| 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 | Viking | Minnesota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 466,579 | 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 | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| St. Hilaire, MN | 254 | 33 | 34.0% |
| Holt, MN | 82 | 33 | 34.0% |
| Thief River Falls, MN | 8,792 | 33 | 34.0% |
| Middle River, MN | 281 | 33 | 34.0% |
| Newfolden, MN | 410 | 33 | 34.0% |
| Viking, MN | 133 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Aleknagik, AK | 133 | 31 | 38.0% |
| Dutch Flat, CA | 133 | 44 | 12.0% |
| Volta, CA | 133 | 48 | 4.0% |
| Bradgate, IA | 133 | 15 | 70.0% |
| Floris, IA | 133 | 29 | 42.0% |
| Viking, MN | 133 | 33 | 34.0% |
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