| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 24°F | 16°F | 1.2" |
| February | 11°F | 28°F | 18°F | 2.3" |
| March | 27°F | 44°F | 34°F | 2.2" |
| April | 39°F | 59°F | 47°F | 2.9" |
| May | 50°F | 71°F | 59°F | 4.0" |
| June | 60°F | 80°F | 69°F | 5.5" |
| July | 64°F | 83°F | 73°F | 6.8" |
| August | 61°F | 80°F | 70°F | 6.7" |
| September | 53°F | 74°F | 63°F | 4.4" |
| October | 41°F | 60°F | 49°F | 3.0" |
| November | 28°F | 45°F | 36°F | 2.0" |
| December | 13°F | 28°F | 20°F | 1.4" |
| Index | Good Thunder | Minnesota | National |
| Air quality index | 15 | 35 | 42 |
| Pollution index | 2,548,510 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 118 |
| Days with good air quality | 118 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.330% |
| Mercury | 0.490% |
| City | Population | Air Quality Index | National Avg. |
| Vernon Center, MN | 364 | 15 | 70.0% |
| Amboy, MN | 627 | 15 | 70.0% |
| Minnesota Lake, MN | 596 | 15 | 70.0% |
| Mapleton, MN | 1,650 | 15 | 70.0% |
| Pemberton, MN | 265 | 36 | 28.0% |
| Good Thunder, MN | 569 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| South Bethany, DE | 569 | 36 | 28.0% |
| Smelterville, ID | 569 | 43 | 14.0% |
| Dearborn, MO | 569 | 43 | 14.0% |
| Clara, MS | 569 | 35 | 30.0% |
| Schenevus, NY | 569 | 27 | 46.0% |
| Good Thunder, MN | 569 | 15 | 70.0% |