| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 32°F | 24°F | 2.1" |
| February | 16°F | 32°F | 24°F | 1.9" |
| March | 25°F | 43°F | 33°F | 2.5" |
| April | 36°F | 58°F | 46°F | 3.1" |
| May | 46°F | 69°F | 57°F | 3.5" |
| June | 54°F | 75°F | 64°F | 4.2" |
| July | 58°F | 79°F | 68°F | 4.3" |
| August | 56°F | 77°F | 66°F | 3.9" |
| September | 51°F | 71°F | 60°F | 3.5" |
| October | 42°F | 60°F | 50°F | 4.3" |
| November | 32°F | 48°F | 39°F | 2.2" |
| December | 24°F | 37°F | 30°F | 3.1" |
| Index | Sweden Valley | Pennsylvania | National |
| Air quality index | 35 | 45 | 42 |
| Pollution index | 1,515,200 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 357 |
| Days with good air quality | 345 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.050% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Austin, PA | 628 | 35 | 30.0% |
| Shinglehouse, PA | 1,059 | 35 | 30.0% |
| Coudersport, PA | 2,652 | 35 | 30.0% |
| Oswayo, PA | 139 | 35 | 30.0% |
| Roulette, PA | 701 | 35 | 30.0% |
| Sweden Valley, PA | 236 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Koliganek, AK | 236 | 31 | 38.0% |
| Artois, CA | 236 | 46 | 8.0% |
| Tonyville, CA | 236 | 66 | 32.0% |
| Denton, GA | 236 | 26 | 48.0% |
| Winchester, ID | 236 | 29 | 42.0% |
| Sweden Valley, PA | 236 | 35 | 30.0% |
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