| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -11°F | 59°F | 23°F | n/a |
| February | -8°F | 64°F | 26°F | n/a |
| March | 1°F | 79°F | 41°F | n/a |
| April | 16°F | 90°F | 49°F | n/a |
| May | 36°F | 90°F | 64°F | n/a |
| June | 50°F | 99°F | 72°F | n/a |
| July | 54°F | 97°F | 75°F | n/a |
| August | 50°F | 97°F | 73°F | n/a |
| September | 37°F | 88°F | 65°F | n/a |
| October | 28°F | 86°F | 53°F | 0.3" |
| November | 9°F | 79°F | 43°F | 0.1" |
| December | -6°F | 63°F | 27°F | 0.1" |
| Index | Bartlett | Iowa | National |
| Air quality index | 48 | 39 | 50 |
| Pollution index | 747,023 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 197 |
| Days with moderate air quality | 164 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.050% |
| Mercury | 0.030% |
| City, State | Population | Air Quality Index | National Avg. |
| Dunbar, NE | 191 | 34 | 32% |
| Glenwood, IA | 5,233 | 48 | 4% |
| Randolph, IA | 190 | 48 | 4% |
| Thurman, IA | 191 | 48 | 4% |
| Nebraska City, NE | 7,303 | 48 | 4% |
| Bartlett, IA | 0 | 48 | 4% |
| City, State | Population | Air Quality Index | National Avg. |
| Petersville, AK | 0 | 29 | 42% |
| Myers Flat, CA | 0 | 31 | 38% |
| Southfield, MA | 0 | 47 | 6% |
| Rivers, NM | 0 | 37 | 26% |
| Four Points, TX | 0 | 38 | 24% |
| Bartlett, IA | 0 | 48 | 4% |