Downloads

Click on the underlined links below to download the files. All data files with a “.zip” at the end need to be unzipped after downloading (using WinZIP, WinRAR, 7-Zip, or a similar program).  Please regard Conditions of Use for all Rainfall Atlas products and refer to our How To Cite page for citation information.  

All mean map products use the 30 year base period 1978-2007.

**The Moloka‘i maps have been updated! Using new information from stream gauges and additional vegetation data, we have a produced improved maps of mean rainfall for the island of Moloka‘i. All files below have been updated with these new maps.**

Map Images

Image files of the color zone rainfall maps as well as the isohyets have been created and are available for download as *.TIF files. The user has a choice of inches or millimeters, and each compressed *.zip file contains all 12 months plus the annual map. The color maps are available at a statewide extent as well as for each county, while the isohyets maps are only available for each island county (Maui Nui includes the islands of Maui, Moloka‘i, Lāna‘i and Kaho‘olawe).

 

Isohyets:

Isohyet Images

These images show the mean monthly rainfall as isohyets, or lines of equal rainfall. Both sets of isohyets (inches and mm) were created at appropriate intervals for their units, and therefore are not direct conversions of each other, though they are derived from the same data. The labels are included where they can fit, which means that not all isohyets are labeled, especially in steep gradient areas. Please see the interactive map or download the GIS or Google Earth layers for more information on isohyets labels.

 

Files for download:

CoverageInchesMillimeters
Hawai‘i HawaiiIsohyetTIFs_inches.zip HawaiiIsohyetTIFs_mm.zip
Kaua‘i KauaiIsohyetTIFs_inches.zip KauaiIsohyetTIFs_mm.zip
Maui Nui MauiNuiIsohyetTIFs_inches.zip MauiNuiIsohyetTIFs_mm.zip
O‘ahu OahuIsohyetTIFs_inches.zip OahuIsohyetTIFs_mm.zip

 

Color Maps:

Color Map Images

Unlike the interactive map which shows the rainfall as a continuous color ramp, these images display the rainfall in categories. The categories were set based on the natural breaks in the rainfall values for each extent, with the minimum and maximum values in the legend corresponding to the minimum and maximum values shown in the map extent. The categories were set independently for inches and millimeters, so the two sets will differ slightly.

 

 

Files for download:

CoverageInchesMillimeters
State StateMapTIFs_inches.zip StateMapTIFs_mm.zip
Hawai‘i HawaiiMapTIFs_inches.zip HawaiiMapTIFs_mm.zip
Kaua‘i KauaiMapTIFs_inches.zip KauaiMapTIFs_mm.zip
Maui Nui MauiNuiMapTIFs_inches.zip MauiNuiMapTIFs_mm.zip
O‘ahu OahuMapTIFs_inches.zip OahuMapTIFs_mm.zip

GIS Layers

GIS layers of the rainfall isohyets, rainfall grids, raingage stations, and uncertainty have been made available for download. Users can download the isohyets and stations as shapefiles, and the rainfall and uncertainty grids have been made available in ESRI and ASCII grid formats. These are available in either inches or millimeters, and each compressed *.zip file contains all 12 months plus the annual map. Rainfall isohyets and grids are available for the entire state or users can choose to download individual islands (Maui Nui includes the islands of Maui, Moloka‘i, Lāna‘i and Kaho‘olawe). Two station shapefiles are available (the same station information used in the interactive map), and the uncertainty grids are only available at the statewide extent. All files use geographic coordinates, WGS84 datum.

For more information about GIS, how to use GIS layers, or to obtain more Hawai‘i layers, please refer to the Hawai‘i State GIS page, http://www.state.hi.us/dbedt/gis/download.htm.  After downloading, users can upload layers to ArcGIS Online to make their own maps as an alternative to using a desktop GIS program, http://www.arcgis.com/home/.

 

Rainfall Grids:

Raster files are available at 250m resolution (0.00225 x 0.00225 cell size) for each island and for the state. These are available in inches or millimeters, and can be downloaded in ESRI grid format or ASCII grid format. These are the main output of this project, with the isohyets and other products being produced from these grids.

ESRI Grid Format:

CoverageInchesMillimeters
State StateRFGrids_inches.zip StateRFGrids_mm.zip
Hawai‘i HawaiiRFGrids_inches.zip HawaiiRFGrids_mm.zip
Kaua‘i KauaiRFGrids_inches.zip KauaiRFGrids_mm.zip
Maui Nui MauiNuiRFGrids_inches.zip MauiNuiRFGrids_mm.zip
O‘ahu OahuRFGrids_inches.zip OahuRFGrids_mm.zip
Maui MauiRFGrids_inches.zip MauiRFGrids_mm.zip
Lāna‘i LanaiRFGrids_inches.zip LanaiRFGrids_mm.zip
Moloka‘i MolokaiRFGrids_inches.zip MolokaiRFGrids_mm.zip

 

ASCII Grid Format:

CoverageInchesMillimeters
State StateASCIIGrids_inches.zip StateASCIIGrids_mm.zip
Hawai‘i HawaiiASCIIGrids_inches.zip HawaiiASCIIGrids_mm.zip
Kaua‘i KauaiASCIIGrids_inches.zip KauaiASCIIGrids_mm.zip
Maui Nui MauiNuiASCIIGrids_inches.zip MauiNuiASCIIGrids_mm.zip
O‘ahu OahuASCIIGrids_inches.zip OahuASCIIGrids_mm.zip
Maui MauiASCIIGrids_inches.zip MauiASCIIGrids_mm.zip
Lāna‘i LanaiASCIIGrids_inches.zip LanaiASCIIGrids_mm.zip
Moloka‘i MolokaiASCIIGrids_inches.zip MolokaiASCIIGrids_mm.zip

 

Rainfall Isohyets:

Rainfall isohyet files are available as polyline shapefiles for each island and for the state. These are available in inches or millimeters, and the "Contour" column in the attribute table contains the isohyet labels. Both sets of isohyets (inches and mm) were created at appropriate intervals for their units, and therefore are not direct conversions of each other, though they are derived from the same data.

 

CoverageInchesMillimeters
State StateIsohyetsSHP_inches.zip StateIsohyetsSHP_mm.zip
Hawai‘i HawaiiIsohyetsSHP_inches.zip HawaiiIsohyetsSHP_mm.zip
Kaua‘i KauaiIsohyetsSHP_inches.zip KauaiIsohyetsSHP_mm.zip
Maui Nui MauiNuiIsohyetsSHP_inches.zip MauiNuiIsohyetsSHP_mm.zip
O‘ahu OahuIsohyetsSHP_inches.zip OahuIsohyetsSHP_mm.zip
Maui MauiIsohyetsSHP_inches.zip MauiIsohyetsSHP_mm.zip
Lāna‘i LanaiIsohyetsSHP_inches.zip LanaiIsohyetsSHP_mm.zip
Moloka‘i MolokaiIsohyetsSHP_inches.zip MolokaiIsohyetsSHP_mm.zip

 

Raingage Stations:

Two point shapefiles containing station information are available for download. "RFAtlasStations" refers to the stations used to create the final rainfall atlas maps. "OtherStations" refers to all other stations that have operated in Hawai‘i, but for various reasons could not be included in the final analysis. The data available in the attribute table can also be downloaded as a *.csv or Microsoft Excel *.xslx file (see Tabular Downloads). 

 

CoverageShapefileMetadata
State RFAtlasStationsSHP.zip RFAtlasStations_Metadata
State OtherStationsSHP.zip OtherStations_Metadata

 

Uncertainty:

The uncertainty grids are available at 250m resolution (0.00225 x 0.00225 cell size) for the state. These are available in inches or millimeters, and can be downloaded in ESRI grid format or ASCII grid format. These layers contain the combined standard error from all input sources to the final maps - see Methods for more information.

 

ESRI Grid Format:

CoverageInchesMillimeters
State UncertaintyGrids_inches.zip UncertaintyGrids_mm.zip

 

ASCII Grid Format:

CoverageInchesMillimeters
State UncertaintyASCIIGrids_inches.zip UncertaintyASCIIGrids_mm.zip

Google Earth Files

The same files seen in the interactive map have also been converted into *.KML (*.KMZ) files which can be viewed in Google Earth. The stations and isohyets (lines of equal rainfall) will display their attribute information when an element is clicked on in Google Earth. The color rainfall maps do not contain the value information as they do on the interactive site, so the best way to view these in Google Earth is to set the transparency to overlay it onto the imagery. Maui Nui includes the islands of Maui, Moloka‘i, Lāna‘i and Kaho‘olawe.

 

Google Earth

 

Station Legend

 


The StationsKML.zip file contains two station files: "RFAtlas Stations" refers to the stations used to create the final rainfall atlas maps. "Other Stations" refers to all the other stations that have operated in Hawai‘i, but for various reasons could not be included in the final analysis. Click on a station for more information. The symbols are set automatically for these stations to be the same as on the interactive map:

 

 

The isohyet KMLs are available in inches or millimeters, with "Contour" referring to the isohyet label when you click on a line (labels will not be displayed unless you click on a line). Both sets of isohyets (inches and mm) were created at appropriate intervals for their units, and therefore are not direct conversions of each other, though they are derived from the same data.

 

CoverageInchesMillimeters
State IsohyetsKML_inches.zip IsohyetsKML_mm.zip

 

Color Map KMLs are available by island: (use transparency in Google Earth for best viewing, as no legend is available at this time for these layers):

 

Tabular

Raingage station data is available in *.csv (comma separated values) format as well as Microsoft Excel *.xlsx format.  The mean monthly data are available only for the stations used in the Rainfall Atlas (RFAtlas Stations).  The station information for all other stations is available as well (referred to as "Other Stations").  The monthly data is available in three different formats: Processed original data (data that has been screened for outliers and inhomogeneities), Filled Dataset (processed original data plus filled data from 1920-2007, used to create the rainfall atlas means), and Raw Original Monthly Data (the original data before removing inhomogeneities and other suspicious records).  All data files contain mm and inches.

An "About" tab has been included with each of these files to further explain the contents.  For details about the processing or gap filling, please read the final report, available for download below the tabular files.

 

Excel 2007 Format
CSV Format
Mean Rainfall Data - RFAtlas Stations Mean Rainfall Data - RFAtlas Stations
Station Information - Other Stations Station Information - Other Stations
Processed Original Monthly Data Processed Original Monthly Data
Filled Monthly Dataset, 1920-2007
Filled Monthly Dataset, 1920-2007
Raw Original Monthly Data Raw Original Monthly Data

Report

Rainfall Atlas of Hawai‘i 2011 - Final Report

 

Conditions of Use

All maps, data, graphs, and narrative material available on this web site are subject to the following conditions.

Images. All color and isohyet rainfall map images presented here are available for reproduction and distribution. The map source must be included in any reproduction.

Gridded Map and Tabular Data. All gridded and tabular data and all other data presented here are available for reproduction and distribution for non-commercial use. The data source must be prominently stated whenever presenting these data in any form or any product derived in whole or part from these data.

Crediting the Source. 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. Delparte, 2013: Online Rainfall Atlas of Hawai‘i. Bull. Amer. Meteor. Soc. 94, 313-316, doi: 10.1175/BAMS-D-11-00228.1.

Sponsors of the 2011 Rainfall Atlas of Hawaiʻi. The 2011 Rainfall Atlas of Hawai‘i was developed under an agreement between the State of Hawaiʻi Commission on Water Resource Management and the U.S. Army Corps of Engineers, Honolulu District under Section 22 of the Water Resources Development Act of 1974.

No Warranty. We have made every effort to make all images, maps, graphs, data, and other information provided on this web site accurate and error-free. However, we do not guarantee the accuracy of any images, maps, graphs, data, or other information. All content is provided without warranty of any kind.