de Freitas, C.R. and Grigorieva, E.A, 2014. A comprehensive catalogue and classification of human thermal climate indices. International Journal of Biometeorology. DOI: 10.1007/s00484-014-0819-3
Dear colleague, PMV has been formulated for indoor environments provided with HVAC system (Fanger, 1970; Parsons, 2003) , although someone (also national standardization organizations) uses it also outdoor.
Review by De Freitas is very very good.
I suggest you UTCI (http://www.utci.org) formulated on a robust scientific background.
For further details there is a special issue of the International Journal of Biometeorology devoted to the matter.