| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 45°F | 33°F | 4.5" |
| February | 26°F | 47°F | 35°F | 4.8" |
| March | 38°F | 60°F | 47°F | 6.6" |
| April | 47°F | 70°F | 57°F | 9.3" |
| May | 55°F | 77°F | 65°F | 8.8" |
| June | 65°F | 86°F | 74°F | 9.9" |
| July | 68°F | 89°F | 78°F | 9.6" |
| August | 66°F | 88°F | 76°F | 10.9" |
| September | 58°F | 80°F | 68°F | 8.0" |
| October | 47°F | 69°F | 57°F | 7.5" |
| November | 38°F | 59°F | 47°F | 6.5" |
| December | 28°F | 46°F | 36°F | 3.6" |
| Index | Montreal | Missouri | National |
| Air quality index | 39 | 97 | 42 |
| Pollution index | 803,186 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 238 |
| Days with moderate air quality | 7 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brumley, MO | 100 | 39 | 22.0% |
| Richland, MO | 2,388 | 39 | 22.0% |
| Camdenton, MO | 4,084 | 39 | 22.0% |
| Osage Beach, MO | 4,923 | 39 | 22.0% |
| Linn Creek, MO | 297 | 39 | 22.0% |
| Montreal, MO | 208 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Watson, AR | 208 | 43 | 14.0% |
| Garden City, CO | 208 | 45 | 10.0% |
| Campbellton, FL | 208 | 35 | 30.0% |
| Chesterfield, IL | 208 | 40 | 20.0% |
| Hardtner, KS | 208 | 40 | 20.0% |
| Montreal, MO | 208 | 39 | 22.0% |
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