. A regional geography of the world, with diagrams and entirely new maps . January isottte %$ .Ju// Isochems Fig. 48.—Europe : January and July mean sea-level isotherms. Climate. Tempcrnturc Conditums. Lig. 48 gives the mean aca-Icvel isotherms for January ancl July. The isotherm of32° F. should be particularly noted, for that is thetemperature at which water freezes. Its path clearlydemonstrates the influence of the warm waters of theNorth Atlantic drift, and of the warm south-west winds GENERAL PHYSICAL CONDITIONS i6i which blow from ocean to land. As in the case ofl^ritain, winter temperatu
. A regional geography of the world, with diagrams and entirely new maps . January isottte %$ .Ju// Isochems Fig. 48.—Europe : January and July mean sea-level isotherms. Climate. Tempcrnturc Conditums. Lig. 48 gives the mean aca-Icvel isotherms for January ancl July. The isotherm of32° F. should be particularly noted, for that is thetemperature at which water freezes. Its path clearlydemonstrates the influence of the warm waters of theNorth Atlantic drift, and of the warm south-west winds GENERAL PHYSICAL CONDITIONS i6i which blow from ocean to land. As in the case ofl^ritain, winter temperatures fall as we go eastwardsaway from the warm ocean. In July, the :hly run from west to east, but there is a markednortherly trend the further east they go, due to the factthat in this month the land masses are warmer than theseas in the same latitude. In January, only the extreme. lesz tfi»n 20 Inches30 , TmI M>pr. C* Lt L«MM« Fig. 49.—Europe : Mean annual rainfall. south has a mean monthly temperature exceeding 50^ F.;in July, only in the extreme north does the temperaturefall below this amount. Considering the January andJuly isotherms together, it is evident that in bothmonths the warmest temperatures are experiencedin the Mediterranean region, that the least range oftemperature is found along the western margins, andthe greatest range in the east and particularly thenorth-east. M i62 EUROPE Rainfall Conditions.—If the mean annual rainfall map(Fig. 49) is compared with a relief map, the close con-nection between the two sets of factors is at onceapparent. The rain-bringing winds are the prevailingwesterlies, hence the decrease of rainfall as we go east-wards. The effect of an encircling chain of highlandsis also markedly illustrated in the case of the relativelydry Hungarian plains. As regards the seasonal distribution of rainfall,Europe may b
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectgeography, bookyear19
