| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 55°F | 44°F | 5.5" |
| February | 42°F | 62°F | 51°F | 6.6" |
| March | 43°F | 71°F | 56°F | 3.9" |
| April | 44°F | 74°F | 58°F | 3.7" |
| May | 51°F | 84°F | 67°F | 3.6" |
| June | 55°F | 90°F | 72°F | 2.5" |
| July | 61°F | 99°F | 79°F | 0.6" |
| August | 59°F | 97°F | 77°F | 0.0" |
| September | 53°F | 87°F | 68°F | 1.0" |
| October | 48°F | 78°F | 61°F | 3.0" |
| November | 41°F | 68°F | 53°F | 4.2" |
| December | 38°F | 57°F | 47°F | 10.0" |
| Index | Nicolaus | California | National |
| Air quality index | 44 | 55 | 42 |
| Pollution index | 3,319,120 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 239 |
| Days with moderate air quality | 124 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.100% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.070% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Trowbridge, CA | 196 | 44 | 12.0% |
| Rio Oso, CA | 414 | 44 | 12.0% |
| Robbins, CA | 428 | 44 | 12.0% |
| Beale AFB, CA | 955 | 44 | 12.0% |
| Wheatland, CA | 3,631 | 44 | 12.0% |
| Nicolaus, CA | 124 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Hyampom, CA | 124 | 27 | 46.0% |
| Weott, CA | 124 | 27 | 46.0% |
| Osterdock, IA | 124 | 29 | 42.0% |
| Elk River, ID | 124 | 10 | 80.0% |
| Scottville, IL | 124 | 40 | 20.0% |
| Nicolaus, CA | 124 | 44 | 12.0% |
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