Tillamook, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.4 °C (low) to 15.3 °C (high). Annual precipitation averages 2206.2 Millimeters. 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 | 3.6 °C | 10.4 °C | 310.9 mm |
| February | 3.2 °C | 11.2 °C | 236.98 mm |
| March | 3.6 °C | 12.2 °C | 243.33 mm |
| April | 4.7 °C | 13.9 °C | 188.21 mm |
| May | 7.1 °C | 16.3 °C | 114.3 mm |
| June | 9.3 °C | 18.3 °C | 81.28 mm |
| July | 10.7 °C | 20.3 °C | 24.13 mm |
| August | 10.8 °C | 21.2 °C | 30.23 mm |
| September | 9.1 °C | 20.5 °C | 76.96 mm |
| October | 6.9 °C | 17 °C | 202.69 mm |
| November | 4.7 °C | 12.5 °C | 325.12 mm |
| December | 3.3 °C | 10 °C | 372.11 mm |
| Annual | 6.4 °C | 15.3 °C | 2206.24 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |