In essence, the TWI puts the brakes on rising air, preventing it from continuing to move up the windward mountain slopes, and directing the flow around the mountain instead.
The map at right shows the Kona rainfall belt as a narrow, yellow strip upslope of the Kona coast.

Frozen precipitation is a minor contributor overall. The general rule for rainfall on any of the Hawaiian islands is simple. My sellers in Hawi had a weather station, and they kept track of annual rainfall for the years they owned the home. However, fog drip, derived from direct interception of cloud droplets by vegetation, is a major source of water in the middle-elevation fog zones of Hawai‘i's mountains. However, the amount varies according to district: for instance, in Pearl Harbor, the rainfall amounts to 550 mm (21.5 in) per year, and at Black Point, it reaches 690 mm (27 in), while at the university, located near the green hills above the city, it reaches 1,000 mm (40 in) per year, with more abundant rains from November to March, and some extra showers also in summer. Annual Weather Averages Near Honolulu. Copyright, 1995-2015, REALTORS® Association of Maui, Inc. All Rights Reserved. What is also notable is that the North and South Kona districts on the Big Island have a unique weather pattern of afternoon rains, more so in summer than in winter (the rest of the island is drier in the summer months than during the winter). In general, high mean rainfall is found on the windward mountain slopes, and low rainfall prevails in leeward lowlands and on the upper slopes of the highest mountains. Contrary to what many tourists believe, Hawaii Island is the only island in the state where you’d have to worry about lava flow. The past six months have been different, and I once again find myself talking a lot about how to try to match someoneʻs dream to the realities of location, location, location. In the leeward coastal areas, where most of Hawaiʻi’s visitor industry is based and where most residents live, rainfall has a distinct annual cycle with higher rainfall in the winter months, approximately October-March (see Honolulu Airport mean monthly rainfall, right), because of the higher incidence of weather disturbances in winter.

Still, the people usually most affected by lava flow are the island’s local residents, who may have to evacuate their homes during a particularly intense bout of eruptions. As mentioned above, the Mauna Kea summit has the lowest annual total in the islands. Uplift is enhanced in the afternoons when the sun warms these slopes.

It’s only two of the last seven, including this one, that have had drier-than-average conditions.”. According to Kodama, most Hawaii locations “had below average rainfall through the dry season” for the dry season, which ran from May to September, but Maui County was hit particularly hard. What to pack: Beach clothes such as sandals, shorts and swimsuits are an obvious necessity for summer on the Big Island. Images. “On the Kona slopes of the Big Island, the summer season is their wet season. Hence, the areas within the plume may experience greater cloudiness. Get the latest email updates about the coronavirus outbreak — it's FREE! The ocean water surface temperature can get into the mid 80s Fahrenheit (27 degrees Celsius) during the summer. Av. With an overabundance of CCN, the water condensed in rising, cooling air is divided into a greater number of droplets. “But they’re getting out of their normal wet season, so I think they may be looking forward to some drier conditions.”. Hawaii Island, also known as the Big Island, is known for warm temperatures throughout the year. …, Buying property in paradise would seem to be a no brainer, right? So five of the last seven dry seasons have actually been fairly wet. On all other parts of the island and depending on which activities you choose, a light sweater may come in handy during the evenings. Note the relatively even distribution of rainfall throughout the year at windward station Mountain View (right). | 75.902°. Over the past 90-100 years, while the effects of ENSO and PDO caused large ups and downs, rainfall in Hawaiʻi has slowly declined overall. Since Hawaii Island has the largest surface area and sits at the bottom of the island chain, storms that come from the south or southeast are more likely to cause damage. There aren’t many (if any) places on the Big Island with a strict dress code, so keep it casual and comfortable.

You can email me at or via phone at (808) 443-4588. rainfall, “With the volcano continuing to be fairly quiet, it could help them with their rainfall on the Kona side,” Kodama said. Take a whale watching boat tour to see them close-up or, visit one of the many lookouts on the north and northeast shores to see them from land. Because of the protection it gets from the Hawaiian wind, this popular area of the island is fairly consistent with dry and warm weather. Climate in Hawaii. Any reproduction or use of the images, maps, graphs, data, other information, or any product derived in whole or part from these data must credit the source in the following manner: Giambelluca, T.W., Q. Chen, A.G. Frazier, J.P. Price, Y.-L. Chen, P.-S. Chu, J.K. Eischeid, and D.M. : Average precipitation in inch - DP : Days with precipitation - Sun : Hours of sunshine, Monthly averages HonoluluLongitude: -157.922, Latitude: 21.3187Average weather Honolulu, HI - 96819. Daytime will require the same clothes as summer, so make sure to pack swimsuits, shorts, T-shirts, and plenty of sun protection for the beach. “However, I think there’s a couple of factors in play in the perception of the public. The tables below give yearly averages for rainfall at cities, towns, resorts, parks and beaches in Hawaii. Amounts are greatest over upper slopes and crests and le… All content is provided without warranty of any kind. Over the lower islands, the average rainfall distribution resembles closely the topographic contours. Active lava flow may cause the closure of public or private roads, and tour companies will adjust accordingly. August and September were extremely dry, and I think that really stands out in people’s minds.
But, as air flows around the large mountains, it curves back on the leeward side and flows up these slopes, producing a belt of persistent clouds and rain (right). These disturbances often disrupt the TWI, allowing lifting to continue to much higher levels in the atmosphere.