Georgetown, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3.2 °C (low) to 12.7 °C (high). Annual precipitation averages 435.1 Millimeters. Georgetown is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.8 °C | -1.5 °C | 43.18 mm |
| February | -12.8 °C | 0.4 °C | 34.8 mm |
| March | -7.8 °C | 5.6 °C | 38.35 mm |
| April | -3.2 °C | 11.1 °C | 38.1 mm |
| May | 1.2 °C | 16.8 °C | 59.69 mm |
| June | 4.5 °C | 22.4 °C | 33.02 mm |
| July | 7.7 °C | 28.3 °C | 19.81 mm |
| August | 6.9 °C | 27.9 °C | 24.38 mm |
| September | 2.2 °C | 22.3 °C | 35.31 mm |
| October | -2.7 °C | 14.2 °C | 36.32 mm |
| November | -7.7 °C | 5.5 °C | 32.26 mm |
| December | -13 °C | -0.9 °C | 39.88 mm |
| Annual | -3.2 °C | 12.7 °C | 435.1 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |