Sandy, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.1 °F (low) to 60.5 °F (high). Annual precipitation averages 57.5 Inches. 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 | 34.0 °F | 45.2 °F | 7.34 in. |
| February | 34.3 °F | 48.7 °F | 5.56 in. |
| March | 36.5 °F | 53.1 °F | 6.06 in. |
| April | 39.4 °F | 57.8 °F | 5.43 in. |
| May | 43.9 °F | 65.1 °F | 4.24 in. |
| June | 48.4 °F | 69.5 °F | 3.01 in. |
| July | 51.9 °F | 77.8 °F | 0.78 in. |
| August | 52.1 °F | 78.7 °F | 0.9 in. |
| September | 48.9 °F | 73.1 °F | 2.47 in. |
| October | 43.6 °F | 61.1 °F | 5.26 in. |
| November | 38.0 °F | 50.7 °F | 7.9 in. |
| December | 33.9 °F | 44.6 °F | 8.53 in. |
| Annual | 42.1 °F | 60.5 °F | 57.48 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |