| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 52°F | 39°F | 7.0" |
| February | 32°F | 53°F | 41°F | 5.3" |
| March | 43°F | 66°F | 53°F | 3.7" |
| April | 46°F | 71°F | 57°F | 10.1" |
| May | 56°F | 81°F | 68°F | 4.0" |
| June | 66°F | 89°F | 76°F | 13.5" |
| July | 68°F | 91°F | 78°F | 3.7" |
| August | 71°F | 97°F | 82°F | 6.2" |
| September | 63°F | 88°F | 74°F | 8.8" |
| October | 50°F | 75°F | 60°F | 4.6" |
| November | 40°F | 65°F | 51°F | 9.4" |
| December | 31°F | 52°F | 39°F | 6.7" |
| Index | Norfork | Arkansas | National |
| Air quality index | 36 | 38 | 42 |
| Pollution index | 1,734,170 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 347 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Big Flat, AR | 51 | 36 | 28.0% |
| Cotter, AR | 1,123 | 36 | 28.0% |
| Midway town, AR | 380 | 36 | 28.0% |
| Calico Rock, AR | 2,338 | 36 | 28.0% |
| Gassville, AR | 2,515 | 36 | 28.0% |
| Norfork, AR | 572 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Sautee-Nacoochee, GA | 572 | 37 | 26.0% |
| Anthon, IA | 572 | 35 | 30.0% |
| Richland, IA | 572 | 35 | 30.0% |
| Atlanta, MO | 572 | 41 | 18.0% |
| Edgeley, ND | 572 | 20 | 60.0% |
| Norfork, AR | 572 | 36 | 28.0% |
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