| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 57°F | 45°F | 8.2" |
| February | 39°F | 60°F | 48°F | 6.0" |
| March | 46°F | 69°F | 57°F | 8.6" |
| April | 55°F | 78°F | 65°F | 9.5" |
| May | 61°F | 83°F | 71°F | 7.5" |
| June | 70°F | 91°F | 80°F | 7.6" |
| July | 73°F | 93°F | 82°F | 6.7" |
| August | 72°F | 93°F | 81°F | 7.3" |
| September | 65°F | 89°F | 76°F | 3.5" |
| October | 54°F | 79°F | 65°F | 7.4" |
| November | 44°F | 66°F | 54°F | 6.8" |
| December | 39°F | 58°F | 47°F | 7.8" |
| Index | Tillar | Arkansas | National |
| Air quality index | 43 | 38 | 42 |
| Pollution index | 2,498,240 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 270 |
| Days with moderate air quality | 94 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Dermott, AR | 2,902 | 43 | 14.0% |
| Reed, AR | 121 | 43 | 14.0% |
| Dumas, AR | 3,967 | 43 | 14.0% |
| Watson, AR | 212 | 43 | 14.0% |
| McGehee, AR | 3,835 | 43 | 14.0% |
| Tillar, AR | 228 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Newtok, AK | 228 | 31 | 38.0% |
| Elbert, CO | 228 | 45 | 10.0% |
| Mineola, IA | 228 | 40 | 20.0% |
| Wadena, IA | 228 | 39 | 22.0% |
| Acequia, ID | 228 | 20 | 60.0% |
| Tillar, AR | 228 | 43 | 14.0% |