226 Meteorological Observations. 



Monthly average, lliermom. 71°. 93 Barom. 29.86 inches. 

 Maximum, 88°. 30.10 " 



Minimum, 47°. 29.67 " 



Range, 41°. .43 " 



Warmest day, (2nd) 79°. Coldest day, (24th) 57°. 

 Proportion of clear weather, 17 days. 



" of cloudy " 13 " 



Whole days clear, 14 " 



Days on which rain fell, 7 " 



Depth of rain, 2 inches. 



Northerly winds prevailed, 6 days. 



Easterly » « 10 " 



Southerly, (S. to W.) 14 " 



An aurora, on the 10th, followed by changeable weather, and 

 easterly winds ; a dry month ; very warm at the commencement, 

 then cool, warm again in the middle, and again cool in the lat- 

 ter part ; winds light and variable ; clouds electrified in the lat- 

 ter half of the month; no easterly storms. 



Meteorological Summary, for July, 1831. 

 Average at sun-rise, Thermom. 67°.13 Barom. 29.89 inches. 



" at mid-day, 



" at 10 P. M. 

 Monthly average, 

 Maximum, 

 Minimum, 

 Range, 



Warmest day, (23d) 80°^. 

 Proportion of clear weather, 



" of cloudy " 

 Whole days clear, 

 Days on which rain fell, 

 Depth of rain. 

 Northerly winds prevailed, 

 Easterly " " 



Southerly, (S. to W.) 



Auroras on the 4th, .5th, and 10th, followed by variable wea- 

 ther, and that on the 10th by easterly winds. A very brilliant 

 one was seen in Massachusetts, on the 31st, but was not visible 

 at Wilmington. A very wet month ; rains heavy ; nine inches 



