Swede Heaven, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 41.1 °F (low) to 59.5 °F (high). Annual precipitation averages 71.3 Inches. Swede Heaven 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 | 32.0 °F | 42.7 °F | 10.18 in. |
| February | 32.4 °F | 46.5 °F | 6.7 in. |
| March | 34.7 °F | 51.4 °F | 8.08 in. |
| April | 38.6 °F | 58.6 °F | 5.41 in. |
| May | 44.4 °F | 66.2 °F | 3.7 in. |
| June | 49.0 °F | 71.2 °F | 2.64 in. |
| July | 52.6 °F | 78.2 °F | 1.3 in. |
| August | 52.7 °F | 79.3 °F | 1.74 in. |
| September | 48.1 °F | 71.8 °F | 3.35 in. |
| October | 41.4 °F | 58.7 °F | 7.44 in. |
| November | 35.8 °F | 47.8 °F | 11.17 in. |
| December | 31.9 °F | 41.8 °F | 9.56 in. |
| Annual | 41.1 °F | 59.5 °F | 71.27 in. |
| 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 : 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 |