| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 52°F | 42°F | 11.7" |
| February | 36°F | 57°F | 45°F | 4.6" |
| March | 46°F | 68°F | 56°F | 6.1" |
| April | 48°F | 72°F | 59°F | 6.0" |
| May | 57°F | 80°F | 68°F | 3.5" |
| June | 66°F | 88°F | 76°F | 4.7" |
| July | 68°F | 90°F | 78°F | 5.8" |
| August | 70°F | 96°F | 82°F | 3.5" |
| September | 63°F | 88°F | 75°F | 15.1" |
| October | 51°F | 76°F | 62°F | 5.4" |
| November | 43°F | 65°F | 53°F | 9.2" |
| December | 32°F | 56°F | 42°F | 6.2" |
| Index | Norman | Arkansas | National |
| Air quality index | 38 | 38 | 42 |
| Pollution index | 6,037,890 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 121 |
| Days with good air quality | 93 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 3.210% |
| Lead | 0.160% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Amity, AR | 753 | 32 | 36.0% |
| Kirby, AR | 710 | 32 | 36.0% |
| Oden, AR | 262 | 38 | 24.0% |
| Black Springs, AR | 99 | 38 | 24.0% |
| Glenwood, AR | 1,979 | 38 | 24.0% |
| Norman, AR | 441 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| French Gulch, CA | 441 | 42 | 16.0% |
| Sierra Brooks, CA | 441 | 44 | 12.0% |
| Callender, IA | 441 | 37 | 26.0% |
| Farragut, IA | 441 | 40 | 20.0% |
| Riverdale, IA | 441 | 46 | 8.0% |
| Norman, AR | 441 | 38 | 24.0% |
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