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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 60°F | 48°F | 2.5" |
| February | 42°F | 65°F | 53°F | 2.6" |
| March | 46°F | 69°F | 56°F | 2.7" |
| April | 48°F | 74°F | 60°F | 1.5" |
| May | 52°F | 79°F | 63°F | 0.1" |
| June | 56°F | 87°F | 69°F | 0.4" |
| July | 58°F | 90°F | 71°F | 0.0" |
| August | 58°F | 88°F | 70°F | 0.0" |
| September | 57°F | 88°F | 70°F | 0.1" |
| October | 52°F | 80°F | 64°F | 0.7" |
| November | 44°F | 67°F | 54°F | 1.6" |
| December | 39°F | 60°F | 49°F | 3.1" |
| Index | Pittsburg | 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. |
| Castle Hill, CA | 1,164 | 40 | 20.0% |
| Martinez, CA | 38,397 | 40 | 20.0% |
| Pleasant Hill, CA | 34,903 | 40 | 20.0% |
| Saranap, CA | 6,027 | 40 | 20.0% |
| Danville, CA | 44,933 | 40 | 20.0% |
| Pittsburg, CA | 71,723 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Redlands, CA | 71,680 | 89 | 78.0% |
| Gulfport, MS | 71,660 | 42 | 16.0% |
| Bowling Green, KY | 71,628 | 43 | 14.0% |
| Pawtucket, RI | 71,821 | 44 | 12.0% |
| Lauderhill, FL | 71,827 | 41 | 18.0% |
| Pittsburg, CA | 71,723 | 40 | 20.0% |
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