| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -2°F | 18°F | 7°F | 0.9" |
| February | 1°F | 19°F | 9°F | 0.1" |
| March | 18°F | 37°F | 26°F | 3.0" |
| April | 32°F | 57°F | 43°F | 3.1" |
| May | 45°F | 65°F | 53°F | 5.6" |
| June | 58°F | 76°F | 66°F | 8.5" |
| July | 61°F | 83°F | 71°F | 8.4" |
| August | 56°F | 78°F | 65°F | 2.9" |
| September | 49°F | 73°F | 59°F | 2.1" |
| October | 38°F | 57°F | 46°F | 1.5" |
| November | 23°F | 38°F | 29°F | 2.1" |
| December | 6°F | 22°F | 14°F | 1.2" |
| Index | McHenry | North Dakota | National |
| Air quality index | 33 | 35 | 42 |
| Pollution index | 164,192 | 1,038,665 | 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 | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Binford, ND | 169 | 33 | 34.0% |
| Pekin, ND | 80 | 33 | 34.0% |
| Glenfield, ND | 103 | 33 | 34.0% |
| Sutton, ND | 19 | 33 | 34.0% |
| Grace City, ND | 89 | 33 | 34.0% |
| McHenry, ND | 38 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Central, AK | 38 | 38 | 24.0% |
| Whelen Springs, AR | 38 | 32 | 36.0% |
| McClenney Tract, CA | 38 | 67 | 34.0% |
| Valley Ranch, CA | 38 | 44 | 12.0% |
| Sawpit, CO | 38 | 44 | 12.0% |
| McHenry, ND | 38 | 33 | 34.0% |
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