| 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 | Redlands | California | National |
| Air quality index | 89 | 55 | 50 |
| Pollution index | 31,575,300 | 18,106,726 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Lake Arrowhead, CA | 11,307 | 89 | 78% |
| Cherry Valley, CA | 7,424 | 89 | 78% |
| Loma Linda, CA | 23,859 | 89 | 78% |
| Riverside, CA | 318,678 | 89 | 78% |
| Crestline, CA | 8,900 | 89 | 78% |
| Redlands, CA | 70,442 | 89 | 78% |
| City, State | Population | Air Quality Index | National Avg. |
| Lauderhill, FL | 70,452 | 41 | 18% |
| Passaic, NJ | 70,536 | 51 | 2% |
| Franklin, TN | 70,625 | 45 | 10% |
| Rock Hill, SC | 70,251 | 49 | 2% |
| Framingham, MA | 70,743 | 40 | 20% |
| Redlands, CA | 70,442 | 89 | 78% |
Here are the best places to live in California
Check out the 10 safest cities in California
Top 10 best public schools in Redlands
10 Best cities in California for employment