| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 62°F | 48°F | 2.2" |
| February | 41°F | 66°F | 52°F | 2.9" |
| March | 49°F | 73°F | 60°F | 4.1" |
| April | 56°F | 80°F | 67°F | 3.4" |
| May | 63°F | 86°F | 73°F | 6.2" |
| June | 71°F | 93°F | 82°F | 3.9" |
| July | 73°F | 96°F | 84°F | 2.5" |
| August | 73°F | 98°F | 85°F | 2.8" |
| September | 67°F | 91°F | 78°F | 2.8" |
| October | 57°F | 83°F | 69°F | 4.0" |
| November | 48°F | 71°F | 58°F | 2.4" |
| December | 39°F | 62°F | 49°F | 1.9" |
| Index | Belton | Texas | National |
| Air quality index | 42 | 52 | 42 |
| Pollution index | 4,598,870 | 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 | 0.004% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.070% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Troy, TX | 3,023 | 38 | 24.0% |
| Harker Heights, TX | 31,657 | 42 | 16.0% |
| Nolanville, TX | 5,732 | 42 | 16.0% |
| Holland, TX | 1,574 | 42 | 16.0% |
| Killeen, TX | 148,573 | 42 | 16.0% |
| Belton, TX | 22,173 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Maple Heights, OH | 22,178 | 50 | = 100 |
| Hayesville, OR | 22,189 | 32 | 36.0% |
| Clinton, UT | 22,191 | 45 | 10.0% |
| Fort Walton Beach, FL | 22,144 | 31 | 38.0% |
| Evans, CO | 22,128 | 45 | 10.0% |
| Belton, TX | 22,173 | 42 | 16.0% |
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