Swede Heaven, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.1 °C (low) to 15.3 °C (high). Annual precipitation averages 1810.3 Millimeters. 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 | 0 °C | 5.9 °C | 258.57 mm |
| February | 0.2 °C | 8.1 °C | 170.18 mm |
| March | 1.5 °C | 10.8 °C | 205.23 mm |
| April | 3.7 °C | 14.8 °C | 137.41 mm |
| May | 6.9 °C | 19 °C | 93.98 mm |
| June | 9.4 °C | 21.8 °C | 67.06 mm |
| July | 11.4 °C | 25.7 °C | 33.02 mm |
| August | 11.5 °C | 26.3 °C | 44.2 mm |
| September | 8.9 °C | 22.1 °C | 85.09 mm |
| October | 5.2 °C | 14.8 °C | 188.98 mm |
| November | 2.1 °C | 8.8 °C | 283.72 mm |
| December | -0.1 °C | 5.4 °C | 242.82 mm |
| Annual | 5.1 °C | 15.3 °C | 1810.26 mm |
| 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 : -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 |