| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 59°F | 46°F | 9.1" |
| February | 40°F | 63°F | 50°F | 4.6" |
| March | 46°F | 69°F | 57°F | 11.5" |
| April | 53°F | 78°F | 65°F | 12.5" |
| May | 61°F | 82°F | 70°F | 12.5" |
| June | 70°F | 89°F | 78°F | 5.7" |
| July | 72°F | 93°F | 82°F | 4.4" |
| August | 72°F | 93°F | 81°F | 7.6" |
| September | 67°F | 91°F | 78°F | 3.7" |
| October | 56°F | 81°F | 67°F | 13.0" |
| November | 45°F | 68°F | 55°F | 11.6" |
| December | 40°F | 60°F | 49°F | 6.0" |
| Index | Nesbitt | Texas | National |
| Air quality index | 38 | 52 | 42 |
| Pollution index | 3,084,680 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 296 |
| Days with moderate air quality | 67 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Hallsville, TX | 4,297 | 37 | 26.0% |
| Easton, TX | 424 | 37 | 26.0% |
| Scottsville, TX | 335 | 38 | 24.0% |
| Jefferson, TX | 2,531 | 38 | 24.0% |
| Marshall, TX | 22,881 | 38 | 24.0% |
| Nesbitt, TX | 108 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Arlington, AZ | 108 | 74 | 48.0% |
| Calvary, GA | 108 | 40 | 20.0% |
| New Liberty, IA | 108 | 46 | 8.0% |
| Shannon City, IA | 108 | 39 | 22.0% |
| Smiths Ferry, ID | 108 | 36 | 28.0% |
| Nesbitt, TX | 108 | 38 | 24.0% |
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