| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 43°F | 29°F | 0.2" |
| February | 18°F | 45°F | 29°F | 0.4" |
| March | 26°F | 58°F | 40°F | 0.8" |
| April | 33°F | 64°F | 47°F | 1.9" |
| May | 41°F | 72°F | 55°F | 3.1" |
| June | 52°F | 86°F | 68°F | 2.0" |
| July | 58°F | 93°F | 74°F | 1.6" |
| August | 56°F | 90°F | 71°F | 1.2" |
| September | 46°F | 81°F | 62°F | 1.0" |
| October | 34°F | 66°F | 48°F | 1.2" |
| November | 24°F | 55°F | 38°F | 0.3" |
| December | 14°F | 41°F | 26°F | 0.3" |
| Index | Hartville | Wyoming | National |
| Air quality index | 19 | 39 | 42 |
| Pollution index | 106,337 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 113 |
| Days with good air quality | 110 |
| Days with moderate air quality | 3 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fort Laramie, WY | 207 | 19 | 62.0% |
| Guernsey, WY | 1,025 | 19 | 62.0% |
| Hartville, WY | 51 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Egegik, AK | 51 | 31 | 38.0% |
| Big Flat, AR | 51 | 36 | 28.0% |
| Felsenthal, AR | 51 | 35 | 30.0% |
| McDougal, AR | 51 | 26 | 48.0% |
| Padre Ranchitos, AZ | 51 | 45 | 10.0% |
| Hartville, WY | 51 | 19 | 62.0% |
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