METEOROLOGICAL. 175 



3. That there is a constant dilference in the observations 

 taken in the morning and afternoon, averaging for the whole 

 period a decrease of 0.05 height in the afternoon. 



4. Tliat the difference between the average of maximum and 

 minimum observations in the ten years has fluctuated between 

 0.25 and 0.46. 



Thermometer. 1. That the four months, June to Septem- 

 ber, are the hottest, and of nearly equal temperature, viz. ; 88°. 



2. That January, February and March are the three coldest 

 months, and of nearly equal temperature, viz. : 6(5°. 



3. That the greatest maximum heat exceeds the average heat 

 by not more than 12°, and that the greatest mimimum falls short 

 of it 10°. The extreme variation, therefore, is 22°. 



Rainfall. 1. That tlie chief yearly rainfall is from May to 

 October, and is heaviest in October. During these six months 

 it amounted to forty-four inclies, and during the remaining six 

 months to nineteen inches; and that the greatest rainfall does 

 not correspond with the greatest pressure of wind. 



Wind. 1. That the highest winds prevail in November and 

 January, and the average from Octol^er 1st, March inclusive, 

 greatly exceeds the average of the remaining six months, and 

 that there is little difference between morning and afternoon. 



2. That north-easterly and easterly winds are the most preva- 

 lent from September to February, during which months they 

 blow during one-half or two-thirds of the whole time. North- 

 erly winds seldom blow except during those months, and then 

 only for three days in a month. From June to August, the 

 average is less than a day. Easterly and south-easterly winds 

 prevail chiefly from March to August. South-western are most 

 prevalent in February and March, to the extent of two to three 

 days in a month; westerly winds from February to April to the 

 extent only of one to one and a-half days in a month, and dur- 



