| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 43°F | 69°F | 57°F | 3.0" |
| February | 42°F | 69°F | 56°F | 1.3" |
| March | 44°F | 69°F | 57°F | 2.6" |
| April | 45°F | 71°F | 59°F | 1.7" |
| May | 46°F | 71°F | 59°F | 1.3" |
| June | 49°F | 74°F | 63°F | 0.4" |
| July | 50°F | 76°F | 64°F | 1.9" |
| August | 50°F | 76°F | 64°F | 1.5" |
| September | 48°F | 74°F | 62°F | 1.0" |
| October | 48°F | 74°F | 62°F | 2.6" |
| November | 47°F | 73°F | 60°F | 1.3" |
| December | 45°F | 71°F | 58°F | 4.0" |
| Index | Kapaau | Hawaii | National |
| Air quality index | 16 | 59 | 42 |
| Pollution index | 1,421,020 | 3,576,767 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 357 |
| Days with moderate air quality | 8 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hawi, HI | 1,325 | 15 | 70.0% |
| Halaula, HI | 644 | 16 | 68.0% |
| Waimea, HI | 10,969 | 16 | 68.0% |
| Waimea CDP (Kauai County), HI | 1,804 | 16 | 68.0% |
| Kapaau, HI | 1,927 | 16 | 68.0% |
| City | Population | Air Quality Index | National Avg. |
| Jeffersonville, KY | 1,927 | 33 | 34.0% |
| Glen Alpine, NC | 1,927 | 43 | 14.0% |
| Lake Ripley, WI | 1,927 | 37 | 26.0% |
| Chapleau, ON | 1,927 | n/a | |
| Port Dickinson, NY | 1,928 | 36 | 28.0% |
| Kapaau, HI | 1,927 | 16 | 68.0% |
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