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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 60°F | 47°F | 3.0" |
| February | 42°F | 65°F | 52°F | 2.1" |
| March | 50°F | 73°F | 61°F | 2.7" |
| April | 58°F | 80°F | 69°F | 3.8" |
| May | 65°F | 85°F | 74°F | 5.4" |
| June | 75°F | 94°F | 84°F | 4.7" |
| July | 78°F | 98°F | 87°F | 1.5" |
| August | 78°F | 99°F | 88°F | 3.0" |
| September | 72°F | 93°F | 81°F | 2.8" |
| October | 60°F | 82°F | 70°F | 3.5" |
| November | 49°F | 70°F | 58°F | 3.3" |
| December | 41°F | 61°F | 50°F | 3.0" |
| Index | Highland Park | Texas | National |
| Air quality index | 51 | 52 | 42 |
| Pollution index | 3,706,540 | 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 | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Horseshoe Bend, TX | 621 | 51 | 2.0% |
| Lewisville, TX | 107,740 | 51 | 2.0% |
| Plano, TX | 288,870 | 51 | 2.0% |
| Seagoville, TX | 16,726 | 51 | 2.0% |
| Mesquite CDP, TX | 629 | 51 | 2.0% |
| Highland Park, TX | 9,143 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Grosse Pointe Farms, MI | 9,142 | 56 | 12.0% |
| Jeannette, PA | 9,146 | 56 | 12.0% |
| Lugoff, SC | 9,146 | 43 | 14.0% |
| Gresham Park, GA | 9,148 | 52 | 4.0% |
| Lake Mohawk, NJ | 9,148 | 34 | 32.0% |
| Highland Park, TX | 9,143 | 51 | 2.0% |
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