The climate of the United States and its endemic influences. Based chiefly on the records of the Medical Department and Adjutant General's Office, United States Army / By Samuel Forry.
- Samuel Forry
- Date:
- 1842
Licence: Public Domain Mark
Credit: The climate of the United States and its endemic influences. Based chiefly on the records of the Medical Department and Adjutant General's Office, United States Army / By Samuel Forry. Source: Wellcome Collection.
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![All the thermometrical data contained in the “‘ Army Meteorologi- cal Register” have been condensed, so far as practical results are con- cerned, into three tabular abstracts, forming an Appendix to Part First, viz., 1. Abstract A, exhibiting the mean temperature of each month, — each season, and the whole year; 2. Abstract B, showing the difference between the mean temperature of each month and éf each season ; and 3. Abstract C, exhibiting the mean annual and monthly ranges of temperature. Having said that the Northern Division, HOtwith standing the mean annual temperature presents little variation on the same parallels, exhibits four striking inflections of the isotheral and isocheimal lines, constituting two systems of climate on the same latitude, viz., that of the ocean and lakes which pertains to the class — of mild or a etn and that of the intervening tract and the region beyond the lakes, characterized as climates emphatically eacessive, the more important results relative to the Northern Division, as pre- sented in detail in the Abstracts to which reference has just been made, will now be exhibited in Table [A] on the opposite page. It is thus seen that, notwithstanding the posts on the same parallels of latitude exhibit in rapid succession four marked inflec- tions of the isotheral and isocheimal lines, causing a great difference in the contrast of the seasons, yet the mean annual temperature pre- sents little variation. ‘The difference of climate is, therefore, owing to the unequal distribution of heat among the seasons. A single glance at the table, as well as the map, Plate I, serves to show these various contrasts. It will be observed that at the posts on large bodies of water, the mean temperature of winter is higher and that of summer is lower than in the opposite localities; but these results are more satisfactorily manifested by comparing the differ- -ence between the mean temperature of winter and summer, and the warmest and coldest month, in each system of climate. Thus Fort Brady, at the outlet of Lake Superior, shows a difference of only 42°.11 between the mean temperature of winter and summer, whilst Hancock Barracks, half a degree further south, in the State of Maine, distant only 150 miles from the sea-coast, exhibits a disparity of 46°.19 ; and comparing the warmest and*coldest month, the differ- ence of the former is 47°.22, and that of the latter 54°.70. Again, Forts Sullivan and Snelling, in opposite systems of climate, are ver nearly in the same latitude; the former at Eastport, on the code Maine, and the latter at the junction of the St. Peter’s and Mississippi, Iowa. At Fort Sullivan, the difference of winter and summer is 39°.15, and that of the warmest.and coldest month, 48°.87 ; whilst](https://iiif.wellcomecollection.org/image/b33288379_0044.jp2/full/800%2C/0/default.jpg)
