| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 29°F | 19°F | 1.3" |
| February | 11°F | 33°F | 22°F | 1.2" |
| March | 25°F | 49°F | 36°F | 1.9" |
| April | 36°F | 63°F | 49°F | 5.0" |
| May | 47°F | 74°F | 60°F | 4.8" |
| June | 58°F | 83°F | 71°F | 6.5" |
| July | 61°F | 86°F | 74°F | 4.9" |
| August | 58°F | 84°F | 71°F | 4.0" |
| September | 51°F | 79°F | 64°F | 3.4" |
| October | 39°F | 65°F | 51°F | 3.2" |
| November | 27°F | 50°F | 38°F | 1.8" |
| December | 14°F | 33°F | 23°F | 2.1" |
| Index | Hudson | Iowa | National |
| Air quality index | 43 | 39 | 50 |
| Pollution index | 416,114 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 240 |
| Days with moderate air quality | 122 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Dike, IA | 1,309 | 43 | 14% |
| Gilbertville, IA | 723 | 43 | 14% |
| Morrison, IA | 122 | 43 | 14% |
| Stout, IA | 162 | 43 | 14% |
| Dunkerton, IA | 895 | 43 | 14% |
| Hudson, IA | 2,414 | 43 | 14% |
| City, State | Population | Air Quality Index | National Avg. |
| Manahawkin, NJ | 2,415 | 36 | 28% |
| Granville, NY | 2,413 | 34 | 32% |
| Egypt, PA | 2,413 | 47 | 6% |
| Lebanon South, PA | 2,413 | 43 | 14% |
| Jefferson, TX | 2,416 | 39 | 22% |
| Hudson, IA | 2,414 | 43 | 14% |