THE GEOLOGY OF LONG ISLAND, ETC 



Elev. No. yrs. Jan. Feb. Mai. 

 220 ft. 9 4.17 3.62 4.31 



Rqslyn__ _ j 



Apr. 

 3.78 



May 

 3.70 



June 

 3.55 



July Aug 

 3.73 4.59 





Sept. 



Oct 



Nov. 



Dec. Annua 





3.78 



3.43 



2.82 



4.57 46.05 





Elev. 



No. yrs. Jan. 



Feb. Mar. 





40 ft. 



35 



4. 



3.98 4.29 



Setauket 



Apr. 

 3.74 



May 

 3.44 



June 

 2.73 



July Aug 

 4.17 4.31 





Sept. 



Oct 



Nov. 



Dec. Annua 





3.50 



4.12 



3.66 



4.03 45.97 



The principal temperature records are from Setauket 

 where the station is located on a neck of land that projects 

 into the estuaries of Long Island Sound, ground level, and 

 nearly surrounded by water. 



TEMPERATURES AT SETAUKET 



Jan. 



Mean (35 yrs.) 30.8 



Highest temp. (31 yrs.). 66 

 Lowest temp. (31 yrs.) -3 



Feb. 



Mar. 



Apr. 



May 



June July 



29.5 



37.1 



47.3 



57.9 



66.2 72 



64. 



75 



87 



91 



93 98 



-6 



7 



21 



34 



40 50 



Aug. Sept. Oct. Nov. Dec. Annual 



Mean (35 yrs.) 70.6 64.8 55 44.3 34.6 50.8 



Highest temp. (31 yrs.) 95 93 86 71 63 98 



Lowest temp. (31 yrs.) 50 37 31 16 -7 -7 



For Setauket, in 31 years, the earliest date of the last 

 killing frost in the spring is given as March 27 with the 

 latest May 17. The average date, however, is found between 

 the second and third week of April. In the fall, the date 

 of the earliest killing frost is Oct. 22nd, the latest Novem- 

 ber 29, the average occurring in the first and second weeks 

 of November. For this same point the greatest growing 

 season recorded has been 247 days, the minimum 158 days, 

 with an average of 211 days. 



—21- 



