| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 63°F | 50°F | 8.8" |
| February | 44°F | 69°F | 55°F | 2.4" |
| March | 50°F | 73°F | 60°F | 7.4" |
| April | 57°F | 81°F | 68°F | 6.4" |
| May | 63°F | 85°F | 73°F | 12.0" |
| June | 72°F | 93°F | 82°F | 5.7" |
| July | 74°F | 96°F | 84°F | 2.8" |
| August | 74°F | 97°F | 85°F | 12.7" |
| September | 70°F | 93°F | 81°F | 6.1" |
| October | 60°F | 84°F | 71°F | 5.6" |
| November | 50°F | 71°F | 59°F | 7.9" |
| December | 43°F | 63°F | 52°F | 6.6" |
| Index | Rockdale | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 692,760 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 249 |
| Days with moderate air quality | 114 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Milano, TX | 637 | 42 | 16.0% |
| Cameron, TX | 5,476 | 42 | 16.0% |
| Thorndale, TX | 1,323 | 44 | 12.0% |
| Rockdale, TX | 5,505 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Beardstown, IL | 5,504 | 40 | 20.0% |
| Batesburg-Leesville, SC | 5,504 | 43 | 14.0% |
| Whiskey Creek, FL | 5,508 | 36 | 28.0% |
| Lac-Mégantic, QC | 5,501 | n/a | |
| Slinger, WI | 5,500 | 44 | 12.0% |
| Rockdale, TX | 5,505 | 44 | 12.0% |
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