| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 68°F | 51°F | 2.8" |
| February | 37°F | 68°F | 51°F | 2.8" |
| March | 39°F | 71°F | 54°F | 1.5" |
| April | 42°F | 73°F | 57°F | 0.9" |
| May | 48°F | 77°F | 61°F | 0.5" |
| June | 51°F | 85°F | 67°F | 0.0" |
| July | 57°F | 90°F | 72°F | 0.3" |
| August | 57°F | 91°F | 73°F | 0.1" |
| September | 55°F | 90°F | 71°F | 0.2" |
| October | 48°F | 82°F | 63°F | 0.7" |
| November | 41°F | 75°F | 57°F | 1.1" |
| December | 36°F | 66°F | 50°F | 3.2" |
| Index | Lakeside | California | National |
| Air quality index | 64 | 55 | 42 |
| Pollution index | 162,740 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 87 |
| Days with moderate air quality | 253 |
| Days w/ poor A.Q. for sensitive groups | 23 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Chula Vista, CA | 268,779 | 64 | 28.0% |
| National City, CA | 61,342 | 64 | 28.0% |
| Alpine, CA | 14,958 | 64 | 28.0% |
| El Cajon, CA | 103,249 | 64 | 28.0% |
| La Mesa, CA | 60,208 | 64 | 28.0% |
| Lakeside, CA | 21,032 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Shenandoah, LA | 21,045 | 45 | 10.0% |
| Chambersburg, PA | 21,017 | 36 | 28.0% |
| DeBary, FL | 21,053 | 37 | 26.0% |
| Eustis, FL | 21,010 | 37 | 26.0% |
| Holiday, FL | 21,006 | 43 | 14.0% |
| Lakeside, CA | 21,032 | 64 | 28.0% |
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