| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 39°F | 32°F | 4.5" |
| February | 23°F | 36°F | 28°F | 2.0" |
| March | 32°F | 48°F | 39°F | 3.0" |
| April | 42°F | 59°F | 49°F | 5.0" |
| May | 53°F | 71°F | 61°F | 2.2" |
| June | 67°F | 85°F | 75°F | 2.8" |
| July | 68°F | 84°F | 75°F | 7.6" |
| August | 69°F | 84°F | 76°F | 14.0" |
| September | 62°F | 78°F | 69°F | 5.5" |
| October | 53°F | 67°F | 60°F | 5.3" |
| November | 37°F | 53°F | 45°F | 3.6" |
| December | 27°F | 37°F | 32°F | 3.1" |
| Index | Northfield | Ohio | National |
| Air quality index | 50 | 40 | 42 |
| Pollution index | 28,421,300 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 185 |
| Days with moderate air quality | 173 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.220% |
| Benzene | 0.280% |
| Carbon Tetrachloride | 0.170% |
| Lead | 0.250% |
| Mercury | 0.090% |
| City | Population | Air Quality Index | National Avg. |
| Peninsula, OH | 654 | 43 | 14.0% |
| Fairlawn, OH | 7,536 | 43 | 14.0% |
| Montrose-Ghent, OH | 5,677 | 43 | 14.0% |
| Sugar Bush Knolls, OH | 343 | 43 | 14.0% |
| Richfield, OH | 3,767 | 43 | 14.0% |
| Northfield, OH | 3,667 | 50 | = 100 |
| City | Population | Air Quality Index | National Avg. |
| Mulmur, ON | 3,667 | n/a | |
| Sweeny, TX | 3,666 | 52 | 4.0% |
| Ocilla, GA | 3,668 | 26 | 48.0% |
| Sidney, NY | 3,668 | 27 | 46.0% |
| Sunshine Coast D, BC | 3,668 | n/a | |
| Northfield, OH | 3,667 | 50 | = 100 |
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