| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 42°F | 72°F | 56°F | 0.6" |
| February | 46°F | 76°F | 61°F | 0.7" |
| March | 52°F | 83°F | 68°F | 0.3" |
| April | 56°F | 88°F | 73°F | 0.0" |
| May | 62°F | 96°F | 80°F | 0.1" |
| June | 71°F | 105°F | 89°F | 0.2" |
| July | 78°F | 109°F | 94°F | 0.1" |
| August | 78°F | 108°F | 94°F | 0.1" |
| September | 72°F | 103°F | 88°F | 0.1" |
| October | 60°F | 92°F | 76°F | 0.1" |
| November | 50°F | 81°F | 65°F | 0.1" |
| December | 41°F | 70°F | 55°F | 0.3" |
| Index | Ocotillo | California | National |
| Air quality index | 58 | 55 | 42 |
| Pollution index | 162,740 | 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 | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Jacumba, CA | 579 | 58 | 16.0% |
| Ocotillo, CA | 44 | 58 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Whitley Gardens, CA | 44 | 46 | 8.0% |
| Crestone, CO | 44 | 16 | 68.0% |
| Lynn, CO | 44 | 20 | 60.0% |
| Fenwick, CT | 44 | 37 | 26.0% |
| Delphos, IA | 44 | 43 | 14.0% |
| Ocotillo, CA | 44 | 58 | 16.0% |
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