| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 39°F | 29°F | 0.7" |
| February | 23°F | 48°F | 34°F | 0.9" |
| March | 27°F | 55°F | 40°F | 1.9" |
| April | 30°F | 58°F | 43°F | 3.6" |
| May | 39°F | 65°F | 51°F | 3.9" |
| June | 50°F | 81°F | 65°F | 3.2" |
| July | 56°F | 87°F | 71°F | 5.0" |
| August | 54°F | 84°F | 68°F | 2.9" |
| September | 48°F | 78°F | 62°F | 3.4" |
| October | 37°F | 66°F | 50°F | 2.9" |
| November | 25°F | 52°F | 37°F | 1.9" |
| December | 16°F | 40°F | 27°F | 1.1" |
| Index | La Grange | Wyoming | National |
| Air quality index | 19 | 39 | 42 |
| Pollution index | 656,658 | 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 | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Hawk Springs, WY | 18 | 19 | 62.0% |
| La Grange, WY | 479 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Altona, CO | 479 | 47 | 6.0% |
| Lisbon, FL | 479 | 38 | 24.0% |
| McCallsburg, IA | 479 | 37 | 26.0% |
| Otho, IA | 479 | 37 | 26.0% |
| Salix, IA | 479 | 35 | 30.0% |
| La Grange, WY | 479 | 19 | 62.0% |
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