| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 55°F | 38°F | 2.3" |
| February | 29°F | 60°F | 42°F | 1.0" |
| March | 37°F | 71°F | 52°F | 4.5" |
| April | 44°F | 77°F | 59°F | 2.1" |
| May | 53°F | 82°F | 66°F | 2.1" |
| June | 63°F | 91°F | 77°F | 3.2" |
| July | 65°F | 91°F | 78°F | 4.8" |
| August | 64°F | 90°F | 77°F | 3.8" |
| September | 57°F | 83°F | 69°F | 4.9" |
| October | 46°F | 75°F | 59°F | 1.3" |
| November | 35°F | 65°F | 48°F | 2.0" |
| December | 27°F | 54°F | 39°F | 2.0" |
| Index | Hart | Texas | National |
| Air quality index | 25 | 52 | 42 |
| Pollution index | 392,874 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 330 |
| Days with good air quality | 316 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Olton, TX | 1,867 | 25 | 50.0% |
| Edmonson, TX | 85 | 25 | 50.0% |
| Springlake, TX | 80 | 25 | 50.0% |
| Dimmitt, TX | 4,106 | 44 | 12.0% |
| Nazareth, TX | 298 | 44 | 12.0% |
| Hart, TX | 1,161 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Limon, CO | 1,161 | 45 | 10.0% |
| St. Martins, MO | 1,161 | 39 | 22.0% |
| Verdi, NV | 1,161 | 46 | 8.0% |
| Linden, TN | 1,161 | 27 | 46.0% |
| Saint-Siméon, QC | 1,161 | n/a | |
| Hart, TX | 1,161 | 25 | 50.0% |
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