Gypsum, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.7 °C (low) to 15.5 °C (high). Annual precipitation averages 309.9 Millimeters. Gypsum is located in USDA Plant Hardiness Zone 5b. 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 | -12.8 °C | 1.6 °C | 23.37 mm |
| February | -9.2 °C | 4.4 °C | 25.65 mm |
| March | -4.9 °C | 10.3 °C | 27.94 mm |
| April | -1.7 °C | 14.6 °C | 30.23 mm |
| May | 1.6 °C | 20.2 °C | 26.92 mm |
| June | 5.7 °C | 26.7 °C | 19.81 mm |
| July | 9.5 °C | 29.6 °C | 26.67 mm |
| August | 8.4 °C | 28.1 °C | 23.37 mm |
| September | 3.9 °C | 24.3 °C | 34.04 mm |
| October | -1.5 °C | 16.9 °C | 28.96 mm |
| November | -7.3 °C | 8.2 °C | 24.64 mm |
| December | -12.4 °C | 1.2 °C | 18.29 mm |
| Annual | -1.7 °C | 15.5 °C | 309.89 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Exceptional Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |