Meteorological Journal at Marietta, Ohio, for 1843. 277 



Art. VII. -^- A bstract of a Meteorological Journal, for the year 

 1843, kept at Marietta, Ohio, Lat. 39° 25' N., Long. 4° 28' 

 W. of Washington City ; by S. P. Hildreth, M. D. 



Remarks on the year 1843. — Although there cannot, accord- 

 ing to the present arrangement of the seasons, be any very great 

 difference in the mean temperature of different years, the laws of 

 climate forbidding any wide departure from this rule ; yet from 

 various causes there is in many years a striking difference in the 

 temperature, especially as applied to the seasons. This variety 

 most generally arises from the course of the winds, and from the 

 greater or less amount of rain ; but much more from the winds 

 than from any other source. Next to the winds, the amount of 

 cloudy weather has considerable influence, by the obstruction 

 this state of the atmosphere opposes to the rays of light and heat 

 from the sun. The past year has been attended with a larger 

 amount of westerly and northerly winds than usual, and also with 

 a greater number of cloudy days. From both these sources we 

 may perhaps account for the low mean annual temperature of this 

 year, being more than two degrees less than the usual amount for 

 this climate, that of 1843 being only 50°-77; the years 1835, 

 1836 and 1838 were also remarkable for their low temperature. 



The mean for the winter months is 32° -33, which is four de- 

 grees less than that of the year 1842. The winter of 1843 set in 



