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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 63°F | 50°F | 3.5" |
| February | 42°F | 64°F | 52°F | 2.9" |
| March | 44°F | 65°F | 53°F | 3.5" |
| April | 45°F | 68°F | 55°F | 1.6" |
| May | 48°F | 70°F | 57°F | 0.3" |
| June | 51°F | 73°F | 60°F | 0.2" |
| July | 54°F | 73°F | 61°F | 0.0" |
| August | 54°F | 73°F | 62°F | 0.0" |
| September | 53°F | 76°F | 62°F | 0.1" |
| October | 50°F | 75°F | 60°F | 0.9" |
| November | 44°F | 68°F | 54°F | 1.7" |
| December | 39°F | 62°F | 49°F | 3.6" |
| Index | Day Valley | California | National |
| Air quality index | 35 | 55 | 42 |
| Pollution index | 5,429,550 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 347 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.050% |
| Mercury | 0.150% |
| City | Population | Air Quality Index | National Avg. |
| Brookdale, CA | 1,293 | 35 | 30.0% |
| Ben Lomond, CA | 7,378 | 35 | 30.0% |
| La Selva Beach, CA | 2,544 | 35 | 30.0% |
| Pajaro Dunes, CA | 235 | 35 | 30.0% |
| Rio del Mar, CA | 9,713 | 35 | 30.0% |
| Day Valley, CA | 3,414 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Johnston City, IL | 3,414 | 43 | 14.0% |
| West Liberty, KY | 3,414 | 42 | 16.0% |
| Hanover, MN | 3,414 | 46 | 8.0% |
| New Hampton, IA | 3,413 | 39 | 22.0% |
| Maiden, NC | 3,413 | 36 | 28.0% |
| Day Valley, CA | 3,414 | 35 | 30.0% |
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