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Hawaii 1990-2019 gridded monthly rainfall mm

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Type: Resource
Storage: The size of this resource is 1.1 KB
Created: Dec 01, 2021 at 11:17 p.m.
Last updated: Dec 01, 2021 at 11:21 p.m.
DOI: 10.4211/hs.2275657d62794c2294553919fa94b68d
Citation: See how to cite this resource
Sharing Status: Published
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This dataset contains gridded monthly rainfall from 1990 to 2019 at 250 m resolution for seven of the eight main Hawaiian Islands (18.849°N, 154.668°W to 22.269°N, 159.816°W; the island of Ni‘ihau is excluded due to lack of data). The gridded data use a World Geographic Coordinate System 1984 (WGS84) and are stored as individual GeoTIFF files for each month-year, as indicated by the GeoTIFF file name. Contained in the dataset is a statewide complete 30-year partially gap filled monthly rainfall dataset for all stations for the entire date range with station names, ID and location. Also included are month year statewide files for rainfall kriging input files which contain station rainfall, station rainfall transformations, station transformed anomaly, and denotation of inclusion in per county kriging process, statewide gridded rainfall, statewide standard error, statewide gridded rainfall anomaly, statewide gridded rainfall anomaly standard errors, and statewide meta-data that contain per county as well as statewide cross validation statistics, station counts, and readable data quality statement. Monthly rainfall grids were created using an optimized geostatistical kriging approach to interpolate relative rainfall anomalies which are then combined with long-term means to develop the climatologically aided gridded estimates. Optimization of the kriging algorithm consists of: 1) determining an offset (constant) to use when log-transforming data; 2) quality controlling data prior to interpolation; 3) using machine learning to detect erroneous maps; and 4) identifying the most appropriate parametrization scheme for fitting the model used in the interpolation. At present, the data are available from 1990 to 2019, but datasets will be updated as new gridded monthly rainfall data become available. Rainfall products and error metrics are also available by county and can be accessed online for easy download through the Hawaiʻi Data Climate Portal available at

Subject Keywords



Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal Degrees
North Latitude
East Longitude
South Latitude
West Longitude


Start Date:
End Date:


‘Ike Wai:

In 2016, University of Hawai‘i launched the Hawai‘i EPSCoR ‘Ike Wai project supported by the National Science Foundation (Award # OIA-1557349) The five-year project uses integrated research, education, and community engagement efforts aimed to ensure Hawai‘i’s future water security and promote resource management within the state that is sustainable, responsible, and data-driven.

To save space on Hydroshare, all ‘Ike Wai project files are stored at the University of Hawai‘i and linked here. Please use the following link(s) to see the files for this resource.


  • Precipitation

    id: rainfall-monthly-total-mm

    category: Climate

    data type: Cumulative

    unit: millimeter(mm)

    value type: Field Observation

    description: Rainfall monthly total


Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
National Science Foundation ‘Ike Wai: Securing Hawaii’s Water Future Award OIA-1557349


People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.

Name Organization Address Phone Author Identifiers
Thomas Giambelluca

How to Cite

Lucas, M., R. Longman, T. Giambelluca, A. Frazier, J. Mclean, S. Cleveland, Y. Huang, J. Lee (2021). Hawaii 1990-2019 gridded monthly rainfall mm, HydroShare,

This resource is shared under the Creative Commons Attribution CC BY.


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