| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 63°F | 50°F | 1.3" |
| February | 44°F | 67°F | 54°F | 1.4" |
| March | 51°F | 74°F | 61°F | 2.9" |
| April | 58°F | 80°F | 68°F | 3.4" |
| May | 65°F | 86°F | 75°F | 5.8" |
| June | 72°F | 93°F | 81°F | 2.2" |
| July | 74°F | 95°F | 83°F | 2.0" |
| August | 74°F | 97°F | 84°F | 4.7" |
| September | 68°F | 90°F | 78°F | 3.2" |
| October | 59°F | 83°F | 69°F | 2.9" |
| November | 50°F | 73°F | 60°F | 2.3" |
| December | 43°F | 64°F | 52°F | 2.3" |
| Index | Giddings | 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. |
| Smithville, TX | 4,501 | 44 | 12.0% |
| Carmine, TX | 204 | 44 | 12.0% |
| Round Top, TX | 81 | 44 | 12.0% |
| Giddings, TX | 5,095 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake Barrington, IL | 5,094 | 55 | 10.0% |
| Juan de Fuca (Part 1), BC | 5,096 | n/a | |
| Richelieu, QC | 5,097 | n/a | |
| Genoa, IL | 5,092 | 42 | 16.0% |
| South Brooksville, FL | 5,098 | 30 | 40.0% |
| Giddings, TX | 5,095 | 44 | 12.0% |
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