| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 27°F | 19°F | 8.6" |
| February | 19°F | 38°F | 28°F | 6.6" |
| March | 27°F | 48°F | 37°F | 4.2" |
| April | 32°F | 58°F | 45°F | 0.7" |
| May | 39°F | 67°F | 53°F | 2.1" |
| June | 46°F | 75°F | 60°F | 1.3" |
| July | 52°F | 84°F | 68°F | 2.2" |
| August | 50°F | 83°F | 66°F | 1.1" |
| September | 41°F | 69°F | 54°F | 3.6" |
| October | 33°F | 56°F | 43°F | 1.8" |
| November | 22°F | 39°F | 30°F | 2.4" |
| December | 12°F | 25°F | 19°F | 14.8" |
| Index | Rexford | Montana | National |
| Air quality index | 37 | 34 | 42 |
| Pollution index | 968,253 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 302 |
| Days with moderate air quality | 62 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Midvale, MT | 440 | 37 | 26.0% |
| Eureka, MT | 1,517 | 37 | 26.0% |
| Trego, MT | 855 | 37 | 26.0% |
| Fortine, MT | 435 | 37 | 26.0% |
| West Kootenai, MT | 84 | 37 | 26.0% |
| Rexford, MT | 58 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Ventana, AZ | 58 | 74 | 48.0% |
| Carrick, CA | 58 | 42 | 16.0% |
| Jeisyville, IL | 58 | 40 | 20.0% |
| Bethany, IN | 58 | 54 | 8.0% |
| Soldier, KS | 58 | 41 | 18.0% |
| Rexford, MT | 58 | 37 | 26.0% |
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