| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 23°F | 15°F | 0.5" |
| February | 5°F | 25°F | 15°F | 0.1" |
| March | 5°F | 26°F | 16°F | 0.0" |
| April | 28°F | 49°F | 40°F | 0.3" |
| May | 34°F | 57°F | 46°F | 1.4" |
| June | 42°F | 67°F | 56°F | 2.3" |
| July | 46°F | 66°F | 57°F | 2.7" |
| August | 45°F | 61°F | 53°F | 3.9" |
| September | 36°F | 53°F | 44°F | 2.6" |
| October | 31°F | 45°F | 38°F | 3.2" |
| November | 7°F | 21°F | 14°F | 0.4" |
| December | 9°F | 23°F | 16°F | 0.6" |
| Index | Marshall | Alaska | National |
| Air quality index | 31 | 30 | 42 |
| Pollution index | 349,533 | 11,243,194 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 262 |
| Days with moderate air quality | 92 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Marshall, AK | 168 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Sedgwick, AR | 168 | 45 | 10.0% |
| Elgin, AZ | 168 | 45 | 10.0% |
| La Junta Gardens, CO | 168 | 20 | 60.0% |
| Makena, HI | 168 | 15 | 70.0% |
| Smithland, IA | 168 | 35 | 30.0% |
| Marshall, AK | 168 | 31 | 38.0% |
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