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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 45°F | 69°F | 56°F | 3.3" |
| February | 46°F | 70°F | 57°F | 2.5" |
| March | 49°F | 73°F | 60°F | 2.0" |
| April | 52°F | 75°F | 62°F | 0.6" |
| May | 56°F | 78°F | 65°F | 0.2" |
| June | 60°F | 83°F | 70°F | 0.0" |
| July | 65°F | 89°F | 75°F | 0.0" |
| August | 65°F | 90°F | 75°F | 0.0" |
| September | 63°F | 89°F | 74°F | 0.2" |
| October | 57°F | 82°F | 68°F | 0.5" |
| November | 50°F | 76°F | 62°F | 0.6" |
| December | 44°F | 68°F | 55°F | 2.1" |
| Index | La Crescenta-Montrose | California | National |
| Air quality index | 72 | 55 | 42 |
| Pollution index | 139,490,000 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 66 |
| Days with moderate air quality | 208 |
| Days w/ poor A.Q. for sensitive groups | 62 |
| Days with unhealthy air quality | 28 |
| Pollutant | Total |
| Arsenic | 0.200% |
| Benzene | 0.950% |
| Carbon Tetrachloride | 0.080% |
| Lead | 1.320% |
| Mercury | 0.440% |
| City | Population | Air Quality Index | National Avg. |
| Burbank CDP, CA | 4,984 | 72 | 44.0% |
| Monterey Park, CA | 60,597 | 72 | 44.0% |
| San Marino, CA | 13,020 | 72 | 44.0% |
| Duarte, CA | 21,399 | 72 | 44.0% |
| Mayflower Village, CA | 5,687 | 72 | 44.0% |
| La Crescenta-Montrose, CA | 20,171 | 72 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Kinston, NC | 20,173 | 42 | 16.0% |
| Mountain Brook, AL | 20,178 | 53 | 6.0% |
| East Hemet, CA | 20,161 | 89 | 78.0% |
| Payson, UT | 20,181 | 46 | 8.0% |
| Nogales, AZ | 20,182 | 31 | 38.0% |
| La Crescenta-Montrose, CA | 20,171 | 72 | 44.0% |
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