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Recent Hydrologic Conditions -- Hawaii

Latest update August 8, 2008

Mt. Waialeale Rain Gage, Kauai

The rain gage near the summit of Mt. Waialeale is at an altitude of 5,150 ft (gage photo). The gage has been in operation since 1910 but monthly totals are available only for 1950-54 and 1968 to the present. The data prior to 1993 are from unpublished monthly records. The average yearly rainfall at the gage during those years is about 392 inches and for the entire available period (1912-present) is about 427 inches. Rainfall for July 2008 (30.3 inches) can be compared with island-wide rainfall data recorded by the National Weather Service. This station is operated by Dale Nishimoto of the Honolulu field office and is equipped with a satellite transmitter delivering rainfall updates every hour (Go to real-time website for this gage.).

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Historical rainfall record

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Recent rainfall record compared with historical data

The monthly maximum and minimum data show how recent conditions compare to the range of monthly rainfall amounts measured in the historical record. The entire period of record is used to estimate the maximum, minimum, and mean monthly rainfall.