| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 36°F | 25°F | 0.9" |
| February | 17°F | 41°F | 29°F | 1.0" |
| March | 24°F | 51°F | 36°F | 1.4" |
| April | 31°F | 59°F | 44°F | 3.5" |
| May | 38°F | 65°F | 52°F | 4.7" |
| June | 45°F | 77°F | 61°F | 3.6" |
| July | 52°F | 88°F | 70°F | 3.9" |
| August | 51°F | 86°F | 68°F | 4.7" |
| September | 43°F | 74°F | 58°F | 3.8" |
| October | 35°F | 61°F | 47°F | 2.7" |
| November | 24°F | 46°F | 35°F | 1.9" |
| December | 14°F | 35°F | 24°F | 1.7" |
| Index | Cascade | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 1,148,190 | 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 | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ulm, MT | 750 | 21 | 58.0% |
| Craig, MT | 16 | 40 | 20.0% |
| Cascade, MT | 648 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Minden, IA | 648 | 40 | 20.0% |
| Rolfe, IA | 648 | 15 | 70.0% |
| Waldron, IN | 648 | 41 | 18.0% |
| Fort Jesup, LA | 648 | 30 | 40.0% |
| Edgerton, MO | 648 | 43 | 14.0% |
| Cascade, MT | 648 | 21 | 58.0% |
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