| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 40°F | 28°F | 1.3" |
| February | 19°F | 40°F | 29°F | 0.8" |
| March | 27°F | 51°F | 39°F | 1.4" |
| April | 33°F | 58°F | 45°F | 2.9" |
| May | 37°F | 64°F | 51°F | 4.5" |
| June | 46°F | 76°F | 61°F | 4.2" |
| July | 52°F | 86°F | 69°F | 3.1" |
| August | 50°F | 84°F | 67°F | 2.7" |
| September | 44°F | 72°F | 58°F | 5.7" |
| October | 36°F | 62°F | 49°F | 2.3" |
| November | 26°F | 47°F | 37°F | 1.3" |
| December | 16°F | 35°F | 26°F | 1.2" |
| Index | Belt | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 250,374 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 350 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Sand Coulee, MT | 201 | 21 | 58.0% |
| Gibson Flats, MT | 205 | 21 | 58.0% |
| Stockett, MT | 189 | 21 | 58.0% |
| Highwood, MT | 229 | 21 | 58.0% |
| Malmstrom AFB, MT | 3,902 | 21 | 58.0% |
| Belt, MT | 537 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Glennallen, AK | 537 | 31 | 38.0% |
| Napaskiak, AK | 537 | 31 | 38.0% |
| Steinhatchee, FL | 537 | 38 | 24.0% |
| Woodland, MN | 537 | 46 | 8.0% |
| Paxton, NE | 537 | 19 | 62.0% |
| Belt, MT | 537 | 21 | 58.0% |
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