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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 67°F | 51°F | 2.5" |
| February | 38°F | 68°F | 52°F | 1.6" |
| March | 40°F | 73°F | 56°F | 1.1" |
| April | 44°F | 77°F | 59°F | 0.8" |
| May | 50°F | 81°F | 64°F | 0.3" |
| June | 55°F | 90°F | 72°F | 0.0" |
| July | 62°F | 95°F | 77°F | 0.3" |
| August | 61°F | 95°F | 77°F | 0.7" |
| September | 58°F | 93°F | 74°F | 0.2" |
| October | 50°F | 83°F | 65°F | 0.3" |
| November | 41°F | 75°F | 57°F | 0.7" |
| December | 36°F | 66°F | 50°F | 2.9" |
| Index | Oak Glen | 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. |
| Calimesa, CA | 9,156 | 89 | 78.0% |
| Redlands, CA | 71,680 | 89 | 78.0% |
| Big Bear Lake, CA | 5,302 | 89 | 78.0% |
| Lake Arrowhead, CA | 9,741 | 89 | 78.0% |
| Cherry Valley, CA | 8,026 | 89 | 78.0% |
| Oak Glen, CA | 307 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Caspar, CA | 307 | 33 | 34.0% |
| Kinderhook, IL | 307 | 41 | 18.0% |
| Glenwood, IN | 307 | 28 | 44.0% |
| Switz City, IN | 307 | 1 | 98.0% |
| Lake George, MN | 307 | 29 | 42.0% |
| Oak Glen, CA | 307 | 89 | 78.0% |
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