| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 57°F | 46°F | 2.1" |
| February | 39°F | 63°F | 50°F | 1.7" |
| March | 43°F | 70°F | 55°F | 1.5" |
| April | 46°F | 75°F | 60°F | 1.4" |
| May | 52°F | 85°F | 68°F | 0.3" |
| June | 58°F | 93°F | 76°F | 0.2" |
| July | 63°F | 98°F | 80°F | 0.0" |
| August | 61°F | 96°F | 78°F | 0.0" |
| September | 57°F | 92°F | 74°F | 0.0" |
| October | 50°F | 81°F | 64°F | 0.6" |
| November | 42°F | 67°F | 53°F | 1.0" |
| December | 36°F | 57°F | 45°F | 1.8" |
| Index | Snelling | California | National |
| Air quality index | 48 | 55 | 42 |
| Pollution index | 5,213,360 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 213 |
| Days with moderate air quality | 145 |
| Days w/ poor A.Q. for sensitive groups | 7 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.040% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Coulterville, CA | 23 | 39 | 22.0% |
| Lake Don Pedro, CA | 1,465 | 39 | 22.0% |
| Cressey, CA | 243 | 48 | 4.0% |
| Franklin, CA | 7,709 | 48 | 4.0% |
| Winton, CA | 11,619 | 48 | 4.0% |
| Snelling, CA | 115 | 48 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Nikolai, AK | 115 | 31 | 38.0% |
| Onycha, AL | 115 | 35 | 30.0% |
| Staves, AR | 115 | 32 | 36.0% |
| Wet Camp Village, AZ | 115 | 74 | 48.0% |
| Mettler, CA | 115 | 67 | 34.0% |
| Snelling, CA | 115 | 48 | 4.0% |
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