| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 66°F | 52°F | 2.0" |
| February | 43°F | 67°F | 53°F | 1.7" |
| March | 46°F | 69°F | 56°F | 2.0" |
| April | 47°F | 70°F | 57°F | 0.8" |
| May | 51°F | 69°F | 58°F | 0.2" |
| June | 53°F | 71°F | 60°F | 0.1" |
| July | 55°F | 72°F | 62°F | 0.0" |
| August | 56°F | 73°F | 62°F | 0.0" |
| September | 55°F | 76°F | 63°F | 0.0" |
| October | 51°F | 76°F | 61°F | 0.6" |
| November | 46°F | 70°F | 56°F | 1.4" |
| December | 40°F | 64°F | 51°F | 2.3" |
| Index | Hollister | California | National |
| Air quality index | 37 | 55 | 42 |
| Pollution index | 9,602,130 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 330 |
| Days with moderate air quality | 34 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.070% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.080% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Ridgemark, CA | 2,572 | 37 | 26.0% |
| Gilroy, CA | 55,227 | 37 | 26.0% |
| Salinas, CA | 156,177 | 37 | 26.0% |
| San Juan Bautista, CA | 2,086 | 37 | 26.0% |
| Tres Pinos, CA | 921 | 37 | 26.0% |
| Hollister, CA | 40,100 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Cape Girardeau, MO | 40,100 | 44 | 12.0% |
| San Gabriel, CA | 40,108 | 72 | 44.0% |
| Quincy, IL | 40,111 | 41 | 18.0% |
| Spanish Fork, UT | 40,069 | 46 | 8.0% |
| Montclair, CA | 40,041 | 89 | 78.0% |
| Hollister, CA | 40,100 | 37 | 26.0% |
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