Tampico, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.1 °C (low) to 15 °C (high). Annual precipitation averages 347.2 Millimeters. Tampico is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 2.4 °C | 61.21 mm |
| February | -3.8 °C | 5.8 °C | 40.39 mm |
| March | -1.6 °C | 10.1 °C | 32.77 mm |
| April | 1.1 °C | 14.3 °C | 21.08 mm |
| May | 4.7 °C | 19.6 °C | 25.15 mm |
| June | 7.8 °C | 23.3 °C | 17.27 mm |
| July | 11 °C | 28.6 °C | 9.14 mm |
| August | 10.6 °C | 28.3 °C | 6.86 mm |
| September | 6.8 °C | 23.4 °C | 8.64 mm |
| October | 1.8 °C | 15.5 °C | 29.46 mm |
| November | -2.4 °C | 7.3 °C | 35.56 mm |
| December | -5.4 °C | 1.8 °C | 59.69 mm |
| Annual | 2.1 °C | 15 °C | 347.22 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |