| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 42°F | 33°F | 6.4" |
| February | 29°F | 49°F | 38°F | 2.5" |
| March | 41°F | 65°F | 51°F | 5.1" |
| April | 46°F | 68°F | 56°F | 2.7" |
| May | 58°F | 79°F | 68°F | 8.3" |
| June | 67°F | 86°F | 76°F | 13.8" |
| July | 68°F | 90°F | 78°F | 9.0" |
| August | 71°F | 93°F | 81°F | 6.8" |
| September | 63°F | 86°F | 73°F | 4.5" |
| October | 51°F | 74°F | 61°F | 5.7" |
| November | 37°F | 63°F | 48°F | 2.4" |
| December | 23°F | 46°F | 33°F | 0.9" |
| Index | Galesburg | Kansas | National |
| Air quality index | 38 | 47 | 42 |
| Pollution index | 404,642 | 989,153 | 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 | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Stark, KS | 67 | 37 | 26.0% |
| Erie, KS | 1,503 | 38 | 24.0% |
| Parsons, KS | 9,648 | 38 | 24.0% |
| Chanute, KS | 9,044 | 38 | 24.0% |
| St. Paul, KS | 543 | 38 | 24.0% |
| Galesburg, KS | 123 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Cold Bay, AK | 123 | 31 | 38.0% |
| Blue Mountain, AR | 123 | 36 | 28.0% |
| Nicasio, CA | 123 | 40 | 20.0% |
| Vincent, IA | 123 | 37 | 26.0% |
| Princeton, ID | 123 | 10 | 80.0% |
| Galesburg, KS | 123 | 38 | 24.0% |
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