Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 3°F | 27°F | 14°F | 0.5" |
February | 5°F | 29°F | 16°F | 0.6" |
March | 17°F | 45°F | 30°F | 0.7" |
April | 29°F | 60°F | 43°F | 1.1" |
May | 39°F | 70°F | 54°F | 2.7" |
June | 49°F | 80°F | 64°F | 2.6" |
July | 56°F | 89°F | 72°F | 2.1" |
August | 53°F | 87°F | 69°F | 1.5" |
September | 43°F | 77°F | 59°F | 1.6" |
October | 31°F | 60°F | 44°F | 1.2" |
November | 18°F | 43°F | 29°F | 0.7" |
December | 4°F | 27°F | 15°F | 0.8" |
Index | Williston | North Dakota | National |
Air quality index | 34 | 35 | 42 |
Pollution index | 563,599 | 1,038,665 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 309 |
Days with moderate air quality | 53 |
Days w/ poor A.Q. for sensitive groups | 3 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.000% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.001% |
Lead | 0.010% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Springbrook, ND | 14 | 34 | 32.0% |
Epping, ND | 79 | 34 | 32.0% |
Williston, ND | 27,812 | 34 | 32.0% |
City | Population | Air Quality Index | National Avg. |
Boisbriand, QC | 27,813 | n/a | |
Reisterstown, MD | 27,804 | 46 | 8.0% |
Fridley, MN | 27,789 | 46 | 8.0% |
Old Bridge, NJ | 27,836 | 41 | 18.0% |
Slidell, LA | 27,782 | 45 | 10.0% |
Williston, ND | 27,812 | 34 | 32.0% |