| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 43°F | 32°F | 0.7" |
| February | 26°F | 47°F | 35°F | 1.3" |
| March | 38°F | 60°F | 48°F | 2.2" |
| April | 48°F | 70°F | 58°F | 3.9" |
| May | 57°F | 77°F | 67°F | 5.0" |
| June | 68°F | 88°F | 78°F | 5.6" |
| July | 72°F | 91°F | 81°F | 4.7" |
| August | 70°F | 90°F | 79°F | 5.1" |
| September | 62°F | 82°F | 71°F | 4.3" |
| October | 49°F | 70°F | 59°F | 3.5" |
| November | 38°F | 59°F | 48°F | 1.5" |
| December | 27°F | 45°F | 35°F | 1.2" |
| Index | Merriam | Kansas | National |
| Air quality index | 47 | 47 | 42 |
| Pollution index | 170,963 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 210 |
| Days with moderate air quality | 154 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| De Soto, KS | 6,374 | 47 | 6.0% |
| Lake Quivira, KS | 1,081 | 47 | 6.0% |
| Overland Park, KS | 193,412 | 47 | 6.0% |
| Westwood, KS | 1,746 | 47 | 6.0% |
| North Kansas City, MO | 4,606 | 47 | 6.0% |
| Merriam, KS | 11,191 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Garden City, SC | 11,193 | 14 | 72.0% |
| Scottdale, GA | 11,196 | 52 | 4.0% |
| East Glenville, NY | 11,184 | 37 | 26.0% |
| Kalaoa, HI | 11,198 | 16 | 68.0% |
| Springdale, OH | 11,201 | 54 | 8.0% |
| Merriam, KS | 11,191 | 47 | 6.0% |
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