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 Hawaii has a moderate tropical climate influenced by the warm Pacific Ocean and prevailing northeasterly trade winds. Temperatures vary little from place to place, except at higher elevations. The average annual temperature of 75 ° F (23.9° C) fluctuates only slightly from summer to winter. The recorded temperature in the state has ranged from 12° F (-11.1° C) near the summit of Mauna Kea in 1979 to 100° F (37.8° C) at Pahala (on the Big Island of Hawaii) in 1931.
In most of Hawaii there are only two seasons: "summer" between about May and October, when the sun is more nearly overhead, the weather warmer and drier, and the trade winds most persistent; and "winter," between about October and April, when the sun is in the south, the weather cooler, and the trade winds more often interrupted by other winds and by intervals of widespread cloud and rain.
With variations in altitude, wind and moisture, all of the earth's major climatic zones and seasons exist on the single island of Hawaii. Rainfall varies greatly depending on location, with almost no rainfall in certain leeward areas (southwest), and more in the windward areas (northeast) increasing to over 400 inches per year in certain mountain regions on Kauai and Maui.
Average January temperature range
Honolulu: 65° to 79° F (18.3° to 26.1° C)
Hilo: 63° to 80° F (17.2° to 26.7° C)
Average July temperature range
Honolulu: 73° to 87° F (22.8° to 30.6° C)
Hilo: 68° to 83° F (20° to 28.3° C)
Average annual temperature
Honolulu: 77° F (25° C)
Hilo: 73° F (22.8° C)
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