Los Alamos, New Mexico has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.6 °C (low) to 17 °C (high). Annual precipitation averages 450.4 Millimeters. Los Alamos 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.3 °C | 5 °C | 21.34 mm |
| February | -5.1 °C | 7.5 °C | 18.29 mm |
| March | -1.9 °C | 11.9 °C | 25.4 mm |
| April | 1.1 °C | 16.4 °C | 25.15 mm |
| May | 5.6 °C | 21.6 °C | 29.72 mm |
| June | 11.1 °C | 27.6 °C | 27.43 mm |
| July | 13.1 °C | 28.7 °C | 68.33 mm |
| August | 12.2 °C | 27.2 °C | 96.01 mm |
| September | 8.7 °C | 24.1 °C | 48.26 mm |
| October | 3 °C | 17.9 °C | 40.89 mm |
| November | -2.4 °C | 10.7 °C | 24.89 mm |
| December | -7.1 °C | 5.2 °C | 24.64 mm |
| Annual | 2.6 °C | 17 °C | 450.35 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |