| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 40°F | 24°F | 0.6" |
| February | 14°F | 42°F | 27°F | 0.8" |
| March | 23°F | 54°F | 37°F | 1.2" |
| April | 29°F | 60°F | 44°F | 1.9" |
| May | 37°F | 68°F | 52°F | 3.4" |
| June | 46°F | 81°F | 63°F | 2.0" |
| July | 53°F | 92°F | 73°F | 0.9" |
| August | 51°F | 90°F | 69°F | 0.6" |
| September | 42°F | 80°F | 59°F | 1.7" |
| October | 32°F | 64°F | 46°F | 1.7" |
| November | 20°F | 51°F | 34°F | 1.0" |
| December | 10°F | 37°F | 22°F | 0.7" |
| Index | Dayton | Wyoming | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 562,118 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 325 |
| Days with moderate air quality | 40 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Parkman, WY | 371 | 39 | 22.0% |
| Ranchester, WY | 1,062 | 39 | 22.0% |
| Sheridan, WY | 17,938 | 39 | 22.0% |
| Big Horn, WY | 382 | 39 | 22.0% |
| Dayton, WY | 879 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Millville, CA | 879 | 42 | 16.0% |
| Barnes Lake-Millers Lake, MI | 879 | 38 | 24.0% |
| Hay Lake 209, AB | 879 | n/a | |
| Penryn, CA | 878 | 52 | 4.0% |
| La Jara, CO | 880 | 15 | 70.0% |
| Dayton, WY | 879 | 39 | 22.0% |
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