10.48364/ISIMIP.196458.1 Matthias Büchner Matthias Büchner 0000-0002-1382-7424 Matthias Mengel Matthias Mengel 0000-0001-6724-9685 Yi-Ling Hwong Yi-Ling Hwong 0000-0001-9281-3479 Edward Byers Edward Byers 0000-0003-0349-5742 Mia Werning Mia Werning 0000-0002-8684-9608 Yann Quilcaille Yann Quilcaille 0000-0002-1474-0144 ISIMIP Repository 2026 Matthias Büchner Matthias Büchner 0000-0002-1382-7424 Jochen Klar Jochen Klar 0000-0002-5883-4273 Lisa Novak Lisa Novak 0009-0003-5086-1079 Stefanie Heinicke Stefanie Heinicke 0000-0003-0222-5281 Matthias Mengel Matthias Mengel 0000-0001-6724-9685 Christian Otto Christian Otto 0000-0001-5500-6774 Franziska Piontek Franziska Piontek 0000-0003-4305-7552 Dánnell Quesada-Chacón Dánnell Quesada-Chacón 0000-0001-5700-1846 Christopher P.O. Reyer Christopher P.O. Reyer 0000-0003-1067-1492 Inga Sauer Inga Sauer 0000-0002-9302-2131 Jacob Schewe Jacob Schewe 0000-0001-9455-4159 Jan Volkholz Jan Volkholz 0000-0002-2533-3739 Martin Park Martin Park 0000-0002-2467-3256 Katja Frieler Katja Frieler 0000-0003-4869-3013 Potsdam Institute for Climate Impact Research (PIK) 03e8s1d88 2026-02-06 en Derived input dataset https://www.isimip.org https://doi.org/10.5194/essd-15-2153-2023 https://doi.org/10.48364/ISIMIP.842396.1 https://gitlab.pik-potsdam.de/ISIMIP/climate-extremes-indicators-sparccle https://github.com/yquilcaille/FWI_CMIP6 https://doi.org/10.48364/ISIMIP.196458 1.1 CC0 1.0 Universal Public Domain Dedication All indicators are derived from the daily bias-corrected climate data of the ISIMIP3b input datasets and are organized into two groups. The first five are directly calculated from daily mean and maximum 2 m air temperature and daily precipitation, respectively. The remaining four indicators are derived from the Canadian Forest Fire Weather Index (FWI), produced by Yi-Ling Hwong (IIASA) and kindly provided to PIK. Currently, the FWI-based indicators cover only the historical period from 1974 onwards and the baseline period for two of these FWI-based indicators is set to 1974–2004. In a future update, we plan to extend the historical time series back to 1851 and apply 1851–1900 as the baseline consistently for all indicators. All data is reduced by masking the marine areas. Detailed descriptions of all indicators are provided below, where each list item corresponds to the variable name used in the dataset.<br>⚫︎ temp-annual-max (TXx): Annual maximum temperature<br>⚫︎ temp-variability (TV): Temperature Variability<br>⚫︎ pr-annual-max (Rx1day): Maximum over the year of the 1-day precipitations<br>⚫︎ pr-extreme-99-9: Extreme Daily Precipitation Annual Sum (above 99.9th percentile of baseline period daily data)<br>⚫︎ pr-wetdays-gt1mm (W): Number of wet days > 1mm precipitation<br>⚫︎ fwi (FWI): Canadian Fire Weather Index (FWI)<br>⚫︎ fwi-annual-max (FWIXx): Maximum of the daily FWI over the year<br>⚫︎ fwi-ndays-extreme (FWIxd): Number of days with extreme fire weather above 95th percentile of 1974-2004 baseline<br>⚫︎ fwi-avg-seasonal (FWISA): Annual Maximum of Seasonal Average of Fire Weather Index (90 days running mean)<br>⚫︎ fwi-season-length (FWILS): Number of days for which the FWI is above the mean of minimum and maximum of the FWI over the reference period 1974-2004 for this single ensemble member<br>These datasets have been created within the SPARCCLE project framwork as Deliverable D2.1 (https://sparccle.eu/).<br>Version 1.1. of this dataset extends all four FWI-based indicators to span the period from 1851 to 2100. The two FWI-based indicators, which were previously calculated relative to the base period of 1974–2004, now reflect the change relative to the base period of 1851–1900. In addition, the underlying daily FWI data itself have been included. global -179.5 179.5 -89.5 89.5