How should one compare the comfort of climates?
One measure that could be used is the apparent temperature, which combines air temperature, humidity and wind speed to derive the temperature that the human body feels. It is sometimes referred to as the "feels like" temperature or the Steadman temperature, after Robert Steadman who proposed the idea in 1971. 

The formula used by the National Oceanic and Atmospheric Agency, for calculating the apparent temperature is:

 AT = -2.7 + 1.04*T + 2.0*e -0.65*v


where AT and T (air temperature) are °C, e is vapor pressure in kPa,
and v is 10m wind speed in m/sec. 

Most weather oraganizations include the calculated apparent temperature in their weather reports.