| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 58°F | 46°F | 4.2" |
| February | 40°F | 64°F | 51°F | 3.7" |
| March | 44°F | 71°F | 56°F | 3.5" |
| April | 48°F | 76°F | 61°F | 4.2" |
| May | 54°F | 86°F | 69°F | 1.1" |
| June | 60°F | 94°F | 77°F | 3.0" |
| July | 65°F | 98°F | 81°F | 0.5" |
| August | 63°F | 97°F | 79°F | 0.2" |
| September | 58°F | 93°F | 74°F | 2.3" |
| October | 50°F | 81°F | 64°F | 4.6" |
| November | 42°F | 68°F | 53°F | 3.1" |
| December | 36°F | 58°F | 45°F | 5.6" |
| Index | Porterville | California | National |
| Air quality index | 66 | 55 | 42 |
| Pollution index | 21,828,100 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 127 |
| Days with moderate air quality | 157 |
| Days w/ poor A.Q. for sensitive groups | 78 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.160% |
| Benzene | 0.440% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.100% |
| Mercury | 0.200% |
| City | Population | Air Quality Index | National Avg. |
| Lindsay, CA | 12,793 | 66 | 32.0% |
| Woodville, CA | 1,836 | 66 | 32.0% |
| Pixley, CA | 4,322 | 66 | 32.0% |
| El Rancho, CA | 0 | 66 | 32.0% |
| Plainview, CA | 610 | 66 | 32.0% |
| Porterville, CA | 59,056 | 66 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Springfield, OH | 58,957 | 45 | 10.0% |
| Fountainebleau, FL | 59,174 | 41 | 18.0% |
| San Rafael, CA | 59,178 | 40 | 20.0% |
| St. Clair Shores, MI | 59,184 | 56 | 12.0% |
| Brookline, MA | 59,223 | 43 | 14.0% |
| Porterville, CA | 59,056 | 66 | 32.0% |
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