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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 34°F | 21°F | 0.5" |
| February | 15°F | 40°F | 26°F | 0.7" |
| March | 25°F | 52°F | 38°F | 1.6" |
| April | 31°F | 59°F | 44°F | 2.1" |
| May | 39°F | 67°F | 52°F | 3.4" |
| June | 48°F | 81°F | 65°F | 0.8" |
| July | 56°F | 90°F | 73°F | 0.5" |
| August | 54°F | 87°F | 70°F | 0.6" |
| September | 45°F | 77°F | 61°F | 1.1" |
| October | 34°F | 61°F | 46°F | 1.6" |
| November | 23°F | 49°F | 35°F | 0.6" |
| December | 9°F | 33°F | 21°F | 1.0" |
| Index | Lander | Wyoming | National |
| Air quality index | 45 | 39 | 42 |
| Pollution index | 270,167 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 294 |
| Days with moderate air quality | 69 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ethete, WY | 1,644 | 45 | 10.0% |
| Fort Washakie, WY | 1,732 | 45 | 10.0% |
| Arapahoe, WY | 1,701 | 45 | 10.0% |
| Hudson, WY | 417 | 45 | 10.0% |
| Boulder Flats, WY | 342 | 45 | 10.0% |
| Lander, WY | 7,533 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Baldwin Harbor, NY | 7,530 | 51 | 2.0% |
| Fairlawn, OH | 7,536 | 43 | 14.0% |
| Kenwood, OH | 7,538 | 54 | 8.0% |
| Locust Grove, GA | 7,525 | 52 | 4.0% |
| Palmyra, PA | 7,541 | 42 | 16.0% |
| Lander, WY | 7,533 | 45 | 10.0% |
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