| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 31°F | 24°F | 1.2" |
| February | 16°F | 32°F | 24°F | 2.2" |
| March | 26°F | 44°F | 34°F | 3.0" |
| April | 36°F | 57°F | 46°F | 6.4" |
| May | 47°F | 71°F | 58°F | 4.9" |
| June | 55°F | 78°F | 66°F | 5.3" |
| July | 59°F | 83°F | 71°F | 2.6" |
| August | 58°F | 80°F | 69°F | 6.2" |
| September | 50°F | 73°F | 61°F | 5.2" |
| October | 41°F | 61°F | 50°F | 4.1" |
| November | 31°F | 49°F | 40°F | 2.5" |
| December | 23°F | 35°F | 29°F | 1.6" |
| Index | Sanford | Michigan | National |
| Air quality index | 26 | 69 | 42 |
| Pollution index | 7,127,120 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 316 |
| Days with good air quality | 288 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.160% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.050% |
| Mercury | 0.140% |
| City | Population | Air Quality Index | National Avg. |
| Loomis, MI | 179 | 26 | 48.0% |
| Beaverton, MI | 1,270 | 26 | 48.0% |
| Midland, MI | 41,922 | 26 | 48.0% |
| Coleman, MI | 1,235 | 26 | 48.0% |
| Freeland, MI | 6,866 | 26 | 48.0% |
| Sanford, MI | 862 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Mosses, AL | 862 | 52 | 4.0% |
| Hermitage, AR | 862 | 35 | 30.0% |
| Jupiter Island, FL | 862 | 36 | 28.0% |
| Alexis, IL | 862 | 46 | 8.0% |
| Bloomfield, NE | 862 | 35 | 30.0% |
| Sanford, MI | 862 | 26 | 48.0% |
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