| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 63°F | 48°F | 0.7" |
| February | 40°F | 68°F | 53°F | 0.5" |
| March | 46°F | 75°F | 60°F | 0.2" |
| April | 51°F | 82°F | 65°F | 0.2" |
| May | 59°F | 91°F | 74°F | 0.0" |
| June | 68°F | 102°F | 85°F | 0.0" |
| July | 75°F | 107°F | 91°F | 0.2" |
| August | 73°F | 105°F | 89°F | 0.3" |
| September | 66°F | 97°F | 81°F | 0.1" |
| October | 54°F | 85°F | 68°F | 0.2" |
| November | 43°F | 72°F | 56°F | 0.3" |
| December | 35°F | 61°F | 47°F | 0.7" |
| Index | Barstow | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 21,095,500 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 42 |
| Days with moderate air quality | 178 |
| Days w/ poor A.Q. for sensitive groups | 79 |
| Days with unhealthy air quality | 58 |
| Pollutant | Total |
| Arsenic | 1.700% |
| Benzene | 0.350% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.580% |
| Mercury | 1.550% |
| City | Population | Air Quality Index | National Avg. |
| Lenwood, CA | 4,431 | 89 | 78.0% |
| Barstow, CA | 23,547 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Hialeah Gardens, FL | 23,546 | 41 | 18.0% |
| Romulus, MI | 23,544 | 56 | 12.0% |
| West Puente Valley, CA | 23,555 | 72 | 44.0% |
| Fish Hawk, FL | 23,556 | 43 | 14.0% |
| Watertown, WI | 23,561 | 37 | 26.0% |
| Barstow, CA | 23,547 | 89 | 78.0% |
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