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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 4°F | 21°F | 13°F | 1.2" |
| February | 6°F | 25°F | 15°F | 1.0" |
| March | 16°F | 38°F | 26°F | 1.0" |
| April | 27°F | 52°F | 38°F | 2.5" |
| May | 42°F | 69°F | 55°F | 6.0" |
| June | 52°F | 78°F | 64°F | 3.4" |
| July | 56°F | 82°F | 68°F | 4.6" |
| August | 53°F | 81°F | 66°F | 4.4" |
| September | 46°F | 73°F | 58°F | 3.7" |
| October | 33°F | 56°F | 43°F | 3.2" |
| November | 18°F | 40°F | 28°F | 0.8" |
| December | 4°F | 24°F | 14°F | 0.6" |
| Index | Mercer | North Dakota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 4,994,790 | 1,038,665 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 320 |
| Days with moderate air quality | 45 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.040% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Turtle Lake, ND | 473 | 36 | 28.0% |
| Washburn, ND | 1,361 | 36 | 28.0% |
| McClusky, ND | 346 | 36 | 28.0% |
| Mercer, ND | 75 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| False Pass, AK | 75 | 31 | 38.0% |
| Lowndesboro, AL | 75 | 52 | 4.0% |
| Omaha, AR | 75 | 18 | 64.0% |
| Franklin, AZ | 75 | 37 | 26.0% |
| Gold Mountain, CA | 75 | 44 | 12.0% |
| Mercer, ND | 75 | 36 | 28.0% |
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