| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 56°F | 42°F | 2.9" |
| February | 35°F | 59°F | 46°F | 2.2" |
| March | 43°F | 69°F | 55°F | 4.1" |
| April | 50°F | 76°F | 62°F | 5.1" |
| May | 59°F | 82°F | 70°F | 5.4" |
| June | 68°F | 90°F | 79°F | 3.1" |
| July | 70°F | 93°F | 81°F | 3.8" |
| August | 70°F | 94°F | 81°F | 3.0" |
| September | 63°F | 88°F | 74°F | 3.4" |
| October | 50°F | 78°F | 62°F | 3.2" |
| November | 41°F | 67°F | 53°F | 3.0" |
| December | 34°F | 57°F | 44°F | 3.8" |
| Index | Gillham | Arkansas | National |
| Air quality index | 39 | 38 | 42 |
| Pollution index | 6,037,890 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 349 |
| Days with good air quality | 254 |
| Days with moderate air quality | 94 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| 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. |
| Grannis, AR | 546 | 39 | 22.0% |
| Vandervoort, AR | 178 | 39 | 22.0% |
| Lockesburg, AR | 621 | 39 | 22.0% |
| Wickes, AR | 1,133 | 39 | 22.0% |
| Eagletown, OK | 503 | 39 | 22.0% |
| Gillham, AR | 291 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Bass Lake, CA | 291 | 50 | = 100 |
| Holland, IA | 291 | 39 | 22.0% |
| Oakdale, IL | 291 | 43 | 14.0% |
| Millhousen, IN | 291 | 41 | 18.0% |
| Madaket, MA | 291 | 36 | 28.0% |
| Gillham, AR | 291 | 39 | 22.0% |
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