Rockland, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.6 °C (low) to 15.5 °C (high). Annual precipitation averages 314.7 Millimeters. Rockland is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 1.1 °C | 28.19 mm |
| February | -6.6 °C | 3.8 °C | 21.34 mm |
| March | -2.9 °C | 9.8 °C | 26.42 mm |
| April | -0.3 °C | 14.2 °C | 36.32 mm |
| May | 3.8 °C | 19.7 °C | 39.88 mm |
| June | 7.2 °C | 25.3 °C | 27.18 mm |
| July | 10.8 °C | 31.1 °C | 12.45 mm |
| August | 10.1 °C | 30.4 °C | 15.49 mm |
| September | 5.4 °C | 24.6 °C | 23.62 mm |
| October | 0.4 °C | 16.4 °C | 26.92 mm |
| November | -4.2 °C | 7.8 °C | 25.4 mm |
| December | -8 °C | 1.5 °C | 31.5 mm |
| Annual | 0.6 °C | 15.5 °C | 314.71 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |