Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | -3°F | 16°F | 6°F | 19.8" |
February | -2°F | 18°F | 7°F | 6.0" |
March | 14°F | 33°F | 23°F | 3.3" |
April | 30°F | 53°F | 40°F | 1.1" |
May | 41°F | 67°F | 53°F | 3.3" |
June | 52°F | 76°F | 63°F | 4.2" |
July | 56°F | 81°F | 68°F | 2.7" |
August | 53°F | 80°F | 66°F | 2.2" |
September | 46°F | 73°F | 58°F | 2.6" |
October | 34°F | 56°F | 44°F | 1.9" |
November | 19°F | 37°F | 27°F | 1.3" |
December | 2°F | 19°F | 10°F | 9.7" |
Index | St. Thomas | North Dakota | National |
Air quality index | 33 | 35 | 42 |
Pollution index | 536,122 | 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 | 0.010% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.001% |
Lead | 0.020% |
Mercury | 0.004% |
City | Population | Air Quality Index | National Avg. |
Hoople, ND | 265 | 33 | 34.0% |
Grafton, ND | 4,139 | 33 | 34.0% |
Canton City, ND | 19 | 33 | 34.0% |
Drayton, ND | 803 | 33 | 34.0% |
Hamilton, ND | 58 | 33 | 34.0% |
St. Thomas, ND | 340 | 33 | 34.0% |
City | Population | Air Quality Index | National Avg. |
St. Michael, AK | 340 | 31 | 38.0% |
Cazadero, CA | 340 | 34 | 32.0% |
Chilcoot-Vinton, CA | 340 | 46 | 8.0% |
St. Marks, FL | 340 | 40 | 20.0% |
Ryan, IA | 340 | 39 | 22.0% |
St. Thomas, ND | 340 | 33 | 34.0% |