| 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 | Poway | California | National |
| Air quality index | 64 | 55 | 50 |
| Pollution index | 162,740 | 18,106,726 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Crest, CA | 2,733 | 64 | 28% |
| Harbison Canyon, CA | 4,128 | 64 | 28% |
| Santee, CA | 56,839 | 64 | 28% |
| Escondido, CA | 149,912 | 64 | 28% |
| San Marcos, CA | 91,479 | 64 | 28% |
| Poway, CA | 49,675 | 64 | 28% |
| City, State | Population | Air Quality Index | National Avg. |
| Ashburn, VA | 49,692 | 47 | 6% |
| Olympia, WA | 49,608 | 30 | 40% |
| Wheaton, MD | 49,764 | 47 | 6% |
| Wilson, NC | 49,558 | 36 | 28% |
| Downers Grove, IL | 49,555 | 55 | 10% |
| Poway, CA | 49,675 | 64 | 28% |
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