450 



Eighth Annual Report of the 



At each of the stations^ with the exception of Albany, the daily 

 amplitude Is decreased by proximity to the Great Lakes or the 

 ocean ; the effect being most marked at Buffalo, where the prevail- 

 ing winds come from the lake. The large percentage of cloudy 

 weather which obtains in the Lake Region also tends to reduce the 

 values at both Buffalo and Rochester, while New York city is less 

 affected by this cause. The absence of large bodies of water near 

 Albany, its position on the lower slopes of a broad valley, and a 

 lesiser degree of cloudiness than obtains in the Lake Region com- 

 bine to make its range larger than at the three remaining stations. 



But one determination of amplitude has been made for this State 

 in addition to the above. This is for the station Mohawk, siituated 

 in the deeper portion of the Mohawk valley^ and hence represent- 

 ing conditions somewhat different from those at any of the 

 Weather Bureau stations. The amplitudes, as given by Schott,, 

 are: 



The cloudiness is at a decided maximum in winter at Mohawk, 

 and hence the range does not then differ greatly from that of 

 Albany. The large range which obtains in summer is such as 

 would be expected to result from the rapid heating of the quiet .air 

 of the valley during the day, alternating with a downflow of chilled 

 air from the highlands at night. 



As shown by McAdie's tables^ the time of the maximum tem- 

 perature at the Weather Bureau stations does not vary substan- 

 tially from 3 p. m. during the year. At Mohawk the maximum 

 occurs, by the tables, at 4 p. m. during April^ May and June^ and 

 varies but little from 3 p. m. during the remainder of the year. 

 For the State generally, the minimum temperature may be expected 

 to occur at about the time of sunrise during the summer, and from 

 one to two hours before sunrise in winter. At Mohawk, however^ 



