Rockford Bay, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.2 °C (low) to 14.2 °C (high). Annual precipitation averages 675.4 Millimeters. Rockford Bay 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 | -4.3 °C | 2.1 °C | 87.12 mm |
| February | -4.1 °C | 4.4 °C | 61.72 mm |
| March | -1.8 °C | 8.9 °C | 67.56 mm |
| April | 0.9 °C | 13.3 °C | 53.09 mm |
| May | 4.8 °C | 18.7 °C | 53.59 mm |
| June | 8 °C | 22 °C | 46.23 mm |
| July | 10.6 °C | 28.1 °C | 16.51 mm |
| August | 10.3 °C | 28.4 °C | 19.05 mm |
| September | 6.3 °C | 22.8 °C | 26.42 mm |
| October | 1.7 °C | 14.4 °C | 56.39 mm |
| November | -1.7 °C | 6.3 °C | 84.84 mm |
| December | -4.6 °C | 1.5 °C | 102.87 mm |
| Annual | 2.2 °C | 14.2 °C | 675.39 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |