Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 39°F | 58°F | 48°F | 3.3" |
February | 43°F | 62°F | 52°F | 3.0" |
March | 45°F | 67°F | 54°F | 1.8" |
April | 47°F | 71°F | 57°F | 1.9" |
May | 52°F | 78°F | 63°F | 0.6" |
June | 56°F | 85°F | 68°F | 0.0" |
July | 58°F | 90°F | 71°F | 0.0" |
August | 57°F | 90°F | 70°F | 0.0" |
September | 56°F | 86°F | 68°F | 0.0" |
October | 50°F | 77°F | 62°F | 1.4" |
November | 45°F | 68°F | 55°F | 1.2" |
December | 40°F | 57°F | 47°F | 2.3" |
Index | Walnut Creek | California | National |
Air quality index | 40 | 55 | 42 |
Pollution index | 13,698,500 | 10,473,190 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 290 |
Days with moderate air quality | 74 |
Days w/ poor A.Q. for sensitive groups | 1 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.040% |
Benzene | 0.110% |
Carbon Tetrachloride | 0.330% |
Lead | 0.070% |
Mercury | 0.120% |
City | Population | Air Quality Index | National Avg. |
Alhambra Valley, CA | 1,051 | 40 | 20.0% |
Lafayette, CA | 25,949 | 40 | 20.0% |
Pacheco, CA | 4,775 | 40 | 20.0% |
San Miguel CDP (San Luis Obispo County), CA | 2,696 | 40 | 20.0% |
Ashland, CA | 23,566 | 40 | 20.0% |
Walnut Creek, CA | 69,836 | 40 | 20.0% |
City | Population | Air Quality Index | National Avg. |
Passaic, NJ | 69,789 | 51 | 2.0% |
Glen Burnie, MD | 69,649 | 46 | 8.0% |
Greenville, SC | 69,648 | 46 | 8.0% |
Marysville, WA | 69,629 | 24 | 52.0% |
Lynwood, CA | 69,625 | 72 | 44.0% |
Walnut Creek, CA | 69,836 | 40 | 20.0% |