| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 66°F | 54°F | 3.6" |
| February | 46°F | 70°F | 57°F | 2.9" |
| March | 52°F | 76°F | 64°F | 3.6" |
| April | 59°F | 82°F | 70°F | 4.3" |
| May | 66°F | 88°F | 76°F | 5.5" |
| June | 73°F | 94°F | 83°F | 4.6" |
| July | 75°F | 95°F | 84°F | 5.1" |
| August | 75°F | 96°F | 84°F | 7.0" |
| September | 70°F | 92°F | 80°F | 4.2" |
| October | 59°F | 85°F | 71°F | 6.1" |
| November | 51°F | 76°F | 62°F | 3.4" |
| December | 45°F | 67°F | 55°F | 4.1" |
| Index | Hardin | Texas | National |
| Air quality index | 45 | 52 | 42 |
| Pollution index | 99,643 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 234 |
| Days with moderate air quality | 122 |
| Days w/ poor A.Q. for sensitive groups | 8 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Dayton Lakes, TX | 39 | 45 | 10.0% |
| Devers, TX | 385 | 45 | 10.0% |
| Ames, TX | 1,071 | 45 | 10.0% |
| Hull, TX | 642 | 45 | 10.0% |
| Daisetta, TX | 1,045 | 45 | 10.0% |
| Hardin, TX | 712 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Duncan, AZ | 712 | 37 | 26.0% |
| Frankford, DE | 712 | 36 | 28.0% |
| Medaryville, IN | 712 | 37 | 26.0% |
| Littlefork, MN | 712 | 35 | 30.0% |
| Dunkirk, OH | 712 | 39 | 22.0% |
| Hardin, TX | 712 | 45 | 10.0% |
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