| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 35°F | 24°F | 0.6" |
| February | 18°F | 41°F | 28°F | 0.7" |
| March | 25°F | 52°F | 38°F | 0.5" |
| April | 31°F | 60°F | 44°F | 0.9" |
| May | 39°F | 69°F | 53°F | 1.8" |
| June | 47°F | 79°F | 63°F | 2.0" |
| July | 55°F | 91°F | 73°F | 0.7" |
| August | 52°F | 88°F | 69°F | 1.1" |
| September | 44°F | 77°F | 59°F | 1.1" |
| October | 34°F | 62°F | 46°F | 0.8" |
| November | 23°F | 47°F | 34°F | 0.8" |
| December | 12°F | 33°F | 22°F | 0.8" |
| Index | Southeast | Helena | Montana |
| Air quality index | 35 | 35 | 34 |
| Pollution index | 1,148,190 | 1,148,190 | 685,925 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 315 |
| Days with moderate air quality | 50 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Helena Valley Northwest, MT | 3,967 | 35 | 30% |
| Jefferson City, MT | 686 | 35 | 30% |
| Spokane Creek, MT | 317 | 35 | 30% |
| Clancy, MT | 1,612 | 35 | 30% |
| Helena Valley Southeast, MT | 7,543 | 35 | 30% |
| Helena, MT | 30,102 | 35 | 30% |
| City, State | Population | Air Quality Index | National Avg. |
| Myrtle Beach, SC | 30,106 | 15 | 70% |
| Orcutt, CA | 30,109 | 56 | 12% |
| Burlingame, CA | 30,118 | 48 | 4% |
| Holly Springs, NC | 30,126 | 43 | 14% |
| Lawrenceville, GA | 30,127 | 42 | 16% |
| Helena, MT | 30,102 | 35 | 30% |