| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 61°F | 77°F | 68°F | 4.4" |
| February | 62°F | 76°F | 68°F | 3.7" |
| March | 63°F | 77°F | 69°F | 8.8" |
| April | 64°F | 78°F | 71°F | 2.9" |
| May | 65°F | 80°F | 72°F | 3.2" |
| June | 67°F | 82°F | 74°F | 1.8" |
| July | 68°F | 83°F | 75°F | 2.3" |
| August | 69°F | 84°F | 76°F | 3.4" |
| September | 68°F | 83°F | 75°F | 2.2" |
| October | 67°F | 82°F | 74°F | 3.1" |
| November | 66°F | 80°F | 72°F | 3.5" |
| December | 64°F | 77°F | 70°F | 6.2" |
| Index | Haleiwa | Hawaii | National |
| Air quality index | 30 | 59 | 42 |
| Pollution index | 2,893,180 | 3,576,767 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 347 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.090% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Royal Kunia, HI | 13,857 | 30 | 40.0% |
| Waipahu, HI | 38,276 | 30 | 40.0% |
| Whitmore Village, HI | 3,764 | 30 | 40.0% |
| Halawa, HI | 13,953 | 30 | 40.0% |
| Pearl City, HI | 45,159 | 30 | 40.0% |
| Haleiwa, HI | 4,589 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Palacios, TX | 4,589 | 31 | 38.0% |
| Breckenridge Hills, MO | 4,590 | 54 | 8.0% |
| Montebello, NY | 4,590 | 51 | 2.0% |
| Melville, SK | 4,590 | n/a | |
| Wayzata, MN | 4,591 | 46 | 8.0% |
| Haleiwa, HI | 4,589 | 30 | 40.0% |
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