| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 45°F | 69°F | 56°F | 2.3" |
| February | 46°F | 69°F | 56°F | 2.5" |
| March | 48°F | 71°F | 58°F | 1.2" |
| April | 50°F | 73°F | 61°F | 0.7" |
| May | 55°F | 74°F | 63°F | 0.5" |
| June | 59°F | 78°F | 67°F | 0.0" |
| July | 63°F | 82°F | 71°F | 0.3" |
| August | 64°F | 83°F | 72°F | 0.0" |
| September | 62°F | 84°F | 71°F | 0.2" |
| October | 56°F | 81°F | 67°F | 0.5" |
| November | 50°F | 76°F | 61°F | 1.0" |
| December | 45°F | 69°F | 55°F | 2.8" |
| Index | Santee | 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. |
| Coronado, CA | 25,502 | 64 | 28.0% |
| National City, CA | 63,422 | 64 | 28.0% |
| Alpine, CA | 15,370 | 64 | 28.0% |
| El Cajon, CA | 105,484 | 64 | 28.0% |
| Lakeside, CA | 21,636 | 64 | 28.0% |
| Santee, CA | 59,609 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Casa Grande, AZ | 59,608 | 74 | 48.0% |
| Huntington Park, CA | 59,591 | 72 | 44.0% |
| Huntersville, NC | 59,572 | 49 | 2.0% |
| Blainville, QC | 59,647 | n/a | |
| Sarasota, FL | 59,705 | 38 | 24.0% |
| Santee, CA | 59,609 | 64 | 28.0% |