| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 37°F | 28°F | 3.3" |
| February | 20°F | 38°F | 28°F | 3.0" |
| March | 29°F | 49°F | 38°F | 3.2" |
| April | 39°F | 63°F | 51°F | 3.8" |
| May | 50°F | 73°F | 61°F | 3.7" |
| June | 60°F | 82°F | 71°F | 4.5" |
| July | 63°F | 85°F | 74°F | 4.5" |
| August | 62°F | 84°F | 73°F | 4.4" |
| September | 56°F | 77°F | 66°F | 4.2" |
| October | 45°F | 66°F | 55°F | 4.5" |
| November | 35°F | 54°F | 44°F | 3.4" |
| December | 26°F | 41°F | 33°F | 3.5" |
| Index | Valley City | Ohio | National |
| Air quality index | 50 | 40 | 42 |
| Pollution index | 9,912,140 | 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 | 0.120% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.440% |
| Mercury | 0.260% |
| City | Population | Air Quality Index | National Avg. |
| Westfield Center, OH | 1,589 | 43 | 14.0% |
| Richfield, OH | 3,767 | 43 | 14.0% |
| Spencer, OH | 684 | 43 | 14.0% |
| Norton, OH | 11,984 | 43 | 14.0% |
| Gloria Glens Park, OH | 429 | 43 | 14.0% |
| Valley City, OH | 925 | 50 | = 100 |
| City | Population | Air Quality Index | National Avg. |
| Warsaw, MN | 925 | 37 | 26.0% |
| McLeansville, NC | 925 | 43 | 14.0% |
| Laurys Station, PA | 925 | 42 | 16.0% |
| Volente, TX | 925 | 44 | 12.0% |
| Bradford, VT | 925 | 34 | 32.0% |
| Valley City, OH | 925 | 50 | = 100 |
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