Table 3

Thermal climate classification
*Tropics*
All months with monthly mean temperatures, corrected to sea level, above 18° C
*Subtropics*	*Subtropics Summer Rainfall*
One or more months with monthly mean temperatures, corrected to sea level, below 18 C but above 5 °C	Northern hemisphere: rainfall in April-September rainfall in October-March Southern hemisphere: rainfall in October-March rainfall in April-September
	*Subtropics Winter Rainfall*
	Northern hemisphere: rainfall in October-March rainfall in April-September Southern hemisphere: rainfall in April-September rainfall in October-March
*Temperate*	*Oceanic Temperate*
At least one month with monthly mean temperatures, corrected to sea level, below 5° C and four or more months above 10° C	Seasonality less than 20^°C*
	*Sub-continental Temperate*
	Seasonality 20-35° C*
	Continental Temperate
	Seasonality more than 35° C*
*Boreal*	*Oceanic Boreal*
At least one month with monthly mean temperatures, corrected to sea level, below 5° C and more than one but less than four months above 10° C	Seasonality less than 20° C*
	*Sub-continental Boreal*
	Seasonality 20-35° C*
	*Continental Boreal*
	Seasonality more than 35° C*
*Polar/Arctic*
All months with monthly mean temperatures, corrected to sea level, below 10° C

* Seasonality refers to the difference in mean temperature of the warmest and coldest month, respectively.