. A regional geography of the world, with diagrams and entirely new maps . the Azores. Theclimate of Britain is also affected by cyclonic depressions,of greater or less intensity, which usually cross thecountry from west to east and are accompanied bychangeable winds, unsettled weather and rain. On theaverage one of these cyclones reaches Britain every tenor eleven days, but they are more frequent in winterthan in summer. Less frequently the British Isles areunder the influence of high pressure or anti-cyclonicconditions, and at such^times fine weather, if by that 58 THE BRITISH ISLES term the
. A regional geography of the world, with diagrams and entirely new maps . the Azores. Theclimate of Britain is also affected by cyclonic depressions,of greater or less intensity, which usually cross thecountry from west to east and are accompanied bychangeable winds, unsettled weather and rain. On theaverage one of these cyclones reaches Britain every tenor eleven days, but they are more frequent in winterthan in summer. Less frequently the British Isles areunder the influence of high pressure or anti-cyclonicconditions, and at such^times fine weather, if by that 58 THE BRITISH ISLES term the absence of rain is meant, is usually anti-cyclones occur less frequently than cyclones, theyare more enduring. They are marked by calm weatherand an almost invariable absence of rain, and occur inwinter quite as frequently as in summer. Temperature.—Fig. 21 gives the mean January and Julysea-level isotherms. In January the temperature fallsfrom west to east and not from south to north. This isiindicated by the north and south direction of the isotherms. Fig. 21.—Mean Sea-level Isotherms. —of which that of 40° F. may be regarded as is thus clear that at this time of the year distancefrom the Equator, upon which the height of the sunthroughout the year depends, is not of such greatimportance as distance from the warm Atlantic coldest area in Ireland is the eastern part of theCentral Plain, and in Great Britain the east coast. InJuly, the isotherms take an east and west direction,showing that temperature decreases from south to southerly bends over seas and the northerly bendsover Ireland and Great Britain arc, of course, due to the GENERAL IMIYSICAL CONDITIONS 59 greater heat ol the land compared with the sea. Thewarmest part of Britain is seen to be in the south-east,which is least affected by the cooling of the great oceanto the west and at the same time receives the suns raysless obliquely than the north. The part of Britai
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectgeography, bookyear19
