From Western Australia Government
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State Climate Projections 20km - Rainfall bias corrected (DWER-142)

Created 20/12/2025

Updated 20/12/2025

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The Climate Science Initiative (CSI) State rainfall projection 20km bias corrected dataset has been produced as part of the Climate Science Initiative program.

Climate projection data is available at a 20-kilometre resolution representing the monthly average of precipitation (mm/day) daily average rainfall for annual and seasonal time slices (Summer, Autumn, Winter, Spring) over the 5 time periods:

• Baseline (1990-2009)

• 2030 (2020-2039)

• 2050 (2040-2059)

• 2070 (2060-2079)

• 2090 (2080-2099)

Projections represent two emissions scenarios, SSP1-2.6 (a ‘low’ emissions scenario) and SSP3-7.0 (a ‘high’ emissions scenario). The results are presented as a mean, minimum and maximum result of the NSW and Australian Regional Climate Modelling (NARCliM) ensemble (representing 10 Global Climate Model results) for each gridded point, as well as a standard deviation to reveal the statistical range between model results.

Relative change files (difference between the future and baseline prediction) are also available for each of the calculations i.e. annual and seasonal mean, standard deviation, minimum, maximum. The data is bias corrected, and users are encouraged to read the CSI technical fact sheet for further information on this, and data limitations. It also includes background information on the project and datasets, explanations of technical terms such as Global Climate Models (GCMs), Shared Socioeconomic Pathways (SSPs) and further information about the projections. It also contains important advice regarding using the data appropriately.

Future updates to this dataset may include regional and global climate model specific data at a 4-kilometre resolution, as well as a third ‘middle of the road’ scenario (SSP2-4.5).

The data naming protocol is outlined in the technical information factsheet available under Data and Resources.

• Frequently asked questions - https://www.wa.gov.au/service/environment/environment-information-services/climate-science-initiative-frequently-asked-questions

• Climate Science Initiative - https://www.wa.gov.au/organisation/department-of-water-and-environmental-regulation/climate-science-initiative

Files and APIs

Tags

Additional Info

Field Value
Title State Climate Projections 20km - Rainfall bias corrected (DWER-142)
Language English
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/ee2875f7-e2e3-4dcf-b3fc-f1def464afb2
Remote Last Updated 17/12/2025
Contact Point
Department of Water and Environmental Regulation
spatial.data@dwer.wa.gov.au
Reference Period 09/07/2025
Geospatial Coverage
Map data © OpenStreetMap contributors
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  "type": "Polygon"
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Data Portal Western Australia Government

Data Source

This dataset was originally found on Western Australia Government "State Climate Projections 20km - Rainfall bias corrected (DWER-142)". Please visit the source to access the original metadata of the dataset:
https://catalogue.data.wa.gov.au/dataset/state-climate-projections-20km-rainfall-bias-corrected