Rigby, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.7 °C (low) to 13.7 °C (high). Annual precipitation averages 299.7 Millimeters. Rigby is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.5 °C | -1.8 °C | 28.45 mm |
| February | -9.6 °C | 0.8 °C | 18.03 mm |
| March | -4.4 °C | 7.7 °C | 24.38 mm |
| April | -0.9 °C | 13.7 °C | 31.24 mm |
| May | 3.4 °C | 18.7 °C | 43.69 mm |
| June | 7 °C | 23.4 °C | 28.45 mm |
| July | 10.1 °C | 29.3 °C | 11.68 mm |
| August | 9.1 °C | 29 °C | 16.76 mm |
| September | 4.9 °C | 23.2 °C | 24.64 mm |
| October | -0.6 °C | 15.1 °C | 26.67 mm |
| November | -5.7 °C | 5.9 °C | 20.32 mm |
| December | -10.6 °C | -1.1 °C | 25.4 mm |
| Annual | -0.7 °C | 13.7 °C | 299.71 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |