| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 48°F | 35°F | 1.4" |
| February | 28°F | 55°F | 40°F | 1.1" |
| March | 32°F | 62°F | 46°F | 0.6" |
| April | 37°F | 68°F | 51°F | 0.5" |
| May | 45°F | 76°F | 60°F | 0.6" |
| June | 53°F | 87°F | 70°F | 0.3" |
| July | 61°F | 96°F | 79°F | 0.3" |
| August | 58°F | 93°F | 76°F | 0.2" |
| September | 50°F | 86°F | 67°F | 0.1" |
| October | 40°F | 73°F | 55°F | 0.8" |
| November | 30°F | 60°F | 44°F | 0.6" |
| December | 23°F | 48°F | 35°F | 1.1" |
| Index | Herlong | California | National |
| Air quality index | 46 | 55 | 42 |
| Pollution index | 1,799,830 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 244 |
| Days with moderate air quality | 121 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Milford, CA | 117 | 46 | 8.0% |
| Patton Village, CA | 635 | 46 | 8.0% |
| Doyle, CA | 745 | 46 | 8.0% |
| Herlong, CA | 1,272 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Ashland, IL | 1,272 | 40 | 20.0% |
| Shawneetown, IL | 1,272 | 45 | 10.0% |
| Norridgewock, ME | 1,272 | 28 | 44.0% |
| Belmont, NH | 1,272 | 31 | 38.0% |
| Big Bend, WI | 1,272 | 44 | 12.0% |
| Herlong, CA | 1,272 | 46 | 8.0% |
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