| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 46°F | 1.5" |
| February | 39°F | 65°F | 51°F | 1.2" |
| March | 42°F | 72°F | 57°F | 1.0" |
| April | 46°F | 78°F | 62°F | 0.6" |
| May | 52°F | 87°F | 70°F | 0.3" |
| June | 58°F | 95°F | 78°F | 0.1" |
| July | 63°F | 101°F | 83°F | 0.0" |
| August | 62°F | 99°F | 81°F | 0.0" |
| September | 58°F | 94°F | 76°F | 0.0" |
| October | 49°F | 83°F | 65°F | 0.3" |
| November | 41°F | 69°F | 54°F | 0.6" |
| December | 35°F | 59°F | 46°F | 1.3" |
| Index | Riverdale | California | National |
| Air quality index | 56 | 55 | 42 |
| Pollution index | 16,639,200 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 152 |
| Days with moderate air quality | 172 |
| Days w/ poor A.Q. for sensitive groups | 37 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.210% |
| Benzene | 0.250% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.180% |
| Mercury | 0.230% |
| City | Population | Air Quality Index | National Avg. |
| Hanford, CA | 57,339 | 56 | 12.0% |
| Hardwick, CA | 155 | 56 | 12.0% |
| Home Garden, CA | 1,590 | 56 | 12.0% |
| Lanare, CA | 241 | 56 | 12.0% |
| Armona, CA | 4,437 | 56 | 12.0% |
| Riverdale, CA | 2,727 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake Arrowhead, ME | 2,727 | 40 | 20.0% |
| Marlborough, MO | 2,727 | 54 | 8.0% |
| Stigler, OK | 2,727 | 5 | 90.0% |
| North Rock Springs, WY | 2,727 | 46 | 8.0% |
| Stanstead, QC | 2,727 | n/a | |
| Riverdale, CA | 2,727 | 56 | 12.0% |
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