Newberg, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.1 °F (low) to 63.3 °F (high). Annual precipitation averages 43.6 Inches. Newberg 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 | 35.9 °F | 47.3 °F | 6.85 in. |
| February | 36.2 °F | 51.1 °F | 4.68 in. |
| March | 38.4 °F | 55.8 °F | 4.7 in. |
| April | 41.4 °F | 60.7 °F | 3.34 in. |
| May | 46.7 °F | 67.9 °F | 2.42 in. |
| June | 50.9 °F | 73.3 °F | 1.54 in. |
| July | 54.7 °F | 81.8 °F | 0.31 in. |
| August | 54.7 °F | 82.3 °F | 0.45 in. |
| September | 50.8 °F | 76.2 °F | 1.36 in. |
| October | 44.6 °F | 63.8 °F | 3.78 in. |
| November | 39.3 °F | 52.8 °F | 6.67 in. |
| December | 35.4 °F | 46.4 °F | 7.46 in. |
| Annual | 44.1 °F | 63.3 °F | 43.56 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 |