| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 58°F | 47°F | 3.5" |
| February | 42°F | 62°F | 51°F | 3.9" |
| March | 45°F | 67°F | 56°F | 3.7" |
| April | 48°F | 74°F | 60°F | 2.1" |
| May | 55°F | 84°F | 69°F | 0.7" |
| June | 61°F | 92°F | 76°F | 0.3" |
| July | 65°F | 98°F | 81°F | 0.0" |
| August | 63°F | 95°F | 79°F | 0.0" |
| September | 59°F | 90°F | 74°F | 0.2" |
| October | 51°F | 79°F | 64°F | 1.2" |
| November | 44°F | 65°F | 54°F | 2.6" |
| December | 38°F | 57°F | 47°F | 4.1" |
| Index | Twain | 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 | 224 |
| Days with moderate air quality | 136 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 2 |
| 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. |
| Greenhorn, CA | 202 | 44 | 12.0% |
| Spring Garden, CA | 19 | 44 | 12.0% |
| Storrie, CA | 0 | 46 | 8.0% |
| Canyondam, CA | 0 | 46 | 8.0% |
| Keddie, CA | 68 | 46 | 8.0% |
| Twain, CA | 303 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Surrency, GA | 303 | 26 | 48.0% |
| Bagley, IA | 303 | 37 | 26.0% |
| Bush, IL | 303 | 43 | 14.0% |
| Opdyke, IL | 303 | 43 | 14.0% |
| Noble, LA | 303 | 39 | 22.0% |
| Twain, CA | 303 | 46 | 8.0% |
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