| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 54°F | 43°F | 3.8" |
| February | 37°F | 57°F | 46°F | 3.7" |
| March | 45°F | 67°F | 55°F | 5.1" |
| April | 53°F | 76°F | 64°F | 5.7" |
| May | 61°F | 82°F | 71°F | 5.6" |
| June | 70°F | 90°F | 80°F | 2.7" |
| July | 72°F | 92°F | 81°F | 3.3" |
| August | 71°F | 92°F | 81°F | 4.0" |
| September | 64°F | 87°F | 74°F | 3.7" |
| October | 52°F | 77°F | 63°F | 4.3" |
| November | 43°F | 65°F | 53°F | 3.7" |
| December | 37°F | 56°F | 45°F | 5.9" |
| Index | Altheimer | Arkansas | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 308,818 | 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 | 0.005% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Coy, AR | 65 | 45 | 10.0% |
| White Hall, AR | 5,017 | 45 | 10.0% |
| Humnoke, AR | 181 | 45 | 10.0% |
| Allport, AR | 89 | 45 | 10.0% |
| Sherrill, AR | 285 | 45 | 10.0% |
| Altheimer, AR | 772 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Deer Park, CA | 772 | 34 | 32.0% |
| Essex, IA | 772 | 40 | 20.0% |
| Hatfield, IN | 772 | 43 | 14.0% |
| Greensburg, KS | 772 | 15 | 70.0% |
| Tribune, KS | 772 | 15 | 70.0% |
| Altheimer, AR | 772 | 45 | 10.0% |
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