| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 50°F | 39°F | 4.9" |
| February | 36°F | 54°F | 43°F | 5.1" |
| March | 48°F | 67°F | 56°F | 9.6" |
| April | 55°F | 77°F | 64°F | 7.8" |
| May | 62°F | 82°F | 71°F | 14.4" |
| June | 69°F | 92°F | 80°F | 2.8" |
| July | 75°F | 96°F | 84°F | 6.0" |
| August | 69°F | 91°F | 79°F | 5.9" |
| September | 60°F | 84°F | 70°F | 7.0" |
| October | 48°F | 74°F | 59°F | 4.6" |
| November | 42°F | 63°F | 51°F | 11.7" |
| December | 37°F | 56°F | 44°F | 10.3" |
| Index | Grubbs | Arkansas | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 485,658 | 1,487,822 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 221 |
| Days with moderate air quality | 139 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.080% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Jacksonport, AR | 198 | 45 | 10.0% |
| Cash, AR | 319 | 45 | 10.0% |
| Weiner, AR | 823 | 45 | 10.0% |
| Newport, AR | 7,552 | 45 | 10.0% |
| Egypt, AR | 40 | 45 | 10.0% |
| Grubbs, AR | 448 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Prattsville, AR | 448 | 45 | 10.0% |
| Andrew, IA | 448 | 42 | 16.0% |
| Badger, IA | 448 | 37 | 26.0% |
| Marquette, IA | 448 | 29 | 42.0% |
| Phelps, KY | 448 | 295 | 490.0% |
| Grubbs, AR | 448 | 45 | 10.0% |
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