Sweet Home, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.7 °C (low) to 17.5 °C (high). Annual precipitation averages 1262.6 Millimeters. Sweet Home is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.4 °C | 8.6 °C | 166.62 mm |
| February | 1.6 °C | 10.7 °C | 131.57 mm |
| March | 2.8 °C | 13.1 °C | 146.56 mm |
| April | 4.5 °C | 16 °C | 119.38 mm |
| May | 7.1 °C | 19.7 °C | 82.8 mm |
| June | 9.4 °C | 22.9 °C | 55.63 mm |
| July | 11.3 °C | 27.8 °C | 12.95 mm |
| August | 10.9 °C | 28.5 °C | 14.22 mm |
| September | 8.8 °C | 24.9 °C | 45.97 mm |
| October | 5.9 °C | 18.2 °C | 109.98 mm |
| November | 3.4 °C | 11.5 °C | 176.02 mm |
| December | 1.4 °C | 7.9 °C | 200.91 mm |
| Annual | 5.7 °C | 17.5 °C | 1262.61 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |