| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 67°F | 54°F | 7.3" |
| February | 47°F | 67°F | 56°F | 5.9" |
| March | 49°F | 69°F | 58°F | 2.1" |
| April | 49°F | 70°F | 58°F | 1.5" |
| May | 54°F | 72°F | 62°F | 0.4" |
| June | 57°F | 73°F | 64°F | 0.3" |
| July | 61°F | 78°F | 68°F | 0.5" |
| August | 63°F | 80°F | 70°F | 0.0" |
| September | 59°F | 80°F | 69°F | 0.8" |
| October | 57°F | 78°F | 66°F | 1.1" |
| November | 51°F | 74°F | 62°F | 2.1" |
| December | 44°F | 68°F | 56°F | 2.2" |
| Index | Jamul | 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% |
| Descanso, CA | 1,398 | 64 | 28.0% |
| Crest, CA | 2,721 | 64 | 28.0% |
| Harbison Canyon, CA | 4,355 | 64 | 28.0% |
| Jamul, CA | 5,776 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Peace River B, BC | 5,776 | n/a | |
| Finderne, NJ | 5,775 | 41 | 18.0% |
| Saint-Pie, QC | 5,775 | n/a | |
| Moosic, PA | 5,777 | 38 | 24.0% |
| Dickson City, PA | 5,778 | 38 | 24.0% |
| Jamul, CA | 5,776 | 64 | 28.0% |
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