| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 61°F | 50°F | 8.4" |
| February | 43°F | 63°F | 51°F | 6.7" |
| March | 49°F | 72°F | 59°F | 6.7" |
| April | 53°F | 76°F | 63°F | 6.5" |
| May | 61°F | 84°F | 71°F | 12.5" |
| June | 69°F | 89°F | 78°F | 5.2" |
| July | 72°F | 90°F | 79°F | 6.5" |
| August | 72°F | 94°F | 82°F | 13.0" |
| September | 70°F | 88°F | 77°F | 8.9" |
| October | 55°F | 78°F | 65°F | 1.2" |
| November | 48°F | 72°F | 57°F | 7.0" |
| December | 42°F | 64°F | 51°F | 3.3" |
| Index | Monterey | Louisiana | National |
| Air quality index | 30 | 106 | 42 |
| Pollution index | 624,663 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 119 |
| Days with good air quality | 107 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ferriday, LA | 3,247 | 30 | 40.0% |
| Minorca, LA | 1,727 | 30 | 40.0% |
| Jonesville, LA | 1,377 | 30 | 40.0% |
| Ridgecrest, LA | 680 | 30 | 40.0% |
| Monterey, LA | 371 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Farmersburg, IA | 371 | 29 | 42.0% |
| Kendrick, ID | 371 | 10 | 80.0% |
| New Point, IN | 371 | 41 | 18.0% |
| Bear Lake, MI | 371 | 36 | 28.0% |
| Clarksville, MI | 371 | 38 | 24.0% |
| Monterey, LA | 371 | 30 | 40.0% |
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