| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 33°F | 26°F | 2.7" |
| February | 18°F | 34°F | 26°F | 2.5" |
| March | 28°F | 46°F | 36°F | 3.3" |
| April | 39°F | 60°F | 48°F | 3.6" |
| May | 49°F | 70°F | 59°F | 3.8" |
| June | 57°F | 77°F | 66°F | 5.2" |
| July | 61°F | 81°F | 70°F | 4.7" |
| August | 60°F | 79°F | 69°F | 4.2" |
| September | 54°F | 73°F | 63°F | 4.2" |
| October | 44°F | 61°F | 52°F | 4.6" |
| November | 34°F | 50°F | 41°F | 3.1" |
| December | 25°F | 38°F | 31°F | 3.6" |
| Index | Conneaut Lake | Pennsylvania | National |
| Air quality index | 34 | 45 | 42 |
| Pollution index | 3,205,550 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 334 |
| Days with moderate air quality | 23 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.170% |
| Mercury | 0.005% |
| City | Population | Air Quality Index | National Avg. |
| Sheakleyville, PA | 140 | 31 | 38.0% |
| Cochranton, PA | 1,019 | 31 | 38.0% |
| New Lebanon, PA | 202 | 31 | 38.0% |
| Linesville, PA | 1,113 | 34 | 32.0% |
| Conneautville, PA | 764 | 34 | 32.0% |
| Conneaut Lake, PA | 674 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Bergman, AR | 674 | 36 | 28.0% |
| West Goshen, CA | 674 | 66 | 32.0% |
| Alpha, IL | 674 | 46 | 8.0% |
| Brandon, MN | 674 | 29 | 42.0% |
| Holdingford, MN | 674 | 32 | 36.0% |
| Conneaut Lake, PA | 674 | 34 | 32.0% |
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