Georgetown, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3.9 °C (low) to 11.4 °C (high). Annual precipitation averages 480.1 Millimeters. Georgetown 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.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.1 °C | 1.1 °C | 23.11 mm |
| February | -12.1 °C | 1.8 °C | 25.15 mm |
| March | -8.8 °C | 5.8 °C | 41.91 mm |
| April | -5.6 °C | 9.1 °C | 62.99 mm |
| May | -1.1 °C | 14.1 °C | 54.36 mm |
| June | 3.2 °C | 20.7 °C | 35.05 mm |
| July | 6.4 °C | 23.8 °C | 63.5 mm |
| August | 5.3 °C | 22.6 °C | 53.85 mm |
| September | 1.7 °C | 18.9 °C | 39.37 mm |
| October | -3.2 °C | 12.2 °C | 33.02 mm |
| November | -8.4 °C | 5.6 °C | 23.62 mm |
| December | -12.3 °C | 1 °C | 24.13 mm |
| Annual | -3.9 °C | 11.4 °C | 480.06 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 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 | Dfb - Humid Continental Mild Summer, Wet All Year |