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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 29°F | 19°F | 0.5" |
| February | 11°F | 32°F | 20°F | 0.4" |
| March | 23°F | 48°F | 33°F | 1.5" |
| April | 32°F | 58°F | 44°F | 2.8" |
| May | 42°F | 68°F | 54°F | 7.0" |
| June | 52°F | 79°F | 65°F | 3.1" |
| July | 59°F | 89°F | 73°F | 4.0" |
| August | 56°F | 86°F | 70°F | 3.9" |
| September | 46°F | 76°F | 60°F | 3.8" |
| October | 34°F | 59°F | 45°F | 2.8" |
| November | 21°F | 44°F | 31°F | 0.6" |
| December | 9°F | 29°F | 18°F | 0.6" |
| Index | Circle | Montana | National |
| Air quality index | 34 | 34 | 42 |
| Pollution index | 192,968 | 834,473 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 309 |
| Days with moderate air quality | 53 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Circle, MT | 511 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Portia, AR | 511 | 45 | 10.0% |
| Rough and Ready, CA | 511 | 44 | 12.0% |
| Juliaetta, ID | 511 | 10 | 80.0% |
| Mackay, ID | 511 | 27 | 46.0% |
| South Range, MI | 511 | 8 | 84.0% |
| Circle, MT | 511 | 34 | 32.0% |
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