Centennial, Wyoming has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -2.7 °C (low) to 11.5 °C (high). Annual precipitation averages 388.3 Millimeters. Centennial 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 Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11 °C | 0.2 °C | 33.02 mm |
| February | -10.6 °C | 1.2 °C | 28.19 mm |
| March | -7.7 °C | 5.4 °C | 30.73 mm |
| April | -4.3 °C | 9.4 °C | 43.18 mm |
| May | 0 °C | 14.9 °C | 43.43 mm |
| June | 4.4 °C | 21.2 °C | 32.51 mm |
| July | 7.9 °C | 25 °C | 32 mm |
| August | 6.8 °C | 24.2 °C | 29.46 mm |
| September | 2.8 °C | 19.7 °C | 29.72 mm |
| October | -2.3 °C | 12.4 °C | 25.65 mm |
| November | -7.4 °C | 4.8 °C | 29.21 mm |
| December | -10.8 °C | -0.1 °C | 31.24 mm |
| Annual | -2.7 °C | 11.5 °C | 388.34 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| 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 | Dfc - Subarctic With Cool Summers And Year Around Rainfall |