Swift Trail Junction, Arizona has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 9.1 °C (low) to 27.1 °C (high). Annual precipitation averages 243.6 Millimeters. Swift Trail Junction is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.7 °C | 16.3 °C | 19.81 mm |
| February | 1.2 °C | 18.8 °C | 19.56 mm |
| March | 4.1 °C | 22.7 °C | 13.72 mm |
| April | 7 °C | 27.2 °C | 6.6 mm |
| May | 11.7 °C | 32.1 °C | 5.33 mm |
| June | 17 °C | 36.9 °C | 6.35 mm |
| July | 20.8 °C | 36.8 °C | 41.15 mm |
| August | 20.1 °C | 35.5 °C | 49.02 mm |
| September | 16.4 °C | 33.3 °C | 28.19 mm |
| October | 9.3 °C | 28.6 °C | 17.27 mm |
| November | 3.1 °C | 21.6 °C | 13.46 mm |
| December | -0.6 °C | 15.7 °C | 23.11 mm |
| Annual | 9.1 °C | 27.1 °C | 243.57 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |