| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -2°F | 17°F | 7°F | 0.7" |
| February | 1°F | 18°F | 9°F | 0.3" |
| March | 18°F | 36°F | 25°F | 4.0" |
| April | 33°F | 56°F | 43°F | 3.9" |
| May | 45°F | 67°F | 54°F | 2.1" |
| June | 57°F | 75°F | 65°F | 6.6" |
| July | 59°F | 81°F | 69°F | 5.1" |
| August | 55°F | 78°F | 65°F | 4.7" |
| September | 48°F | 72°F | 58°F | 1.4" |
| October | 39°F | 57°F | 46°F | 5.4" |
| November | 22°F | 37°F | 28°F | 1.4" |
| December | 6°F | 20°F | 13°F | 0.2" |
| Index | Fertile | Minnesota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 467,357 | 1,854,519 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 327 |
| Days with moderate air quality | 34 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Beltrami, MN | 96 | 33 | 34.0% |
| Mahnomen, MN | 1,160 | 33 | 34.0% |
| Bejou, MN | 79 | 33 | 34.0% |
| Mahnomen CDP, MN | 268 | 33 | 34.0% |
| Erskine, MN | 450 | 33 | 34.0% |
| Fertile, MN | 931 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Danville, IA | 931 | 29 | 42.0% |
| Hernandez, NM | 931 | 41 | 18.0% |
| Walnut Grove, TN | 931 | 40 | 20.0% |
| Lot 20, PE | 931 | n/a | |
| Saint-Léon-le-Grand, QC | 931 | n/a | |
| Fertile, MN | 931 | 33 | 34.0% |
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