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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 29°F | 20°F | 1.9" |
| February | 16°F | 32°F | 24°F | 2.2" |
| March | 30°F | 51°F | 39°F | 4.5" |
| April | 40°F | 63°F | 51°F | 9.1" |
| May | 51°F | 74°F | 62°F | 9.6" |
| June | 62°F | 83°F | 72°F | 7.8" |
| July | 63°F | 86°F | 74°F | 6.7" |
| August | 63°F | 83°F | 72°F | 8.6" |
| September | 54°F | 79°F | 66°F | 5.4" |
| October | 44°F | 66°F | 54°F | 6.3" |
| November | 29°F | 50°F | 38°F | 3.0" |
| December | 13°F | 27°F | 21°F | 2.4" |
| Index | Randall | 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. |
| Stanhope, IA | 492 | 37 | 26.0% |
| Roland, IA | 1,374 | 37 | 26.0% |
| McCallsburg, IA | 479 | 37 | 26.0% |
| Ames, IA | 66,361 | 37 | 26.0% |
| Ellsworth, IA | 482 | 37 | 26.0% |
| Randall, IA | 154 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Alicia, AR | 154 | 45 | 10.0% |
| Crystal Beach, AZ | 154 | 13 | 74.0% |
| Verdi, CA | 154 | 46 | 8.0% |
| Amherst, CO | 154 | 19 | 62.0% |
| Charleston Park, FL | 154 | 36 | 28.0% |
| Randall, IA | 154 | 37 | 26.0% |
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