Summit, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.7 °C (low) to 16.9 °C (high). Annual precipitation averages 1715.5 Millimeters. 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 | 1.4 °C | 7.4 °C | 256.54 mm |
| February | 1.6 °C | 9.4 °C | 199.14 mm |
| March | 2.6 °C | 12.1 °C | 194.56 mm |
| April | 4.2 °C | 15.6 °C | 149.1 mm |
| May | 6.9 °C | 20.3 °C | 83.06 mm |
| June | 9.3 °C | 23 °C | 54.36 mm |
| July | 10.4 °C | 27.5 °C | 12.19 mm |
| August | 10.5 °C | 28.1 °C | 16.26 mm |
| September | 9.7 °C | 24.5 °C | 54.61 mm |
| October | 6.5 °C | 17.2 °C | 137.41 mm |
| November | 3.6 °C | 10.6 °C | 258.06 mm |
| December | 1.3 °C | 6.9 °C | 300.23 mm |
| Annual | 5.7 °C | 16.9 °C | 1715.52 mm |
| 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 : -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 |