Observations on the climate of Penzance and the district of the Land's End in Cornwall / by John Forbes.

Date:
1821
Catalogue details

Licence: Public Domain Mark

Credit: Observations on the climate of Penzance and the district of the Land's End in Cornwall / by John Forbes. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    I lie following is the mean of the morning and afternoon observations taken together at both places: Tresco. I’enzaucc, Mean of September - - - 59.50 — (j(jo October & November 53.5° — 53o both 56.5® — 50.5° This proves the mean temperature of both places to be precisely the same. The superior equability ot the island is further shown by the following results:— 2.20» — 2.82° Tresco. Penzance. Mean diurnal range for the 46 days - - 3.23° — 6.23° Mean variation of successive days at the same hour in the morning - - f Extreme range during the 46 days - - 24° — 32° Greatest diurnal range ------ 6° — 1530 Maximum temperature during (he 46 days 67° — 70<> Minimum temperature during ditto - - 43° — 38® With the view of still further illustrating the ef- fects of a very small difference of situation on the temperature, I have given in Table VI. the results observed by Mr. John Giddy, at Calenick, near Truro. This place is on the same level as Penzance, and differs from it chiefly in being removed several miles from the sea, and in being about 20 miles to the N. & E. of it. These two circumstances, it ap- pears, operate in the same manner as in the case of the situations just mentioned, but in a degree, of course, proportioned to their extent. Thus, it ap- pears that the mean annual temperature of Penzance is a fractional part of a degree above Calenick; while winter and autumn are a full degree warmer. The
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