Covington, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.5 °F (low) to 60.4 °F (high). Annual precipitation averages 47.9 Inches. Covington is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.3 °F | 46.6 °F | 6.38 in. |
| February | 35.2 °F | 49.2 °F | 4.48 in. |
| March | 37.4 °F | 53.3 °F | 5.28 in. |
| April | 40.7 °F | 58.5 °F | 4.24 in. |
| May | 46.3 °F | 65.5 °F | 2.7 in. |
| June | 50.6 °F | 69.9 °F | 2.41 in. |
| July | 54.2 °F | 76.4 °F | 1.01 in. |
| August | 54.4 °F | 76.9 °F | 1.33 in. |
| September | 50.3 °F | 71.0 °F | 2.14 in. |
| October | 44.1 °F | 60.1 °F | 4.86 in. |
| November | 38.6 °F | 51.2 °F | 6.81 in. |
| December | 34.7 °F | 45.6 °F | 6.3 in. |
| Annual | 43.5 °F | 60.4 °F | 47.94 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 |