C | 1459.49 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |