| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 44°F | 69°F | 56°F | 2.3" |
| February | 45°F | 70°F | 57°F | 2.0" |
| March | 48°F | 74°F | 60°F | 1.2" |
| April | 51°F | 77°F | 62°F | 0.7" |
| May | 55°F | 81°F | 66°F | 0.4" |
| June | 60°F | 88°F | 72°F | 0.0" |
| July | 65°F | 94°F | 77°F | 0.1" |
| August | 65°F | 95°F | 78°F | 0.0" |
| September | 64°F | 93°F | 76°F | 0.2" |
| October | 57°F | 84°F | 69°F | 0.4" |
| November | 49°F | 77°F | 62°F | 0.6" |
| December | 43°F | 68°F | 55°F | 2.6" |
| Index | Glendora | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 139,490,000 | 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 | 0.200% |
| Benzene | 0.950% |
| Carbon Tetrachloride | 0.080% |
| Lead | 1.320% |
| Mercury | 0.440% |
| City | Population | Air Quality Index | National Avg. |
| Industry, CA | 264 | 72 | 44.0% |
| South San Jose Hills, CA | 19,104 | 72 | 44.0% |
| West Covina, CA | 105,808 | 72 | 44.0% |
| Pico Rivera, CA | 62,507 | 72 | 44.0% |
| Whittier, CA | 84,821 | 72 | 44.0% |
| Glendora, CA | 51,087 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Battle Creek, MI | 51,084 | 38 | 24.0% |
| Wheaton, MD | 51,191 | 47 | 6.0% |
| Florissant, MO | 51,220 | 54 | 8.0% |
| Grand Island, NE | 51,250 | 19 | 62.0% |
| Wylie, TX | 51,251 | 51 | 2.0% |
| Glendora, CA | 51,087 | 89 | 78.0% |
Here are the best places to live in California
Top 10 best public schools in Glendora
Top 10 cities in California with the best education system
Check out the 10 safest cities in California