150 



CLIMATE. 



four critical months, at York, with that on the sea-coast, and in 

 the midst of the elevated land of the West Riding : 



Hence it appears that the warming influence of the sea air 

 begins to be very sensible in October, and remains very marked 

 in January, but is exchanged for a cooling influence in April. 

 Invalids may probably be advised to prolong their stay on the 

 coast till January, but on no account to face the unfavourable 

 temperature of the early spring. In mountain countries the 

 masses of elevated land operate in a similar manner on the val- 

 leys which divide them, and thus warm the late autumn and 

 mitigate the extremity of winter cold. 



We may exhibit the effect of the sea air in moderating the 

 extremes of daily heat and cold, by placing in comparison the 

 temperatures of the warmest part of the day and coldest part of 

 the night at York and Keyingham. 



Temperature of the warmest part of the day. 



Temperature of the coldest part of the night. 



