| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 63°F | 81°F | 71°F | 6.7" |
| February | 64°F | 80°F | 71°F | 11.2" |
| March | 65°F | 80°F | 71°F | 12.1" |
| April | 65°F | 81°F | 72°F | 8.3" |
| May | 66°F | 83°F | 74°F | 7.0" |
| June | 68°F | 83°F | 75°F | 6.0" |
| July | 69°F | 84°F | 76°F | 7.6" |
| August | 69°F | 85°F | 76°F | 8.9" |
| September | 69°F | 85°F | 76°F | 8.5" |
| October | 68°F | 84°F | 75°F | 10.4" |
| November | 67°F | 82°F | 73°F | 12.0" |
| December | 65°F | 80°F | 72°F | 15.3" |
| Index | Hilo | 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. |
| Eden Roc, HI | 700 | 16 | 68.0% |
| Hawaiian Paradise Park, HI | 10,921 | 16 | 68.0% |
| Mountain View, HI | 3,517 | 16 | 68.0% |
| Papaikou, HI | 881 | 16 | 68.0% |
| Fern Acres, HI | 1,740 | 16 | 68.0% |
| Hilo, HI | 45,248 | 16 | 68.0% |
| City | Population | Air Quality Index | National Avg. |
| West Seneca, NY | 45,272 | 39 | 22.0% |
| Herriman, UT | 45,211 | 51 | 2.0% |
| Oro Valley, AZ | 45,303 | 47 | 6.0% |
| Rockwall, TX | 45,168 | 51 | 2.0% |
| Pearl City, HI | 45,159 | 30 | 40.0% |
| Hilo, HI | 45,248 | 16 | 68.0% |
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