| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 24°F | 15°F | 0.5" |
| February | 9°F | 28°F | 17°F | 1.8" |
| March | 24°F | 42°F | 32°F | 1.2" |
| April | 35°F | 58°F | 45°F | 1.5" |
| May | 47°F | 72°F | 58°F | 3.4" |
| June | 58°F | 80°F | 68°F | 3.2" |
| July | 62°F | 84°F | 72°F | 2.1" |
| August | 59°F | 81°F | 69°F | 3.1" |
| September | 51°F | 75°F | 62°F | 2.2" |
| October | 39°F | 60°F | 48°F | 2.0" |
| November | 25°F | 45°F | 34°F | 0.9" |
| December | 11°F | 27°F | 19°F | 0.7" |
| Index | Boyd | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 616,877 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 327 |
| Days with moderate air quality | 35 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Montevideo, MN | 5,071 | 32 | 36.0% |
| Porter, MN | 160 | 32 | 36.0% |
| Watson, MN | 178 | 32 | 36.0% |
| St. Leo, MN | 161 | 32 | 36.0% |
| Clarkfield, MN | 962 | 32 | 36.0% |
| Boyd, MN | 149 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Calvert, AL | 149 | 42 | 16.0% |
| Rudy, AR | 149 | 36 | 28.0% |
| Blairsburg, IA | 149 | 37 | 26.0% |
| Calhoun, IL | 149 | 36 | 28.0% |
| Littleton, IL | 149 | 41 | 18.0% |
| Boyd, MN | 149 | 32 | 36.0% |
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