350 Account of Meteorological Observations made in 
inclusive. The observations were made four times a-day, at 
8^ A. M.j at noon, at sunset, and at lO*' P. M. 
The following Table contains the mean monthly and annual 
results, deduced from more than 48,000 observations. 
Longitude of Salem, - 4® 43' 37" West of Greenwich. 
Latitude, 
42® 33' 30" North. 
For 33 Years. 
For 33 Years, 
January, 
25°.439 
Mean of A. M. 46®.426 
Hottest day in 
February, 
26.963 
Mean of Noon, 55.47 
33 years, 101* 
March, 
35.321 
of Sunset, 48.565 
Coldest day, — 11* 
April, 
46.108 
lO^jP.M. 44.316 
Hence the great- 
Mayj 
56.727 
est range is 112* 
June, 
67.013 
Mean of Winter, 27.502 
Hottest year, 1793 
July, 
72.011 
Spring, 46.05 
Coldest year, 1812 
August, 
70.522 
Summer, 69.84 
September, 
62.702 
Autumn, 51.308 
October, 
51.148 
November, 
40.014 
Mean of Spring and Autumn, 
48®,679 
December, 
30.179 
Winter and Summer, 
48.671 
Annual Mean 
of 33 Years, 
48.678 
The mean temperature of the parallel of 42® 33' being thus 
established by the most rigorous and long continued observa- 
tion to be 48°. 68 it will be interesting to compare it with a si- 
milar parallel in the Old World. Rome, which is placed in 
Lat. 41° 53', approaches within 40' of the parallel of Salem, and 
will therefore serve for making the comparison : 
Meap Temperature of Salem, in the New World, 
Mean Temperature of Rome, in the Old World, 
Lat. 
42° 33' - 
41 53 - 
48®.68 
60.44 
Difference, 
11®. 76 
This result will, we trust, set at rest for ever the ridiculous opi- 
nion that the Old and the New'^World have the same average 
temperature. 
It is worthy of remark, that Dr Holyokes’s observations give 
the mean temperature of Salem considerably less than that of 
• Dr Holyoke, and other scientific individuals of the American Academy, are 
of opinion that this result errs rather in excess than in defect^ in consequence of the 
heat reflected upon the thermometer from the north wall of the street. — See JWc- 
vtioirs of the Amer. Acad. vol. iv. p. 386. 
