Table 1. Fire indices used in this study and related input variables, meteorological data and site parameters used for calculations.

Fire indices	Acronym	Daily meteorological data							Other meteorological data		Site parameters		single indices for comparison (*)	References
		T	Tmax	Tmin	Tdew	H	P	U	Mean monthly T	Mean annual sum of P	Elevation	Latitude
Angström index	Angstroem	[°C]				[%]							x	[67]
Baumgartner index	Baumgartner	[°C]	[°C]	[°C]			[mm]	[m/s]			[m a.s.l.]	[rad]		[68]
Fine fuel moisture code	FFMC	[°C]				[%]	[mm]	[km/h]					x	[15]
Duff moisture code	DMC	[°C]				[%]	[mm]						x	[15]
Drought code	DC	[°C]					[mm]						x	[15]
Initial spread index	ISI	[°C]				[%]	[mm]	[km/h]						[15]
Buildup index	BUI	[°C]				[%]	[mm]							[15]
Fire weather index	FWI	[°C]				[%]	[mm]	[km/h]					x	[15]
Fosberg fire weather index	FFWI	[°C]				[%]		[mph]						[69]
Keetch-Byram drought index	KBDIsi	[°C]					[mm]			[mm]			x	[70]
Mc Arthur Mark 5 forest fire danger index	FFDI	[°C]				[%]	[mm]	[km/h]		[mm]				[71]
Munger drought index	Munger						[in]							[72]
Orieux index (danger scale)	Orieuxdanger	[°C]					[mm]	[km/h]	[°C]			[rad]		[73]
Nesterov ignition index	Nesterov	[°C]			[°C]		[mm]						x	[74]
Sharples fuel moisture index	FMI	[°C]				[%]							x	[75]

When a variable is retained, the units are in square brackets.

(*) single indices used as input for logistic models for the comparison with the best Maxent models (see Fig. 4 and Table 4).