| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 51°F | 39°F | 4.8" |
| February | 31°F | 54°F | 42°F | 3.6" |
| March | 39°F | 65°F | 51°F | 4.5" |
| April | 47°F | 75°F | 61°F | 5.5" |
| May | 56°F | 81°F | 68°F | 3.6" |
| June | 65°F | 88°F | 76°F | 3.8" |
| July | 68°F | 90°F | 78°F | 5.6" |
| August | 67°F | 90°F | 78°F | 4.0" |
| September | 61°F | 84°F | 72°F | 4.4" |
| October | 48°F | 74°F | 60°F | 3.4" |
| November | 37°F | 63°F | 49°F | 4.1" |
| December | 32°F | 54°F | 42°F | 6.2" |
| Index | Philadelphia | Tennessee | National |
| Air quality index | 30 | 76 | 42 |
| Pollution index | 7,263,220 | 2,454,916 | 2,726,193 |
| Measurement | Total |
| Days measured | 357 |
| Days with good air quality | 316 |
| Days with moderate air quality | 41 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.240% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.080% |
| Mercury | 0.300% |
| City | Population | Air Quality Index | National Avg. |
| Madisonville, TN | 4,950 | 30 | 40.0% |
| Niota, TN | 837 | 30 | 40.0% |
| Sweetwater, TN | 5,894 | 30 | 40.0% |
| Vonore, TN | 1,931 | 30 | 40.0% |
| Friendsville, TN | 1,050 | 46 | 8.0% |
| Philadelphia, TN | 808 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Hamel, IL | 808 | 54 | 8.0% |
| McLean, IL | 808 | 44 | 12.0% |
| Wheelwright, KY | 808 | 45 | 10.0% |
| Westphalia, MI | 808 | 36 | 28.0% |
| Pleasant Hill, NC | 808 | 45 | 10.0% |
| Philadelphia, TN | 808 | 30 | 40.0% |
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