Olympia, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.6 °F (low) to 61.2 °F (high). Annual precipitation averages 57.5 Inches. 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 | 35.2 °F | 47.0 °F | 8.56 in. |
| February | 34.7 °F | 49.9 °F | 5.44 in. |
| March | 36.8 °F | 54.5 °F | 6.21 in. |
| April | 39.7 °F | 59.5 °F | 4.12 in. |
| May | 45.1 °F | 66.5 °F | 2.6 in. |
| June | 49.4 °F | 70.8 °F | 1.95 in. |
| July | 52.9 °F | 77.4 °F | 0.7 in. |
| August | 52.8 °F | 78.2 °F | 1.24 in. |
| September | 48.8 °F | 72.6 °F | 2.05 in. |
| October | 43.0 °F | 60.8 °F | 5.65 in. |
| November | 37.8 °F | 51.6 °F | 9.95 in. |
| December | 34.7 °F | 46.0 °F | 8.99 in. |
| Annual | 42.6 °F | 61.2 °F | 57.46 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |