Summit, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.2 °F (low) to 62.4 °F (high). Annual precipitation averages 67.5 Inches. Summit 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.6 °F | 45.4 °F | 10.1 in. |
| February | 34.9 °F | 49.0 °F | 7.84 in. |
| March | 36.7 °F | 53.7 °F | 7.66 in. |
| April | 39.6 °F | 60.1 °F | 5.87 in. |
| May | 44.4 °F | 68.5 °F | 3.27 in. |
| June | 48.8 °F | 73.4 °F | 2.14 in. |
| July | 50.7 °F | 81.5 °F | 0.48 in. |
| August | 50.9 °F | 82.5 °F | 0.64 in. |
| September | 49.4 °F | 76.1 °F | 2.15 in. |
| October | 43.7 °F | 63.0 °F | 5.41 in. |
| November | 38.5 °F | 51.0 °F | 10.16 in. |
| December | 34.4 °F | 44.4 °F | 11.82 in. |
| Annual | 42.2 °F | 62.4 °F | 67.54 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |