| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 27°F | 18°F | 2.1" |
| February | 14°F | 32°F | 22°F | 3.7" |
| March | 28°F | 46°F | 35°F | 3.9" |
| April | 38°F | 61°F | 48°F | 4.8" |
| May | 49°F | 72°F | 60°F | 6.4" |
| June | 60°F | 81°F | 70°F | 7.8" |
| July | 63°F | 84°F | 73°F | 7.3" |
| August | 60°F | 81°F | 70°F | 6.7" |
| September | 52°F | 77°F | 63°F | 4.7" |
| October | 40°F | 63°F | 50°F | 7.2" |
| November | 28°F | 48°F | 37°F | 4.5" |
| December | 16°F | 31°F | 23°F | 2.5" |
| Index | Eldora | Iowa | National |
| Air quality index | 37 | 39 | 42 |
| Pollution index | 1,171,930 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 214 |
| Days with good air quality | 210 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.004% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Garden City, IA | 150 | 37 | 26.0% |
| New Providence, IA | 279 | 37 | 26.0% |
| Liscomb, IA | 381 | 37 | 26.0% |
| Hubbard, IA | 771 | 37 | 26.0% |
| Owasa, IA | 16 | 37 | 26.0% |
| Eldora, IA | 2,620 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Dayton, WA | 2,620 | 23 | 54.0% |
| Homestead Valley, CA | 2,619 | 89 | 78.0% |
| Rose Hills, CA | 2,619 | 72 | 44.0% |
| Clarkson Valley, MO | 2,619 | 54 | 8.0% |
| Indian Springs Village, AL | 2,618 | 53 | 6.0% |
| Eldora, IA | 2,620 | 37 | 26.0% |
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