| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 59°F | 46°F | 8.0" |
| February | 40°F | 63°F | 49°F | 7.3" |
| March | 49°F | 72°F | 59°F | 13.8" |
| April | 56°F | 80°F | 67°F | 7.9" |
| May | 62°F | 84°F | 72°F | 12.8" |
| June | 72°F | 93°F | 82°F | 9.0" |
| July | 74°F | 95°F | 83°F | 5.9" |
| August | 74°F | 97°F | 84°F | 3.4" |
| September | 67°F | 91°F | 78°F | 20.6" |
| October | 56°F | 81°F | 67°F | 15.8" |
| November | 46°F | 68°F | 55°F | 8.6" |
| December | 41°F | 61°F | 50°F | 10.2" |
| Index | Castor | Louisiana | National |
| Air quality index | 39 | 106 | 42 |
| Pollution index | 291,967 | 2,526,475 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Edgefield, LA | 446 | 39 | 22.0% |
| Jamestown, LA | 107 | 39 | 22.0% |
| Bienville, LA | 205 | 39 | 22.0% |
| Ashland, LA | 199 | 39 | 22.0% |
| Lucky, LA | 200 | 39 | 22.0% |
| Castor, LA | 300 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Nulato, AK | 300 | 38 | 24.0% |
| Stirling City, CA | 300 | 46 | 8.0% |
| Trilby, FL | 300 | 36 | 28.0% |
| Bath, IL | 300 | 40 | 20.0% |
| Elizabethtown, IL | 300 | 44 | 12.0% |
| Castor, LA | 300 | 39 | 22.0% |
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