| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 41°F | 28°F | 0.7" |
| February | 17°F | 43°F | 29°F | 1.0" |
| March | 25°F | 53°F | 37°F | 1.5" |
| April | 29°F | 56°F | 41°F | 5.1" |
| May | 38°F | 65°F | 51°F | 5.4" |
| June | 48°F | 81°F | 64°F | 2.1" |
| July | 54°F | 86°F | 70°F | 4.3" |
| August | 52°F | 84°F | 67°F | 3.7" |
| September | 47°F | 77°F | 60°F | 5.3" |
| October | 35°F | 66°F | 49°F | 4.9" |
| November | 24°F | 53°F | 37°F | 2.1" |
| December | 15°F | 40°F | 27°F | 1.5" |
| Index | Hillsdale | Wyoming | National |
| Air quality index | 43 | 39 | 42 |
| Pollution index | 1,822,900 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 305 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Burns, WY | 453 | 43 | 14.0% |
| Carpenter, WY | 181 | 43 | 14.0% |
| Hillsdale, WY | 0 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Chase, AK | 0 | 31 | 38.0% |
| Chiniak, AK | 0 | 31 | 38.0% |
| Chisana, AK | 0 | 31 | 38.0% |
| Dot Lake, AK | 0 | 38 | 24.0% |
| Eureka Roadhouse, AK | 0 | 31 | 38.0% |
| Hillsdale, WY | 0 | 43 | 14.0% |
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