Mr Marshall's Meteorological Observations, 4rc. 387 



On reviewing the phenomena of this month, it appears, that, after the 

 prevalence of winds from the W. and S. W., the thermometer has generally 

 fallen, whilst those from the N. and N. W. have been succeeded by an 

 augmentation of temperature. The maximum of the thermometer is 11* 

 less than in June of last year, when it was then higher than any other 

 month in 1826. The barometer also failed in attaining so great an altitude 

 The mean of the barometer is also less than that of June in 1 826, which 

 was 30.02. 



Juli/ 1827. 



Barometer. Inches. 



Maximum on the 6th and 7th, - - - 30.15 



Minimum on the 20tb, - - - 29.39 



Mean height, 29.79 



Thermometer. 

 Maximum on the 30th, - - - 74* 



Minimum on the 12th, - - - 42° 



Mean height, - - - - 59.01° 



Quantity of rain, 3.170 inches. 

 Number of rainy days, 15. 

 Prevalent wind, west. 

 This has been a very sultry month, though the thermometer has not 

 marked during any part of it greater heat than 74°, which was the maxi- 

 mum of last month. On the 30th we had a very heavy thunder storm, 

 though unattended with any great weight of rain. The wind has been 

 for twenty-five days in the W, and N. W. 

 August 1827. 



Barometer. Inches. 



Maximum on the 23d, - - - 30.18 



Minimum on the 15th, - - ^.10 



Mean height, - - - - 29.81 



Thermometer 

 Maximum on the 3d, - - 68' 



Minimum, on the 6th, 10th, 20th, and 23d, - 46' 



Mean Height, - - - 56.61 



Quantity of rain, 5.214 inches. 

 Number of rainy days, 12. 

 Prevalent wind, north-west. 



This month has been marked by a most unusual prevalence of winds 

 from the N. N. E. and N. W. — At this period of the year these currents 

 seldom occur, much less prevail. But .060 inch of rain has fallen since 

 the 16th ; prior to that date we had rain almost daily, and in considerable 

 quantities. — The barometer has kept high, and has been a faithful index 

 of the changes which have taken place. The temperature of the air, par- 

 ticularly in the nights, has been much greater than might have been expec- 

 ted, considering the extraordinary prevalence of the winds from the north 

 &c., from which quarters the temperature is usually low. The wind has 

 been in the N. W. twelve days, in the W- 7, N. E. 5, N. 3, S. W. 3, and 

 S. E. 1 day. 



