| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 53°F | 44°F | 9.4" |
| February | 38°F | 56°F | 45°F | 3.6" |
| March | 48°F | 70°F | 56°F | 5.2" |
| April | 52°F | 74°F | 61°F | 6.9" |
| May | 63°F | 84°F | 72°F | 4.2" |
| June | 71°F | 91°F | 80°F | 3.0" |
| July | 72°F | 90°F | 79°F | 7.8" |
| August | 74°F | 96°F | 84°F | 6.3" |
| September | 67°F | 88°F | 76°F | 11.9" |
| October | 55°F | 76°F | 64°F | 17.9" |
| November | 46°F | 68°F | 55°F | 5.5" |
| December | 36°F | 56°F | 44°F | 9.2" |
| Index | Ulm | Arkansas | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 1,391,300 | 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 | 0.000% |
| Lead | 0.050% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Holly Grove, AR | 536 | 43 | 14.0% |
| Clarendon, AR | 1,470 | 45 | 10.0% |
| Humphrey, AR | 353 | 45 | 10.0% |
| De Valls Bluff, AR | 602 | 45 | 10.0% |
| Stuttgart, AR | 8,617 | 45 | 10.0% |
| Ulm, AR | 237 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Teller, AK | 237 | 38 | 24.0% |
| Melvin, IA | 237 | 36 | 28.0% |
| McNabb, IL | 237 | 0 | 100.0% |
| Menominee, IL | 237 | 29 | 42.0% |
| Omaha, IL | 237 | 45 | 10.0% |
| Ulm, AR | 237 | 45 | 10.0% |
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