| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 64°F | 51°F | 3.7" |
| February | 46°F | 69°F | 56°F | 2.5" |
| March | 53°F | 75°F | 63°F | 3.7" |
| April | 60°F | 82°F | 70°F | 2.5" |
| May | 65°F | 86°F | 75°F | 7.1" |
| June | 73°F | 93°F | 82°F | 3.1" |
| July | 75°F | 96°F | 85°F | 1.9" |
| August | 76°F | 98°F | 86°F | 4.5" |
| September | 71°F | 92°F | 81°F | 3.3" |
| October | 61°F | 84°F | 71°F | 3.4" |
| November | 51°F | 73°F | 61°F | 3.1" |
| December | 45°F | 65°F | 54°F | 3.5" |
| Index | Caldwell | 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. |
| Lake Bryan, TX | 1,299 | 38 | 24.0% |
| Milano, TX | 658 | 42 | 16.0% |
| Snook, TX | 569 | 44 | 12.0% |
| Somerville, TX | 1,254 | 44 | 12.0% |
| Caldwell, TX | 4,445 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| King City, OR | 4,445 | 38 | 24.0% |
| Sheffield, OH | 4,444 | 50 | = 100 |
| Argo, AL | 4,447 | 53 | 6.0% |
| Sparta, IL | 4,447 | 54 | 8.0% |
| East Troy, WI | 4,447 | 37 | 26.0% |
| Caldwell, TX | 4,445 | 44 | 12.0% |
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