| 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 | Escondido | 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. |
| Camp Pendleton North, CA | 7,885 | 64 | 28.0% |
| Encinitas, CA | 62,967 | 64 | 28.0% |
| San Marcos, CA | 96,219 | 64 | 28.0% |
| Poway, CA | 49,780 | 64 | 28.0% |
| Hidden Meadows, CA | 3,675 | 64 | 28.0% |
| Escondido, CA | 150,396 | 64 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Pomona, CA | 151,124 | 89 | 78.0% |
| Lévis, QC | 149,331 | n/a | |
| Killeen, TX | 148,573 | 42 | 16.0% |
| Pasadena, TX | 152,537 | 52 | 4.0% |
| Sunnyvale, CA | 152,569 | 43 | 14.0% |
| Escondido, CA | 150,396 | 64 | 28.0% |
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