| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 58°F | 44°F | 2.3" |
| February | 37°F | 63°F | 48°F | 1.6" |
| March | 46°F | 72°F | 58°F | 2.8" |
| April | 53°F | 78°F | 65°F | 3.4" |
| May | 60°F | 84°F | 72°F | 4.1" |
| June | 70°F | 93°F | 81°F | 3.8" |
| July | 72°F | 96°F | 84°F | 3.0" |
| August | 73°F | 97°F | 84°F | 3.7" |
| September | 64°F | 89°F | 76°F | 3.2" |
| October | 53°F | 80°F | 65°F | 4.3" |
| November | 44°F | 69°F | 55°F | 2.9" |
| December | 35°F | 59°F | 45°F | 1.6" |
| Index | Chico | Texas | National |
| Air quality index | 26 | 52 | 42 |
| Pollution index | 1,399,310 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 345 |
| Days with good air quality | 308 |
| Days with moderate air quality | 37 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Sunset CDP (Starr County), TX | 15 | 26 | 48.0% |
| Alvord, TX | 1,104 | 26 | 48.0% |
| Sunset, TX | 651 | 26 | 48.0% |
| Paradise, TX | 502 | 33 | 34.0% |
| Lake Bridgeport, TX | 305 | 33 | 34.0% |
| Chico, TX | 1,166 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Whitewater, CA | 1,166 | 89 | 78.0% |
| Cullen, LA | 1,166 | 39 | 22.0% |
| Elbow Lake, MN | 1,166 | 33 | 34.0% |
| Taylors Falls, MN | 1,166 | 46 | 8.0% |
| Garland, NC | 1,166 | 30 | 40.0% |
| Chico, TX | 1,166 | 26 | 48.0% |
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