Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 46°F | 70°F | 57°F | 2.6" |
February | 48°F | 70°F | 58°F | 2.5" |
March | 51°F | 72°F | 60°F | 1.0" |
April | 53°F | 74°F | 62°F | 0.6" |
May | 57°F | 75°F | 65°F | 0.3" |
June | 61°F | 78°F | 67°F | 0.0" |
July | 65°F | 83°F | 71°F | 0.2" |
August | 65°F | 85°F | 72°F | 0.0" |
September | 63°F | 85°F | 72°F | 0.3" |
October | 59°F | 81°F | 68°F | 0.5" |
November | 52°F | 76°F | 62°F | 0.7" |
December | 46°F | 69°F | 56°F | 2.7" |
Index | Signal Hill | California | National |
Air quality index | 72 | 55 | 42 |
Pollution index | 4,251,410 | 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 | 0.010% |
Benzene | 0.100% |
Carbon Tetrachloride | 0.000% |
Lead | 0.010% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Hacienda Heights, CA | 55,386 | 72 | 44.0% |
Westmont, CA | 35,188 | 72 | 44.0% |
Bell Gardens, CA | 41,770 | 72 | 44.0% |
Downey, CA | 111,263 | 72 | 44.0% |
La Habra Heights, CA | 5,318 | 72 | 44.0% |
Signal Hill, CA | 11,430 | 72 | 44.0% |
City | Population | Air Quality Index | National Avg. |
Pontiac, IL | 11,430 | 44 | 12.0% |
Urbana, OH | 11,428 | 45 | 10.0% |
Selkirk, MB | 11,428 | n/a | |
Gardnerville Ranchos, NV | 11,432 | 13 | 74.0% |
Manvel, TX | 11,432 | 52 | 4.0% |
Signal Hill, CA | 11,430 | 72 | 44.0% |