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NOAA > NWS > WFO HFO Home Page > Hydrology > June 2012 Precipitation Summary
June 2012 Precipitation Summary
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State of Hawaii

MONTH: June 2012

PREPARED: July 10, 2012

Note:  This summary uses the arithmetic mean, or average, for “normal” rainfall values.

State: [Text data table for rain gages]

Aside from a mid-month disruption, trade wind conditions dominated the weather pattern across the island chain during the month of June.  Wind speeds were mainly in the moderate to fresh range with a couple of periods in the fresh to strong range (June 17-18 and 24-26).  Shower areas embedded within the trade wind flow and enhanced by the mountainous terrain produced near to above average rainfall totals over the windward slopes of the Big Island, Maui, and Molokai.  Windward areas of Oahu and Kauai also received regular trade wind showers but daily totals were for the most part lower than on the Big Island and Maui.  No significant flooding problems were reported anywhere in the state.

Unfortunately for the leeward areas, dry conditions prevailed and most sites reported below average rainfall totals.  Existing drought conditions continued and brush fires occurred in all four counties.  For more information on the ongoing drought, please refer to the latest Drought Information Statement at: http://www.prh.noaa.gov/hnl/pages/DGT.php

Island of Kauai : [June 2012 map] [Year-to-date map]

Although a few gages on the northwest portion of Kauai reported above average rainfall, most of the gages across the rest of the island posted below average June totals.  All of the leeward sites had totals below 50 percent of average.  The U.S. Geological Survey’s (USGS) Mount Waialeale gage had the highest monthly total of 21.43 inches (65 percent of average) and the highest daily total of 4.48 inches on June 19.  Lihue Airport’s daily rainfall frequency was near normal but the average rainfall per day was well below normal.

Despite the overall dry conditions over the past two months, rainfall totals for 2012 through the end of June remain near to above average at most of the sites across Kauai due to the very wet conditions earlier in the year.  Mount Waialeale’s 201.52 inches (107 percent of average) continues to lead all totals throughout the state.

Island of Oahu: [June 2012 map] [Year-to-date map]

Most of the gages on Oahu posted below average rainfall totals for the month of June.  Leeward sites received more rain than in May overall but several monthly totals still came in at less than 50 percent of average.  The U.S. Fish and Wildlife Service’s Oahu Forest National Wildlife Refuge (NWR) gage had the highest monthly total of 15.16 inches (91 percent of average) and the highest daily total of 2.48 inches on June 26.  The Nuuanu Upper gage recorded rainfall on 29 out of 30 days in the month but its June total of 5.36 inches was only 62 percent of average.

Most of the gages along the slopes of the Koolau Range had near average rainfall totals for 2012 through the end of June.  Most of the totals from the slopes of the Waianae Range were less than 60 percent of average.  The Oahu Forest NWR gage had the highest year-to-date total of 102.26 inches (96 percent of average) which was fourth highest statewide.

Maui County: [Maui June 2012 map] [Year-to-date map] [Molokai/Lanai June 2012 map] [Year-to-date map]

Most of the gages in the windward areas of Maui and Molokai received above average rainfall for the month of June.  Some of the rainfall made it into the Kula section of Upcountry Maui with the Kula Branch Station gage showing the highest June rainfall total since 2003.  Very little precipitation made it into the drought-plagued leeward areas since Kepuni recorded only 0.05 inches (5 percent of average), Lahainaluna only 0.06 inches (9 percent), and Kihei did not record any measurable amount.  The USGS gage on Puu Kukui recorded the highest monthly total of 27.26 inches (93 percent of average) and the highest daily total of 5.94 inches on June 23.

Most of the Maui County gages had totals below 60 percent of average for 2012 through the end of June.  Puu Kukui’s 145.23 inches (76 percent of average) was the highest total in the county and remained as the second highest year-to-date total in the state.

Island of Hawaii: [June 2012 map] [Year-to-date map]

Windward areas of the Big Island had a wet June overall with nearly all sites reporting near to above average monthly totals.  However, leeward areas remained very dry.  Most of the leeward gages recorded monthly totals at less than 50 percent of average.  The USGS’ gage at Kawainui Stream had a monthly total of 33.80 inches (342 percent of average), which was the highest total statewide for June and the Big Island’s highest daily total of 3.52 inches on June 20.

Most of the windward Big Island gages had near average rainfall totals for 2012 through the end of June.  Most of the leeward gages remained at less than 60 percent of average.  Wet June conditions at the Kawainui Stream rain gage pushed its year-to-date total to the top among Big Island sites with 93.47 inches (120 percent of average).

Data Sources: Data used in this report are largely from National Weather Service sources including climate network weather observation stations at Lïhue, Honolulu, Kahului, and Hilo, the Hydronet state network of automated rain gages, and selected Cooperative Observer sites. Additional data come from automated rain gages operated by the State of Hawai‘i Department of Land and Natural Resources, the US Geological Survey, the US Bureau of Land Management, the US National Park Service, the Department of Defense, and the US Fish and Wildlife Service. Data presented here are not certified and should be used for information purposes only.

Kevin R. Kodama
Senior Service Hydrologist
NOAA/NWS Weather Forecast Office Honolulu