Tillamook, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.5 °F (low) to 59.6 °F (high). Annual precipitation averages 86.9 Inches. Tillamook is located in USDA Plant Hardiness Zone 9a. 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 | 38.4 °F | 50.8 °F | 12.24 in. |
| February | 37.7 °F | 52.1 °F | 9.33 in. |
| March | 38.5 °F | 53.9 °F | 9.58 in. |
| April | 40.5 °F | 57.1 °F | 7.41 in. |
| May | 44.8 °F | 61.4 °F | 4.5 in. |
| June | 48.8 °F | 65.0 °F | 3.2 in. |
| July | 51.2 °F | 68.6 °F | 0.95 in. |
| August | 51.4 °F | 70.1 °F | 1.19 in. |
| September | 48.4 °F | 68.9 °F | 3.03 in. |
| October | 44.4 °F | 62.6 °F | 7.98 in. |
| November | 40.5 °F | 54.5 °F | 12.8 in. |
| December | 37.9 °F | 50.0 °F | 14.65 in. |
| Annual | 43.5 °F | 59.6 °F | 86.86 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |