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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 | Turtle Lake | North Dakota | National | 
| Air quality index | 36 | 35 | 42 | 
| Pollution index | 10,956,300 | 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 | 0.390% | 
| Benzene | 0.010% | 
| Carbon Tetrachloride | 0.001% | 
| Lead | 0.100% | 
| Mercury | 0.250% | 
| City | Population | Air Quality Index | National Avg. | 
| Underwood, ND | 768 | 36 | 28.0% | 
| Mercer, ND | 75 | 36 | 28.0% | 
| Turtle Lake, ND | 473 | 36 | 28.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Fort Yukon, AK | 473 | 38 | 24.0% | 
| Courtland, CA | 473 | 52 | 4.0% | 
| Canal Point, FL | 473 | 36 | 28.0% | 
| Thornton, IA | 473 | 15 | 70.0% | 
| Creal Springs, IL | 473 | 44 | 12.0% | 
| Turtle Lake, ND | 473 | 36 | 28.0% |