Hazelton, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.2 °C (low) to 16.4 °C (high). Annual precipitation averages 276.9 Millimeters. Hazelton is located in USDA Plant Hardiness Zone 6b. 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 | -6.7 °C | 2.4 °C | 34.54 mm |
| February | -5.1 °C | 5.3 °C | 19.56 mm |
| March | -1.7 °C | 11.2 °C | 26.67 mm |
| April | 0.9 °C | 15.2 °C | 25.91 mm |
| May | 5.3 °C | 20.4 °C | 32.26 mm |
| June | 9.2 °C | 25.7 °C | 16.51 mm |
| July | 13.1 °C | 31.5 °C | 5.08 mm |
| August | 11.9 °C | 30.8 °C | 7.87 mm |
| September | 7.3 °C | 25.3 °C | 13.97 mm |
| October | 1.7 °C | 17.4 °C | 25.65 mm |
| November | -3.2 °C | 8.9 °C | 26.67 mm |
| December | -6.7 °C | 2.6 °C | 42.16 mm |
| Annual | 2.2 °C | 16.4 °C | 276.85 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |