| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 60°F | 45°F | 6.2" |
| February | 38°F | 63°F | 48°F | 5.5" |
| March | 40°F | 66°F | 51°F | 5.5" |
| April | 42°F | 71°F | 55°F | 2.8" |
| May | 47°F | 80°F | 62°F | 0.9" |
| June | 52°F | 87°F | 68°F | 0.4" |
| July | 56°F | 96°F | 74°F | 0.0" |
| August | 54°F | 95°F | 72°F | 0.0" |
| September | 50°F | 90°F | 68°F | 0.2" |
| October | 45°F | 79°F | 59°F | 2.1" |
| November | 40°F | 65°F | 51°F | 3.8" |
| December | 35°F | 57°F | 44°F | 7.1" |
| Index | Hopland | California | National |
| Air quality index | 33 | 55 | 42 |
| Pollution index | 360,238 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 334 |
| Days with moderate air quality | 27 |
| 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. |
| Cloverdale, CA | 8,854 | 31 | 38.0% |
| Lakeport, CA | 4,947 | 31 | 38.0% |
| Nice, CA | 2,407 | 31 | 38.0% |
| Boonville, CA | 997 | 33 | 34.0% |
| Talmage, CA | 1,136 | 33 | 34.0% |
| Hopland, CA | 899 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| McCloud, CA | 899 | 42 | 16.0% |
| Stonington, CT | 899 | 37 | 26.0% |
| Cascade, ID | 899 | 36 | 28.0% |
| Hazelton, ID | 899 | 20 | 60.0% |
| Teton, ID | 899 | 43 | 14.0% |
| Hopland, CA | 899 | 33 | 34.0% |
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