EXPLANATION OP OCEAN TEMPERATURE CHART No. 24. . 



MOUNT DESERT KOCK LIGHT-HOUSE, MAINE. 

 Observers : Amos B. Newman, James A. Morris, Thomas Milan. 



Location of station. — Mount Desert Eock is a small, barren islet, 34 miles E. f N. from Matiuicus Eock, and 

 abont 18 miles off Mount Desert Island. The rock is surrounded with deep water, the depths ranging from 50 to 95 

 fathoms within a radius of 5 miles. 



Geographical ;)os»ion.— Latitude, 43° 58' Oy N. ; longitude, G8° 07' 44" AV. 



Depth of neater. — Two to 10 fathoms. 



Range of temperature (March 1 to January 1). — Air, 50° (25°. r> to 75°. 5) ; surface, 21°.5 (^3° to 54°. 5). 



This station presents the same surface range as Matinicus Eock, with practically the same maximum and mini- 

 mum temperatures, but the surface curves are less regular and not uniform for all the years (especi.ally from 1881 to 

 l^iSS, inclusive), sometimes showing differences of 10° to 12° in corresponding periods. The maximum air tempera- 

 (■xire is 2° higher than at any other station in the Gulf of Maiue, excepting Thatcher's Island, Brenton's Eeef light- 

 shii) being the first st.ition to the south with which it corresponds closely in this respect. The maximum air tem- 

 perature at Matinicus Eock, the nearest station to the west, is 10° loarer than at Mount Desert Eock. Excluding, 

 however, the year 1883, in which the summer temperature was far above those of the two previous years, the maxi- 

 mum air temperature of this station would be only 68°. 5. 



Table showing the direction of the winds, hy quadrants, for each mouth of the year, being tht means of five years' observations. 



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