| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 34°F | 21°F | 0.2" |
| February | 13°F | 36°F | 24°F | 0.3" |
| March | 21°F | 47°F | 33°F | 0.4" |
| April | 25°F | 53°F | 38°F | 1.1" |
| May | 33°F | 62°F | 47°F | 1.8" |
| June | 42°F | 77°F | 60°F | 1.3" |
| July | 49°F | 83°F | 66°F | 1.6" |
| August | 46°F | 80°F | 63°F | 1.2" |
| September | 39°F | 72°F | 55°F | 1.2" |
| October | 29°F | 58°F | 42°F | 1.1" |
| November | 20°F | 46°F | 33°F | 0.4" |
| December | 10°F | 33°F | 21°F | 0.3" |
| Index | Centennial | Wyoming | National |
| Air quality index | 47 | 39 | 42 |
| Pollution index | 1,157,410 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 247 |
| Days with moderate air quality | 118 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Woods Landing-Jelm, WY | 134 | 47 | 6.0% |
| Albany, WY | 42 | 47 | 6.0% |
| Centennial, WY | 292 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Idledale, CO | 292 | 58 | 16.0% |
| Baldwin, IL | 292 | 54 | 8.0% |
| Campbell Hill, IL | 292 | 43 | 14.0% |
| Joy, IL | 292 | 32 | 36.0% |
| Vallonia, IN | 292 | 35 | 30.0% |
| Centennial, WY | 292 | 47 | 6.0% |
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