| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 60°F | 47°F | 3.9" |
| February | 43°F | 65°F | 52°F | 11.6" |
| March | 50°F | 74°F | 60°F | 11.2" |
| April | 54°F | 78°F | 64°F | 2.4" |
| May | 64°F | 84°F | 73°F | 19.3" |
| June | 71°F | 91°F | 80°F | 32.6" |
| July | 72°F | 93°F | 81°F | 5.9" |
| August | 73°F | 95°F | 83°F | 20.9" |
| September | 69°F | 94°F | 80°F | 52.8" |
| October | 57°F | 84°F | 69°F | 0.5" |
| November | 50°F | 74°F | 60°F | 5.4" |
| December | 38°F | 66°F | 50°F | 7.0" |
| Index | Troy | Texas | National |
| Air quality index | 38 | 52 | 42 |
| Pollution index | 4,598,870 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.070% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bruceville-Eddy, TX | 1,736 | 38 | 24.0% |
| Golinda, TX | 672 | 38 | 24.0% |
| Chilton, TX | 684 | 38 | 24.0% |
| Lorena, TX | 1,878 | 38 | 24.0% |
| Moody, TX | 1,560 | 38 | 24.0% |
| Troy, TX | 3,109 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Platteville, CO | 3,108 | 45 | 10.0% |
| Epping, NH | 3,108 | 37 | 26.0% |
| West Brattleboro, VT | 3,108 | 34 | 32.0% |
| Leesburg, GA | 3,110 | 40 | 20.0% |
| Norco, LA | 3,110 | 45 | 10.0% |
| Troy, TX | 3,109 | 38 | 24.0% |
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