| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 61°F | 49°F | 1.1" |
| February | 42°F | 67°F | 54°F | 1.0" |
| March | 46°F | 74°F | 59°F | 0.7" |
| April | 49°F | 79°F | 63°F | 0.7" |
| May | 57°F | 87°F | 71°F | 0.3" |
| June | 64°F | 95°F | 80°F | 0.0" |
| July | 71°F | 101°F | 86°F | 0.0" |
| August | 70°F | 99°F | 84°F | 0.0" |
| September | 64°F | 94°F | 79°F | 0.1" |
| October | 54°F | 82°F | 67°F | 0.2" |
| November | 45°F | 70°F | 57°F | 0.5" |
| December | 38°F | 61°F | 49°F | 1.3" |
| Index | McFarland | California | National |
| Air quality index | 67 | 55 | 42 |
| Pollution index | 21,828,100 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 119 |
| Days with moderate air quality | 151 |
| Days w/ poor A.Q. for sensitive groups | 87 |
| Days with unhealthy air quality | 6 |
| Pollutant | Total |
| Arsenic | 0.160% |
| Benzene | 0.440% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.100% |
| Mercury | 0.200% |
| City | Population | Air Quality Index | National Avg. |
| Alpaugh, CA | 869 | 66 | 32.0% |
| Earlimart, CA | 8,908 | 66 | 32.0% |
| Allensworth, CA | 596 | 66 | 32.0% |
| Delano, CA | 52,821 | 67 | 34.0% |
| Wasco, CA | 27,553 | 67 | 34.0% |
| McFarland, CA | 13,244 | 67 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Bedford, IN | 13,246 | 42 | 16.0% |
| Western Springs, IL | 13,247 | 55 | 10.0% |
| Shorewood, WI | 13,248 | 44 | 12.0% |
| Richmond Hill, GA | 13,250 | 39 | 22.0% |
| Bellefontaine, OH | 13,250 | 45 | 10.0% |
| McFarland, CA | 13,244 | 67 | 34.0% |
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