Table 4

Variables considered for the summer and winter periods
Variable	Definition	Unit	Scale

Tmax max	Maximum of daily maximum temperatures for the period of April 1^stto October 31^st	°C	Year
Tmin max	Maximum of daily minimum temperatures for the period of April 1^stto October 31^st	°C	Year
Tave max	Maximum of daily mean temperatures for the period of April 1^stto October 31^st	°C	Year
Tave min	Minimum of daily mean temperature for the period of November 1^stto March 31^st	°C	Year
Ptot	Cumulated total precipitations for the period of April 1^stto October 31^st	mm	Year
DD18	Cumulated degree-days at threshold of 18°C for the period of April 1^stto October 31^st	°C	Year
DD20	Cumulated degree-days at threshold of 20°C for the period of April 1^stto October 31^st	°C	Year
DD25	Cumulated degree-days at threshold of 25°C for the period of April 1^stto October 31^st	°C	Year
DD-5	Cumulated degree-days at threshold of -5°C for the period of November 1^stto March 31^st	°C	Year

El Adlouni et al. International Journal of Health Geographics 2007 6:40 doi:10.1186/1476-072X-6-40