ABSTRACT
In the two preceding chapters, the general structure of the circulation and air-mass characteristics in middle latitudes have been outlined and the behaviour and origin of extratropical depressions examined. The direct contribution of pressure systems to the daily and seasonal variability of weather in the westerly wind belt is quite apparent to inhabitants of the temperate lands. Nevertheless, there are equally prominent contrasts of regional climate in mid-latitudes that reflect the interaction of geographical and meteorological factors. This chapter gives a selective synthesis of weather and climate in several extratropical regions, drawing mainly on the principles already presented. The climatic conditions of the polar and subtropical margins of the westerly wind belt and the polar regions themselves are examined in the final sections of the chapter. As far as possible, different themes are used to illustrate some of the more significant aspects of the climate in each area.
