| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 37°F | 27°F | 2.0" |
| February | 18°F | 40°F | 28°F | 0.9" |
| March | 25°F | 50°F | 37°F | 1.3" |
| April | 30°F | 56°F | 42°F | 1.9" |
| May | 38°F | 65°F | 51°F | 2.9" |
| June | 46°F | 75°F | 61°F | 3.5" |
| July | 53°F | 85°F | 69°F | 2.7" |
| August | 51°F | 83°F | 66°F | 4.0" |
| September | 45°F | 72°F | 58°F | 6.0" |
| October | 35°F | 60°F | 46°F | 2.0" |
| November | 25°F | 47°F | 35°F | 1.8" |
| December | 14°F | 35°F | 25°F | 1.3" |
| Index | Geyser | Montana | National |
| Air quality index | 21 | 34 | 42 |
| Pollution index | 133,005 | 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 | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Stanford, MT | 260 | 21 | 58.0% |
| Geyser, MT | 78 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Sleetmute, AK | 78 | 31 | 38.0% |
| Palo Verde, CA | 78 | 45 | 10.0% |
| Glendale CDP, CO | 78 | 58 | 16.0% |
| Emison, IN | 78 | 36 | 28.0% |
| Liberty, KS | 78 | 38 | 24.0% |
| Geyser, MT | 78 | 21 | 58.0% |
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