Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 22°F | 38°F | 30°F | 5.3" |
February | 22°F | 41°F | 31°F | 4.5" |
March | 31°F | 52°F | 41°F | 6.9" |
April | 41°F | 65°F | 53°F | 6.5" |
May | 51°F | 74°F | 62°F | 7.6" |
June | 60°F | 82°F | 71°F | 8.8" |
July | 64°F | 87°F | 75°F | 7.6" |
August | 62°F | 83°F | 72°F | 8.9" |
September | 55°F | 77°F | 66°F | 10.8" |
October | 44°F | 66°F | 55°F | 8.6" |
November | 34°F | 54°F | 44°F | 6.0" |
December | 28°F | 43°F | 35°F | 6.6" |
Index | Williamstown | Pennsylvania | National |
Air quality index | 42 | 45 | 42 |
Pollution index | 3,637,020 | 4,584,805 | 2,726,193 |
Measurement | Total |
Days measured | 360 |
Days with good air quality | 278 |
Days with moderate air quality | 78 |
Days w/ poor A.Q. for sensitive groups | 4 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.020% |
Benzene | 0.030% |
Carbon Tetrachloride | 0.004% |
Lead | 0.010% |
Mercury | 0.002% |
City | Population | Air Quality Index | National Avg. |
Tower City, PA | 1,187 | 42 | 16.0% |
Gordon, PA | 969 | 42 | 16.0% |
Mount Carmel, PA | 5,672 | 42 | 16.0% |
Ravine, PA | 670 | 42 | 16.0% |
Gratz, PA | 763 | 42 | 16.0% |
Williamstown, PA | 1,172 | 42 | 16.0% |
City | Population | Air Quality Index | National Avg. |
Jennerstown, PA | 1,172 | 36 | 28.0% |
Saegertown, PA | 1,172 | 36 | 28.0% |
Buchanan, VA | 1,172 | 38 | 24.0% |
Challenge-Brownsville, CA | 1,171 | 44 | 12.0% |
Silverado Resort, CA | 1,171 | 35 | 30.0% |
Williamstown, PA | 1,172 | 42 | 16.0% |