| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 54°F | 42°F | 3.6" |
| February | 36°F | 57°F | 45°F | 3.7" |
| March | 45°F | 67°F | 55°F | 5.6" |
| April | 53°F | 76°F | 64°F | 6.5" |
| May | 61°F | 82°F | 71°F | 7.0" |
| June | 71°F | 91°F | 80°F | 3.1" |
| July | 73°F | 93°F | 82°F | 4.4" |
| August | 73°F | 93°F | 82°F | 3.6" |
| September | 66°F | 87°F | 75°F | 3.5" |
| October | 53°F | 76°F | 63°F | 4.3" |
| November | 43°F | 65°F | 53°F | 5.1" |
| December | 36°F | 55°F | 44°F | 6.4" |
| Index | Salem city | Arkansas | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 1,468,480 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Lonsdale, AR | 265 | 38 | 24.0% |
| Traskwood, AR | 350 | 38 | 24.0% |
| Benton, AR | 36,360 | 45 | 10.0% |
| East End, AR | 6,150 | 45 | 10.0% |
| Landmark, AR | 3,628 | 45 | 10.0% |
| Salem city, AR | 1,935 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Decatur, MI | 1,935 | 38 | 24.0% |
| New Songhees 1A, BC | 1,935 | n/a | |
| Avoca, AR | 1,936 | 44 | 12.0% |
| Edmonton, KY | 1,936 | 43 | 14.0% |
| Langdon, ND | 1,936 | 33 | 34.0% |
| Salem city, AR | 1,935 | 45 | 10.0% |
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