| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 50°F | 38°F | 2.0" |
| February | 30°F | 52°F | 40°F | 2.2" |
| March | 39°F | 63°F | 50°F | 4.8" |
| April | 48°F | 72°F | 60°F | 6.3" |
| May | 55°F | 77°F | 66°F | 5.8" |
| June | 65°F | 87°F | 75°F | 2.8" |
| July | 68°F | 91°F | 79°F | 4.7" |
| August | 67°F | 89°F | 77°F | 3.8" |
| September | 59°F | 83°F | 70°F | 3.9" |
| October | 49°F | 73°F | 60°F | 2.9" |
| November | 39°F | 61°F | 49°F | 2.9" |
| December | 31°F | 51°F | 40°F | 3.2" |
| Index | Hollister | Missouri | National |
| Air quality index | 18 | 97 | 42 |
| Pollution index | 2,364,230 | 1,630,255 | 2,726,193 |
| Measurement | Total |
| Days measured | 60 |
| Days with good air quality | 58 |
| Days with moderate air quality | 2 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Kissee Mills, MO | 1,128 | 18 | 64.0% |
| Taneyville, MO | 273 | 18 | 64.0% |
| Omaha, AR | 75 | 18 | 64.0% |
| Galena, MO | 768 | 18 | 64.0% |
| Bull Creek, MO | 527 | 18 | 64.0% |
| Hollister, MO | 4,564 | 18 | 64.0% |
| City | Population | Air Quality Index | National Avg. |
| Williamstown, MA | 4,565 | 35 | 30.0% |
| Cowichan Valley E, BC | 4,562 | n/a | |
| Rio Communities, NM | 4,566 | 53 | 6.0% |
| Raynham Center, MA | 4,561 | 44 | 12.0% |
| Portola Valley, CA | 4,568 | 43 | 14.0% |
| Hollister, MO | 4,564 | 18 | 64.0% |
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