| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 48°F | 71°F | 58°F | 0.5" |
| February | 51°F | 76°F | 62°F | 0.4" |
| March | 55°F | 83°F | 68°F | 0.2" |
| April | 60°F | 88°F | 74°F | 0.1" |
| May | 67°F | 96°F | 81°F | 0.1" |
| June | 76°F | 105°F | 90°F | 0.0" |
| July | 84°F | 108°F | 95°F | 0.5" |
| August | 83°F | 107°F | 94°F | 0.4" |
| September | 77°F | 102°F | 89°F | 0.6" |
| October | 66°F | 91°F | 78°F | 0.1" |
| November | 56°F | 80°F | 67°F | 0.4" |
| December | 47°F | 69°F | 57°F | 0.3" |
| Index | Winterhaven | California | National |
| Air quality index | 45 | 55 | 42 |
| Pollution index | 6,200,930 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 265 |
| Days with moderate air quality | 97 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.200% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.090% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Drysdale, AZ | 389 | 45 | 10.0% |
| Orange Grove Mobile Manor, AZ | 387 | 45 | 10.0% |
| Wall Lane, AZ | 411 | 45 | 10.0% |
| Avenue B and C, AZ | 3,847 | 45 | 10.0% |
| El Prado Estates, AZ | 590 | 45 | 10.0% |
| Winterhaven, CA | 151 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Kobuk, AK | 151 | 38 | 24.0% |
| Cutter, AZ | 151 | 60 | 20.0% |
| North San Juan, CA | 151 | 44 | 12.0% |
| Montezuma, CO | 151 | 47 | 6.0% |
| Register, GA | 151 | 39 | 22.0% |
| Winterhaven, CA | 151 | 45 | 10.0% |
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