Observations on the climate of Penzance and the district of the Land's End in Cornwall : with an appendix containing meteorological tables, and a catalogue of the rarer indigenous plants. Read before the Penwith Agricultural Society, and published by request of the members / By John Forbes.

  • Forbes, John, Sir, 1787-1861.
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 : with an appendix containing meteorological tables, and a catalogue of the rarer indigenous plants. Read before the Penwith Agricultural Society, and published by request of the members / By John Forbes. Source: Wellcome Collection.

    36/68 (page 32)
    number of times the thermometer fell below the freezing point Nov. Dec, Jan, Feb, Mar, Apr, Mean of the minimum temp. \ 36„ 2£)0 2yo 33o 33o 36o m each month, for 13 years / Number of times below 32° during 13 years » v 32° ^ 4 10 9 4 8 2 THUNDER. Thunder appears to be of rarer occurrence in this district than in most others in the kingdom.* The his¬ torians of Cornwall, it is true, like all topographical writers, have occasion to record some severe thunder¬ storms which committed considerable damage; but these seem recorded rather from their calamitous events, memorable in a confined neighbourhood, than from any thing uncommon in their severity. From our Tables it appears that the mean number of days on which thunder has been heard, annually, is only two and half, and the greatest number of days in any one year is only seven. It also appears that the three winter months, January, February and March, are those in which thunder is most frequent; a circum¬ stance, I apprehend, which is contrary to the state of the fact in most temperate countries, summer being the season in which this meteor most frequently occurs. With the view of rendering this peculiarity more obvious, I shall here contrast the average number of thunder-storms in each month, for a period of * See Tables III, and IV.