| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 35°F | 21°F | 0.4" |
| February | 12°F | 37°F | 23°F | 0.4" |
| March | 21°F | 46°F | 32°F | 0.5" |
| April | 28°F | 57°F | 41°F | 1.4" |
| May | 36°F | 66°F | 51°F | 1.8" |
| June | 44°F | 74°F | 58°F | 3.4" |
| July | 49°F | 84°F | 66°F | 1.0" |
| August | 47°F | 82°F | 63°F | 1.2" |
| September | 40°F | 72°F | 54°F | 1.5" |
| October | 30°F | 59°F | 42°F | 1.4" |
| November | 20°F | 45°F | 30°F | 1.6" |
| December | 7°F | 30°F | 18°F | 0.9" |
| Index | Sunburst | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 217,967 | 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 | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Sweet Grass, MT | 56 | 21 | 58.0% |
| Kevin, MT | 130 | 21 | 58.0% |
| Sunburst, MT | 392 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Mount Pleasant, AR | 392 | 36 | 28.0% |
| Uplands Park, MO | 392 | 54 | 8.0% |
| Ekalaka, MT | 392 | 33 | 34.0% |
| Goldston, NC | 392 | 29 | 42.0% |
| Grimesland, NC | 392 | 0 | 100.0% |
| Sunburst, MT | 392 | 21 | 58.0% |
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