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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 60°F | 46°F | 6.0" |
| February | 39°F | 64°F | 50°F | 5.7" |
| March | 41°F | 67°F | 52°F | 4.6" |
| April | 43°F | 71°F | 55°F | 2.4" |
| May | 46°F | 77°F | 60°F | 1.1" |
| June | 50°F | 83°F | 64°F | 0.4" |
| July | 52°F | 85°F | 65°F | 0.0" |
| August | 52°F | 84°F | 64°F | 0.0" |
| September | 49°F | 85°F | 64°F | 0.2" |
| October | 46°F | 78°F | 59°F | 2.0" |
| November | 41°F | 67°F | 52°F | 3.2" |
| December | 36°F | 59°F | 46°F | 6.9" |
| Index | Hidden Valley Lake | California | National |
| Air quality index | 31 | 55 | 42 |
| Pollution index | 360,238 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 360 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Clearlake Riviera, CA | 4,408 | 31 | 38.0% |
| Middletown, CA | 725 | 31 | 38.0% |
| Kelseyville, CA | 3,657 | 31 | 38.0% |
| Cobb, CA | 805 | 31 | 38.0% |
| Lower Lake, CA | 1,065 | 31 | 38.0% |
| Hidden Valley Lake, CA | 5,948 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Geneva, OH | 5,947 | 34 | 32.0% |
| Southold, NY | 5,946 | 41 | 18.0% |
| Kingston, TN | 5,946 | 53 | 6.0% |
| Taos, NM | 5,950 | 15 | 70.0% |
| West Hattiesburg, MS | 5,944 | 35 | 30.0% |
| Hidden Valley Lake, CA | 5,948 | 31 | 38.0% |
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