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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 66°F | 52°F | 10.0" |
| February | 44°F | 68°F | 54°F | 5.7" |
| March | 46°F | 75°F | 58°F | 2.7" |
| April | 47°F | 78°F | 60°F | 1.7" |
| May | 53°F | 83°F | 66°F | 2.2" |
| June | 55°F | 88°F | 70°F | 1.2" |
| July | 63°F | 96°F | 78°F | 0.0" |
| August | 63°F | 96°F | 78°F | 0.1" |
| September | 56°F | 88°F | 70°F | 1.0" |
| October | 51°F | 83°F | 64°F | 3.9" |
| November | 46°F | 78°F | 59°F | 19.8" |
| December | 39°F | 66°F | 51°F | 4.9" |
| Index | Lake Arrowhead | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 31,575,300 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 42 |
| Days with moderate air quality | 178 |
| Days w/ poor A.Q. for sensitive groups | 79 |
| Days with unhealthy air quality | 58 |
| Pollutant | Total |
| Arsenic | 0.110% |
| Benzene | 0.260% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.350% |
| Mercury | 0.280% |
| City | Population | Air Quality Index | National Avg. |
| Bloomington, CA | 22,506 | 89 | 78.0% |
| Oak Glen, CA | 319 | 89 | 78.0% |
| Muscoy, CA | 11,809 | 89 | 78.0% |
| San Bernardino, CA | 221,910 | 89 | 78.0% |
| Colton, CA | 55,956 | 89 | 78.0% |
| Lake Arrowhead, CA | 9,956 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Sugar Grove, IL | 9,959 | 0 | 100.0% |
| Port Townsend, WA | 9,950 | 24 | 52.0% |
| North Gates, NY | 9,942 | 37 | 26.0% |
| Brookdale, NJ | 9,973 | 51 | 2.0% |
| Morden, MB | 9,973 | n/a | |
| Lake Arrowhead, CA | 9,956 | 89 | 78.0% |
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