| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 40°F | 33°F | 10.7" |
| February | 21°F | 34°F | 28°F | 2.7" |
| March | 31°F | 48°F | 40°F | 6.7" |
| April | 39°F | 59°F | 51°F | 4.2" |
| May | 48°F | 71°F | 62°F | 4.3" |
| June | 59°F | 80°F | 72°F | 7.9" |
| July | 63°F | 82°F | 74°F | 6.2" |
| August | 64°F | 82°F | 75°F | 13.8" |
| September | 56°F | 78°F | 69°F | 6.2" |
| October | 47°F | 66°F | 57°F | 6.5" |
| November | 35°F | 53°F | 44°F | 5.9" |
| December | 27°F | 38°F | 33°F | 2.9" |
| Index | Madison | Pennsylvania | National |
| Air quality index | 56 | 45 | 42 |
| Pollution index | 7,262,690 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 129 |
| Days with moderate air quality | 220 |
| Days w/ poor A.Q. for sensitive groups | 12 |
| Days with unhealthy air quality | 4 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.260% |
| Lead | 0.140% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Everson, PA | 775 | 36 | 28.0% |
| Centerville, PA | 3,159 | 36 | 28.0% |
| West Brownsville, PA | 1,121 | 36 | 28.0% |
| Calumet, PA | 1,415 | 36 | 28.0% |
| Dawson, PA | 467 | 36 | 28.0% |
| Madison, PA | 391 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Twin, AL | 391 | 39 | 22.0% |
| Monterey, IN | 391 | 42 | 16.0% |
| New Troy, MI | 391 | 39 | 22.0% |
| South Mills, NC | 391 | 40 | 20.0% |
| Davenport, NE | 391 | 19 | 62.0% |
| Madison, PA | 391 | 56 | 12.0% |
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