Lebanon, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43 °F (low) to 63.9 °F (high). Annual precipitation averages 41.4 Inches. Lebanon 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.3 °F | 47.6 °F | 5.84 in. |
| February | 35.4 °F | 51.4 °F | 4.26 in. |
| March | 37.7 °F | 56.0 °F | 5.03 in. |
| April | 40.6 °F | 61.0 °F | 3.71 in. |
| May | 45.4 °F | 68.0 °F | 2.53 in. |
| June | 49.7 °F | 73.5 °F | 1.63 in. |
| July | 53.3 °F | 83.2 °F | 0.38 in. |
| August | 52.9 °F | 83.9 °F | 0.38 in. |
| September | 49.0 °F | 77.6 °F | 1.62 in. |
| October | 43.3 °F | 64.8 °F | 3.36 in. |
| November | 38.7 °F | 53.0 °F | 5.92 in. |
| December | 34.9 °F | 46.6 °F | 6.69 in. |
| Annual | 43 °F | 63.9 °F | 41.35 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |