EXPLANATIOIT OP OCEAN TEMPERATURE CHART No. 23. 



MATINICUS EOCK LIGHT-HOUSE, MAINE. 

 Olset-ver: William G. Grant. 



Location of station — Matinious Kock is a bare, rocky islet, about 80 miles easterly from Seguin Island, and about 

 14 miles south of Vinal Haven Island, at the month of Penobscot Bay, the nearest large piece of land. It is about 2| 

 miles SE. of Ragged Island, which is close to Matinicus Island and between the latter and Matiniens Rock. Within 

 a radius of a mile the water deepens rapidly from 4 to 45 fathoms. 



Geographical position.— JjatitTiie, 43° 47' 01" N.; longitude, 68° 51' 20" W. 



Depth of water. — Six to 12 fathoms. 



Bange of temperature (March 1 to January 1).— Air, 42° (23° to 65°); surface, 21°.5 (32°.5 to 54°). 



Matinicus Rock and Mount Desert Rock present the shortest range of surface temperature of any of the stations 

 north of the Florida Reefs, being 7° shorter than at Nantucket New South Shoal light-ship. The surface and air 

 maximums for Matinicus Rock are also the lowest of any recorded. The surface curves are very regular, and 

 uniform from year to year. Unfortunately, there are nearly as many omissions in the surface records for this station 

 as for Boon Island, but they are seldom frequent except during the colder months. * 



Table showing the direction of the winds, iy quadrants, for each month of the year, icing the means of five years' obsci-vations. 



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