Sandy, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.6 °C (low) to 15.8 °C (high). Annual precipitation averages 1460 Millimeters. Sandy 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.1 °C | 7.3 °C | 186.44 mm |
| February | 1.3 °C | 9.3 °C | 141.22 mm |
| March | 2.5 °C | 11.7 °C | 153.92 mm |
| April | 4.1 °C | 14.3 °C | 137.92 mm |
| May | 6.6 °C | 18.4 °C | 107.7 mm |
| June | 9.1 °C | 20.8 °C | 76.45 mm |
| July | 11.1 °C | 25.4 °C | 19.81 mm |
| August | 11.2 °C | 25.9 °C | 22.86 mm |
| September | 9.4 °C | 22.8 °C | 62.74 mm |
| October | 6.4 °C | 16.2 °C | 133.6 mm |
| November | 3.3 °C | 10.4 °C | 200.66 mm |
| December | 1.1 °C | 7 °C | 216.66 mm |
| Annual | 5.6 °C | 15.8 °C | 1459.98 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 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 | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |