Anne Arundel county . rportion of the past 85 years, have been summarized in the accompanyingtables, while the history of the past 20 years is presented in much greaterdetail. The average values of the weather elements and the daily and monthlyvariations are thus based upon observations covering a sufficiently longperiod to warrant their acceptance as true normal values for the areasrepresented. A detailed analysis of the tables seems unnecessary, in viewof the fact that all of the important deductions concerning the climaticconstants and variations are clearly indicated in the tables themselv
Anne Arundel county . rportion of the past 85 years, have been summarized in the accompanyingtables, while the history of the past 20 years is presented in much greaterdetail. The average values of the weather elements and the daily and monthlyvariations are thus based upon observations covering a sufficiently longperiod to warrant their acceptance as true normal values for the areasrepresented. A detailed analysis of the tables seems unnecessary, in viewof the fact that all of the important deductions concerning the climaticconstants and variations are clearly indicated in the tables themselves, 176 The Climate of Anne Arundel County and are more readily comprehended and more compactly presented intabular form. The Temperature The topography of the county presents very little contrast, only a fewpoints exceeding an elevation of 200 feet above sea-level; consequentlythe temperature variations are those due to latitude and the distributionof land and water. The influence of the Bay, while considerable along. Fig. 1.—Map of Maryland showing average annual temperature. the immediate shore-line, does not extend far inland in Anne ArundelCounty, particularly as the prevailing winds of the greater portion of theyear are from the west. That the presence of the Bay has a decidedinfluence, however, in the vicinity of the shores, is clearly seen by anexamination of Fig. 3, showing the length of the period of safe plantgrowth throughout the states of Maryland and Delaware. The temper-ing influence of a large body of water is also revealed in Fig. 1, showingthe distribution of the mean annual temperature in Maryland. Thegreater portion of the area comprising the Bay and the bordering countieslies between the annual isotherms of 56° and 57°. while to the north Maryland Geological Survey 177 and west of the Bay the isotherms are more numerous, showing a muchgreater variation in temperature within equal areas. The Period of Safe Plant Growth Anne Arundel County shares with the
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