| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 30°F | 22°F | 1.2" |
| February | 16°F | 33°F | 23°F | 3.5" |
| March | 30°F | 48°F | 38°F | 4.0" |
| April | 40°F | 62°F | 50°F | 8.9" |
| May | 51°F | 73°F | 61°F | 8.7" |
| June | 62°F | 82°F | 71°F | 5.2" |
| July | 65°F | 84°F | 74°F | 6.6" |
| August | 63°F | 82°F | 72°F | 8.4" |
| September | 55°F | 77°F | 65°F | 5.0" |
| October | 43°F | 63°F | 52°F | 4.4" |
| November | 32°F | 49°F | 39°F | 7.4" |
| December | 19°F | 34°F | 26°F | 1.7" |
| Index | Madrid | Iowa | National |
| Air quality index | 37 | 39 | 42 |
| Pollution index | 9,310,160 | 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 | 0.010% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.080% |
| Lead | 0.030% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Huxley, IA | 3,912 | 37 | 26.0% |
| Perry, IA | 7,660 | 37 | 26.0% |
| Slater, IA | 1,463 | 37 | 26.0% |
| Boone, IA | 12,470 | 37 | 26.0% |
| Ogden, IA | 1,767 | 37 | 26.0% |
| Madrid, IA | 2,570 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Oakland City, IN | 2,570 | 6 | 88.0% |
| Monticello, UT | 2,570 | 44 | 12.0% |
| Lake View, AL | 2,569 | 35 | 30.0% |
| Dade City North, FL | 2,569 | 36 | 28.0% |
| Horseheads North, NY | 2,569 | 35 | 30.0% |
| Madrid, IA | 2,570 | 37 | 26.0% |
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