| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 61°F | 48°F | 7.2" |
| February | 43°F | 65°F | 52°F | 2.5" |
| March | 50°F | 74°F | 60°F | 10.2" |
| April | 54°F | 78°F | 64°F | 15.3" |
| May | 64°F | 84°F | 73°F | 7.4" |
| June | 71°F | 91°F | 80°F | 18.5" |
| July | 72°F | 92°F | 81°F | 8.6" |
| August | 74°F | 94°F | 83°F | 13.3" |
| September | 70°F | 94°F | 80°F | 6.3" |
| October | 57°F | 84°F | 69°F | 2.9" |
| November | 51°F | 74°F | 61°F | 4.9" |
| December | 38°F | 65°F | 50°F | 2.5" |
| Index | Jarrell | Texas | National |
| Air quality index | 42 | 52 | 42 |
| Pollution index | 1,922,400 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 284 |
| Days with moderate air quality | 79 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bartlett, TX | 1,658 | 42 | 16.0% |
| Florence, TX | 816 | 42 | 16.0% |
| Holland, TX | 1,574 | 42 | 16.0% |
| Granger, TX | 1,146 | 42 | 16.0% |
| Salado, TX | 2,848 | 42 | 16.0% |
| Jarrell, TX | 1,392 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Forreston, IL | 1,392 | 42 | 16.0% |
| Hoopers Creek, NC | 1,392 | 44 | 12.0% |
| Milroy, PA | 1,392 | 44 | 12.0% |
| Charlestown, RI | 1,392 | 37 | 26.0% |
| Macpherson-Grizzly Valley, YT | 1,392 | n/a | |
| Jarrell, TX | 1,392 | 42 | 16.0% |
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