| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 5°F | 23°F | 13°F | 0.6" |
| February | 7°F | 27°F | 16°F | 0.8" |
| March | 21°F | 42°F | 31°F | 1.5" |
| April | 34°F | 57°F | 45°F | 2.7" |
| May | 45°F | 70°F | 57°F | 4.1" |
| June | 56°F | 79°F | 67°F | 4.3" |
| July | 60°F | 85°F | 72°F | 3.4" |
| August | 57°F | 81°F | 69°F | 4.9" |
| September | 50°F | 74°F | 61°F | 3.5" |
| October | 38°F | 58°F | 47°F | 3.4" |
| November | 24°F | 43°F | 33°F | 1.2" |
| December | 10°F | 26°F | 18°F | 1.3" |
| Index | Princeton | Minnesota | National |
| Air quality index | 32 | 35 | 42 |
| Pollution index | 2,322,880 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 344 |
| Days with good air quality | 313 |
| Days with moderate air quality | 31 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.360% |
| Mercury | 0.290% |
| City | Population | Air Quality Index | National Avg. |
| Ronneby, MN | 45 | 32 | 36.0% |
| Milaca, MN | 2,894 | 32 | 36.0% |
| Bock, MN | 90 | 32 | 36.0% |
| Pease, MN | 199 | 32 | 36.0% |
| Zimmerman, MN | 5,831 | 32 | 36.0% |
| Princeton, MN | 4,701 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Gibson, AR | 4,701 | 45 | 10.0% |
| Samoset, FL | 4,701 | 38 | 24.0% |
| Auburn, IL | 4,701 | 40 | 20.0% |
| Christiana, TN | 4,701 | 31 | 38.0% |
| Lower Grand Lagoon, FL | 4,700 | 38 | 24.0% |
| Princeton, MN | 4,701 | 32 | 36.0% |
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