| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 46°F | 71°F | 57°F | 1.9" |
| February | 50°F | 76°F | 61°F | 1.1" |
| March | 57°F | 81°F | 67°F | 2.4" |
| April | 63°F | 87°F | 73°F | 1.8" |
| May | 69°F | 91°F | 79°F | 4.0" |
| June | 73°F | 96°F | 83°F | 2.3" |
| July | 75°F | 97°F | 84°F | 4.4" |
| August | 75°F | 99°F | 85°F | 2.3" |
| September | 72°F | 93°F | 81°F | 4.9" |
| October | 63°F | 88°F | 74°F | 1.2" |
| November | 56°F | 80°F | 66°F | 1.4" |
| December | 49°F | 71°F | 59°F | 1.7" |
| Index | San Diego | Texas | National |
| Air quality index | 30 | 52 | 42 |
| Pollution index | 1,808,440 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 284 |
| Days with good air quality | 234 |
| Days with moderate air quality | 50 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Benavides, TX | 2,077 | 30 | 40.0% |
| Alice Acres, TX | 282 | 30 | 40.0% |
| Rancho Alegre, TX | 769 | 30 | 40.0% |
| Amargosa, TX | 302 | 30 | 40.0% |
| Coyote Acres, TX | 1,215 | 30 | 40.0% |
| San Diego, TX | 4,062 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Crescent Springs, KY | 4,062 | 54 | 8.0% |
| San Castle, FL | 4,061 | 36 | 28.0% |
| Boyertown, PA | 4,061 | 42 | 16.0% |
| Central Kootenay E, BC | 4,061 | n/a | |
| Montague, ON | 4,063 | n/a | |
| San Diego, TX | 4,062 | 30 | 40.0% |
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