226 Meteorological Observations, 



Monthly average, Thermom. 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, 80°.35 29.85 



" at 10 P. M. 69°. 58 29.84 



Monthly average, 73°.74 29.87 



Maximum, 87°. ♦ 30.17 



Minimum, 53°. 29.53 



Range, 34°. .64 

 Warmest day, (23d) 80°1. Coldest day, (11th) 61° 



Proportion of clear weather, 20 days. 



" of cloudy " 11 " 



Whole days clear, 16 " 



Days on which rain fell, 13 " 



Depth of rain, 12.07 Inches. 



Northerly winds prevailed, 9 days. 



Easterly « " 6 



Southerly, (S. to W.) 16 



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 



