470 Eighth Annual Keport of the 



valleys very favorable to the occurrence o<f low uocturnal tem- 

 peratures, and hence the dates at these stations may be consid- 

 ered to represent nearly, or quite, the earliest occurrence of frost 

 in the central plateau region. Waverly, on the other hand, is 

 situated in a very broad depression where, as has already been 

 seen, the effect of nocturnal cooling is much less marked. 



Mr. A. K. Harrison of New Lebanon, in N. E. Columbia county, 

 states: " We often have frosts in August, and a few years ago (in 

 1889 or 1890) there was frost during every month excepting 

 July." The diata furnished^ although mot sufficient to establisih 

 an average, makes it apparent that frosts occur earlier in the 

 eastern highlands than in the main poTtion of the Central 

 Plateau. 



Northern New York. — In commenting on the dates of autumnal 

 froists at North Hammond, in the St. Lawi-enee valley, Mr. C. A. 

 Wooister states that their late occurrence (as given in the table), 

 is in pairt due to close proximity to the St. Lawrence River, two 

 miles wide at that point, as well a® to several other local condi- 

 tions. At Hammond, six miles from the river, frosts occur some- 

 what earlier. 



iSo far as can be learned, frosts occur in the sioiuthern portion 

 of the Adirondack region proper about three weeks earlier than 

 in the Mohawk valley. Mr. C. A. McCoy of Sageville, who fur- 

 nished this estimate a® the result of many yeajrs of observation, 

 places the average date of the last killing frosts of spring 

 between May 2oth and June 5th, and that of the first of autumn 

 between September 1st and 15th. 



In the( mountainous section of the northeastern Adirondacks 

 ifihe last frost of spring occurs near the close of May and the 

 first of autumn about September 20th, as stated by Mr. J. H. 

 Bailey of Keene Valley, Essex county. 



