| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 29°F | 19°F | 1.4" |
| February | 12°F | 32°F | 22°F | 1.9" |
| March | 25°F | 47°F | 36°F | 2.3" |
| April | 36°F | 62°F | 49°F | 4.9" |
| May | 47°F | 72°F | 59°F | 4.5" |
| June | 58°F | 81°F | 69°F | 5.3" |
| July | 61°F | 84°F | 72°F | 6.9" |
| August | 59°F | 81°F | 70°F | 4.2" |
| September | 51°F | 76°F | 63°F | 3.2" |
| October | 40°F | 63°F | 51°F | 3.4" |
| November | 28°F | 49°F | 38°F | 2.2" |
| December | 15°F | 33°F | 24°F | 2.5" |
| Index | Earlville | Iowa | National |
| Air quality index | 39 | 39 | 50 |
| Pollution index | 586,175 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 287 |
| Days with moderate air quality | 78 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.090% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Holy Cross, IA | 339 | 29 | 42% |
| New Vienna, IA | 381 | 29 | 42% |
| Luxemburg, IA | 203 | 29 | 42% |
| Greeley, IA | 279 | 29 | 42% |
| Colesburg, IA | 462 | 29 | 42% |
| Earlville, IA | 835 | 39 | 22% |
| City, State | Population | Air Quality Index | National Avg. |
| Potlatch, ID | 835 | 10 | 80% |
| Bucklin, KS | 835 | 15 | 70% |
| Angel Fire, NM | 835 | 15 | 70% |
| Lenox, GA | 835 | 35 | 30% |
| Blanchardville, WI | 835 | 39 | 22% |
| Earlville, IA | 835 | 39 | 22% |
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