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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 71°F | 55°F | 0.4" |
| February | 46°F | 76°F | 60°F | 0.2" |
| March | 51°F | 83°F | 67°F | 0.1" |
| April | 56°F | 88°F | 72°F | 0.0" |
| May | 62°F | 96°F | 79°F | 0.1" |
| June | 71°F | 106°F | 89°F | 0.0" |
| July | 80°F | 109°F | 94°F | 0.2" |
| August | 80°F | 109°F | 94°F | 0.3" |
| September | 73°F | 104°F | 88°F | 0.1" |
| October | 61°F | 92°F | 76°F | 0.1" |
| November | 50°F | 81°F | 64°F | 0.1" |
| December | 42°F | 70°F | 55°F | 0.4" |
| Index | Imperial | California | National |
| Air quality index | 58 | 55 | 42 |
| Pollution index | 6,200,930 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 125 |
| Days with moderate air quality | 219 |
| Days w/ poor A.Q. for sensitive groups | 19 |
| Days with unhealthy air quality | 2 |
| 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. |
| Calexico, CA | 39,841 | 58 | 16.0% |
| Holtville, CA | 6,129 | 58 | 16.0% |
| Heber, CA | 8,413 | 58 | 16.0% |
| Seeley, CA | 1,847 | 58 | 16.0% |
| Brawley, CA | 25,942 | 58 | 16.0% |
| Imperial, CA | 18,631 | 58 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Helena, AL | 18,631 | 53 | 6.0% |
| Forest Park, OH | 18,632 | 54 | 8.0% |
| Cortland, NY | 18,633 | 34 | 32.0% |
| Culpeper, VA | 18,633 | 40 | 20.0% |
| Creve Coeur, MO | 18,627 | 54 | 8.0% |
| Imperial, CA | 18,631 | 58 | 16.0% |
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