| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 48°F | 35°F | 0.6" |
| February | 27°F | 51°F | 38°F | 1.3" |
| March | 39°F | 64°F | 50°F | 2.6" |
| April | 47°F | 72°F | 59°F | 3.7" |
| May | 56°F | 79°F | 67°F | 5.0" |
| June | 67°F | 90°F | 78°F | 6.0" |
| July | 71°F | 94°F | 82°F | 4.2" |
| August | 69°F | 92°F | 80°F | 4.5" |
| September | 61°F | 85°F | 72°F | 2.5" |
| October | 49°F | 74°F | 60°F | 2.8" |
| November | 37°F | 61°F | 48°F | 1.6" |
| December | 26°F | 48°F | 36°F | 1.4" |
| Index | Caldwell | Kansas | National |
| Air quality index | 40 | 47 | 42 |
| Pollution index | 222,900 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 292 |
| Days with moderate air quality | 72 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Freeport, KS | 0 | 40 | 20.0% |
| Renfrow, OK | 5 | 40 | 20.0% |
| Bluff City, KS | 69 | 40 | 20.0% |
| South Haven, KS | 390 | 40 | 20.0% |
| Hunnewell, KS | 71 | 40 | 20.0% |
| Caldwell, KS | 971 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Utica, IN | 971 | 49 | 2.0% |
| Dollar Bay, MI | 971 | 8 | 84.0% |
| Poplar, MT | 971 | 34 | 32.0% |
| Pleasantville, OH | 971 | 46 | 8.0% |
| New Philadelphia, PA | 971 | 42 | 16.0% |
| Caldwell, KS | 971 | 40 | 20.0% |
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