| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 53°F | 40°F | 3.1" |
| February | 32°F | 56°F | 43°F | 2.3" |
| March | 42°F | 67°F | 54°F | 5.0" |
| April | 50°F | 76°F | 62°F | 5.1" |
| May | 59°F | 82°F | 70°F | 5.6" |
| June | 68°F | 91°F | 79°F | 3.4" |
| July | 71°F | 94°F | 81°F | 4.1" |
| August | 70°F | 93°F | 81°F | 4.0" |
| September | 62°F | 86°F | 73°F | 3.4" |
| October | 51°F | 76°F | 62°F | 3.7" |
| November | 40°F | 65°F | 51°F | 4.1" |
| December | 33°F | 54°F | 42°F | 4.7" |
| Index | Morrilton | Arkansas | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 410,477 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 235 |
| Days with moderate air quality | 130 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Adona, AR | 198 | 45 | 10.0% |
| Menifee, AR | 195 | 45 | 10.0% |
| Plumerville, AR | 745 | 45 | 10.0% |
| Bigelow, AR | 411 | 45 | 10.0% |
| Oppelo, AR | 832 | 45 | 10.0% |
| Morrilton, AR | 6,638 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Harrisville, UT | 6,637 | 45 | 10.0% |
| Cariboo A, BC | 6,636 | n/a | |
| Litchfield, MN | 6,640 | 32 | 36.0% |
| North Caldwell, NJ | 6,640 | 51 | 2.0% |
| Blackwell, OK | 6,634 | 40 | 20.0% |
| Morrilton, AR | 6,638 | 45 | 10.0% |
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