Meteorological Observations at Burlington, Vt. 351 
The results in the above tables are deduced from three daily 
observations made at sunrise, 1 P.M. an p.m. The warmest 
day in the year was September 10, the mean heat of which was 
which was —11°5°.. The meay temperature of the year was 
0°:37 colder than the average of the thirteen preceding years. 
the amount in 1851, was 5°68 inches less than in 1850, and 0°41 
in. less than the mean annual fall in the preceding thirteen years. 
The greatest fall of water in any one of those thirteen years, 
was in 1847, when it amounted to 38°55 inches, aud the smallest 
was in 1849, amounting only to 26°35 inches. 
The fall of snow in 1851 was 37 inches less than in 1850. 
During the year there were éighty-six days of tolerable sleighing 
in Burlington and vicinity, two days more than last year. The 
broad lake opposite to Burlington froze over on the Ist day of 
February, which was about the-usual time of closing, and con- | 
tinued closed till the 12th of March. The water of the lake 
was highest on the 16th of April, being then two feet below ex- 
treme high-water mark, aud lowest on the 13th of October, being 
7 feet 73 inches below high water—change of level of the lake 
in the year 5 feet 74 inches. The extreme change of level has 
not been. observed to exceed 8 feet. , 
The createst raiti-storm in 1851, was on the 22d and 23d of 
June, and the fall of water in those two days was 5:16 inches. 
The months of November and December were each more than 
5° colder than the average of those months, for the thirteen pre- 
ceding years. 
Robins appeared March 20, Blnebirds 22, Cowbirds and Long- 
Sparrows 26, Meadow Larks and Flycatchers April 6, White bel- 
lied Swallows 18, Barn Swallows 25, White Elm in blossom 15, 
Trailing Arbutus 12, Red Maple 19, Liverleaf and Bloodroot 24, 
Venus’ Pride 28, Gooseberries blossom May 7, Currants 9, Plums 
and Pears 15, Siberian Crab-apple 21, Common apple 24, ten days 
earlier than last year. 
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