| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 30°F | 21°F | 0.8" |
| February | 15°F | 33°F | 23°F | 2.0" |
| March | 29°F | 48°F | 38°F | 3.9" |
| April | 40°F | 62°F | 50°F | 4.8" |
| May | 50°F | 74°F | 61°F | 6.0" |
| June | 61°F | 83°F | 71°F | 8.3" |
| July | 64°F | 85°F | 74°F | 7.5" |
| August | 61°F | 82°F | 71°F | 5.6" |
| September | 53°F | 77°F | 64°F | 4.9" |
| October | 42°F | 64°F | 52°F | 7.5" |
| November | 31°F | 49°F | 39°F | 5.2" |
| December | 19°F | 34°F | 26°F | 4.0" |
| Index | Walker | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 5,075,380 | 1,154,535 | 2,726,193 |
| 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 | 0.070% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 2.000% |
| Lead | 0.040% |
| Mercury | 0.100% |
| City | Population | Air Quality Index | National Avg. |
| Central City, IA | 1,207 | 39 | 22.0% |
| Robins, IA | 3,510 | 39 | 22.0% |
| Winthrop, IA | 1,025 | 39 | 22.0% |
| Vinton, IA | 5,075 | 39 | 22.0% |
| Coggon, IA | 743 | 39 | 22.0% |
| Walker, IA | 888 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Waverly Hall, GA | 888 | 42 | 16.0% |
| Aplington, IA | 888 | 39 | 22.0% |
| Stephenson, MI | 888 | 36 | 28.0% |
| Schroon Lake, NY | 888 | 36 | 28.0% |
| Mission, OR | 888 | 38 | 24.0% |
| Walker, IA | 888 | 39 | 22.0% |
Here are the best places to live in Iowa
Check out the 10 safest cities in Iowa
See the best places to live in Walker
Check out the 10 most dangerous cities in Iowa