New York Weather Bureau. 445 



area in the vicinity. The distribution of temperature at the 

 remaining stations, land especially at Canton, Lyon Mountain and 

 Plattsburgh, is such as would be due to a rather rapid gain of 

 warmth with increased elevation in the mass of the cold wave 

 itself. Evidently, no very frequent recurrence of such a condi- 

 tion would be required to equalize the average monthly tempera- 

 ture of the valleys and highlands. 



So far, then, as present records show, the whole of northern 

 New York has substantially the same average winter tempera- 

 ture, excepting as certain deep valleys are subject to a local cool- 

 ing through an accumulation of the colder and denser air. In 

 summer the warmth of the highlands decreases at about 0.3 de- 

 grees per hundred feet of elevation above sea level; and the av- 

 erage temperature of the Adirondiack region at that season is thus^ 

 reduced to nearly the siame value which obtains o^ the sea coast 

 of northern Maine; the days, however, being warmer and the 

 nights cooler than in the coast region. 



The New England Green Mountains. — A third highland region 

 of the State is that belonging to the system of the Green Moun- 

 tains of New England, and extending over the New York border 

 in Eensselaeir, (Columbia and northern Dutchess counties. The 

 climate here appears to be colder than in the highlands of eentral 

 New York at the same latitude, but no definite statements can 

 be made, as ^observations representing this section are lacking at 

 present. Some data which have been obtained upon frosts will 

 be found on page 470. 



