New York Weather Bureau. 451 



tlie lowest temiperature is not readied until the time of sunrise in 

 winter^ owing to the later hour at which the rays of the sun pene- 

 trate into the valley. 



Obseryations have recently been made within this State at a few 

 stations located on hill or mountain tops^ whose results as regards 

 daily amplitude of temperature it would be of interest to compare 

 with the foregoing. The records do not, however, much exceed 

 a year in length, and hence can not give even approximately correct 

 values of daily variations. The mean daily ranges are given here- 

 with (page 452) for three of these stations, in connection with the 

 values for the isame months at points in adjacent valleys. These 

 ranges are not^ like the above, freed from the effects of unperiodic 

 variations from day to day, and hence are much in excess of the 

 true amplitudes, the excess, however, being approximately the 

 same for the stations of each pair. 



