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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 59°F | 46°F | 6.3" |
| February | 41°F | 64°F | 50°F | 4.5" |
| March | 47°F | 70°F | 57°F | 6.1" |
| April | 55°F | 77°F | 65°F | 8.2" |
| May | 62°F | 82°F | 71°F | 8.7" |
| June | 71°F | 91°F | 80°F | 9.1" |
| July | 74°F | 94°F | 83°F | 9.0" |
| August | 74°F | 94°F | 83°F | 8.4" |
| September | 69°F | 91°F | 79°F | 9.7" |
| October | 58°F | 81°F | 68°F | 13.3" |
| November | 47°F | 68°F | 56°F | 7.5" |
| December | 40°F | 60°F | 48°F | 7.9" |
| Index | Heath | Texas | National |
| Air quality index | 51 | 52 | 42 |
| Pollution index | 37,723,200 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 181 |
| Days with moderate air quality | 155 |
| Days w/ poor A.Q. for sensitive groups | 28 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.290% |
| Carbon Tetrachloride | 0.220% |
| Lead | 0.230% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Sunnyvale, TX | 6,664 | 51 | 2.0% |
| Garland, TX | 238,622 | 51 | 2.0% |
| Mobile City, TX | 206 | 51 | 2.0% |
| Plano, TX | 288,870 | 51 | 2.0% |
| Sachse, TX | 25,888 | 51 | 2.0% |
| Heath, TX | 9,069 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Grinnell, IA | 9,069 | 39 | 22.0% |
| Charlotte, MI | 9,069 | 36 | 28.0% |
| Lake Elmo, MN | 9,071 | 46 | 8.0% |
| Ogden, NC | 9,071 | 34 | 32.0% |
| Hillview, KY | 9,066 | 49 | 2.0% |
| Heath, TX | 9,069 | 51 | 2.0% |
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