| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 28°F | 20°F | 1.5" |
| February | 14°F | 30°F | 22°F | 2.6" |
| March | 29°F | 50°F | 38°F | 5.4" |
| April | 38°F | 62°F | 50°F | 7.2" |
| May | 51°F | 73°F | 61°F | 8.0" |
| June | 62°F | 83°F | 72°F | 7.9" |
| July | 63°F | 85°F | 74°F | 5.1" |
| August | 62°F | 82°F | 72°F | 6.6" |
| September | 55°F | 79°F | 66°F | 5.4" |
| October | 44°F | 65°F | 54°F | 5.7" |
| November | 28°F | 49°F | 38°F | 2.2" |
| December | 13°F | 26°F | 20°F | 1.8" |
| Index | Lincoln | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 416,114 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 286 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Garwin, IA | 640 | 39 | 22.0% |
| Hudson, IA | 2,409 | 39 | 22.0% |
| Morrison, IA | 145 | 39 | 22.0% |
| Clutier, IA | 176 | 39 | 22.0% |
| Gladbrook, IA | 968 | 39 | 22.0% |
| Lincoln, IA | 126 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Venetie, AK | 126 | 38 | 24.0% |
| Toxey, AL | 126 | 36 | 28.0% |
| Gu Oidak, AZ | 126 | 47 | 6.0% |
| Myers Flat, CA | 126 | 27 | 46.0% |
| Portland, CO | 126 | 44 | 12.0% |
| Lincoln, IA | 126 | 39 | 22.0% |
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