Okay, here is how it goes: based on your feeling the band's weather is either cold or hot, or lukewarm. i guess ''cool'' bands are only for pop or classic rock. okay lets me example:

Metallica: lukewarm
To/die/for: cold
Swallow The Sun: cold
Slayer: hot
Dimmu Borgir: cold
Stratovarius: hot
HammerFall: hot
Cradle of Filth: hot
Immortal: cold
Gun'N'rose:hot and cool
Colosseum: cold
Wintersun: cold
Catamenia: cold
Windir: cold
Children of Bodom: cold
Iron Maiden: hot