| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 28°F | 2.2" |
| February | 20°F | 36°F | 28°F | 2.2" |
| March | 30°F | 49°F | 38°F | 2.9" |
| April | 40°F | 62°F | 50°F | 3.3" |
| May | 51°F | 73°F | 62°F | 3.9" |
| June | 60°F | 81°F | 70°F | 4.7" |
| July | 63°F | 84°F | 73°F | 3.8" |
| August | 61°F | 82°F | 71°F | 3.7" |
| September | 55°F | 77°F | 65°F | 3.9" |
| October | 45°F | 65°F | 54°F | 4.2" |
| November | 35°F | 53°F | 43°F | 3.0" |
| December | 27°F | 41°F | 33°F | 3.0" |
| Index | Spencer | Ohio | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 3,864,840 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 278 |
| Days with moderate air quality | 84 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.060% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Bailey Lakes, OH | 309 | 41 | 18.0% |
| Savannah, OH | 320 | 41 | 18.0% |
| Westfield Center, OH | 1,589 | 43 | 14.0% |
| Sterling, OH | 342 | 43 | 14.0% |
| Polk, OH | 402 | 43 | 14.0% |
| Spencer, OH | 684 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Buckland, AK | 684 | 38 | 24.0% |
| Vicksburg, AZ | 684 | 13 | 74.0% |
| Lincoln Park, GA | 684 | 42 | 16.0% |
| Chrisney, IN | 684 | 43 | 14.0% |
| Hendricks, MN | 684 | 42 | 16.0% |
| Spencer, OH | 684 | 43 | 14.0% |
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