| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 60°F | 46°F | 1.8" |
| February | 39°F | 65°F | 50°F | 1.0" |
| March | 47°F | 72°F | 58°F | 1.7" |
| April | 54°F | 79°F | 65°F | 2.6" |
| May | 62°F | 84°F | 72°F | 4.4" |
| June | 70°F | 92°F | 80°F | 3.5" |
| July | 72°F | 95°F | 83°F | 1.6" |
| August | 72°F | 95°F | 83°F | 1.6" |
| September | 66°F | 89°F | 76°F | 1.4" |
| October | 55°F | 80°F | 66°F | 1.9" |
| November | 46°F | 70°F | 56°F | 1.7" |
| December | 37°F | 60°F | 47°F | 1.4" |
| Index | Hico | Texas | National |
| Air quality index | 33 | 52 | 42 |
| Pollution index | 726,578 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Iredell, TX | 392 | 33 | 34.0% |
| Cranfills Gap, TX | 289 | 38 | 24.0% |
| Hico, TX | 1,780 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Johnson City, TX | 1,780 | 44 | 12.0% |
| Level Plains, AL | 1,781 | 35 | 30.0% |
| Delaware City, DE | 1,779 | 42 | 16.0% |
| Zeigler, IL | 1,779 | 43 | 14.0% |
| Lake Dalecarlia, IN | 1,779 | 37 | 26.0% |
| Hico, TX | 1,780 | 33 | 34.0% |
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