| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 48°F | 36°F | 5.0" |
| February | 31°F | 51°F | 40°F | 4.3" |
| March | 41°F | 63°F | 51°F | 7.8" |
| April | 49°F | 71°F | 59°F | 10.1" |
| May | 57°F | 77°F | 66°F | 11.1" |
| June | 67°F | 87°F | 76°F | 7.7" |
| July | 70°F | 90°F | 79°F | 12.2" |
| August | 69°F | 90°F | 78°F | 8.6" |
| September | 61°F | 82°F | 70°F | 9.8" |
| October | 50°F | 71°F | 59°F | 9.1" |
| November | 40°F | 61°F | 49°F | 7.8" |
| December | 31°F | 50°F | 39°F | 5.8" |
| Index | Lanagan | Missouri | National |
| Air quality index | 38 | 97 | 42 |
| Pollution index | 2,124,190 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 289 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.200% |
| City | Population | Air Quality Index | National Avg. |
| Stella, MO | 286 | 37 | 26.0% |
| Goodman, MO | 1,454 | 37 | 26.0% |
| Ginger Blue, MO | 122 | 38 | 24.0% |
| Southwest City, MO | 1,064 | 38 | 24.0% |
| Cayuga, OK | 152 | 38 | 24.0% |
| Lanagan, MO | 458 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Crawford, CO | 458 | 44 | 12.0% |
| Delhi, IA | 458 | 39 | 22.0% |
| Little Rock, IA | 458 | 36 | 28.0% |
| New Richmond, IN | 458 | 42 | 16.0% |
| Clayton, LA | 458 | 30 | 40.0% |
| Lanagan, MO | 458 | 38 | 24.0% |
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