| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 46°F | 2.6" |
| February | 39°F | 64°F | 51°F | 2.0" |
| March | 43°F | 70°F | 56°F | 2.0" |
| April | 46°F | 76°F | 60°F | 1.5" |
| May | 51°F | 84°F | 66°F | 0.3" |
| June | 56°F | 92°F | 73°F | 0.2" |
| July | 59°F | 97°F | 77°F | 0.1" |
| August | 59°F | 95°F | 76°F | 0.1" |
| September | 56°F | 92°F | 72°F | 0.2" |
| October | 49°F | 81°F | 64°F | 0.7" |
| November | 41°F | 68°F | 54°F | 1.2" |
| December | 36°F | 58°F | 47°F | 2.5" |
| Index | Waterloo | California | National |
| Air quality index | 45 | 55 | 50 |
| Pollution index | 1,947,800 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 229 |
| Days with moderate air quality | 123 |
| Days w/ poor A.Q. for sensitive groups | 12 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Farmington, CA | 97 | 45 | 10% |
| August, CA | 7,781 | 45 | 10% |
| Kennedy, CA | 3,641 | 45 | 10% |
| Stockton, CA | 301,443 | 45 | 10% |
| Lockeford, CA | 3,281 | 45 | 10% |
| Waterloo, CA | 496 | 45 | 10% |
| City, State | Population | Air Quality Index | National Avg. |
| Elkmont, AL | 496 | 44 | 12% |
| Knapp, WI | 496 | 34 | 32% |
| Websterville, VT | 496 | 34 | 32% |
| North San Pedro, TX | 496 | 30 | 40% |
| Buffalo, KY | 496 | 39 | 22% |
| Waterloo, CA | 496 | 45 | 10% |
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