British Rainfall 1895, p.20
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British Rainfall 1895 page 20
but on turning to the table on page 19 of British Rainfall, 1867, they are amply confirmed by the old-established records at Troutbeck and Keswick, so that their accuracy can hardly be questioned. Moreover they followed shortly after the driest four consecutive years in the whole record. The four years, 1855-58, had a mean of 106.26 in., and the four years, 1860-1863, of 167.16 in., or more than half as much more. One four years is 31.05 inches below the average, and the other 22.85 inches above it, so that the eight years give a mean within an inch of that for the whole fifty years.* Fluctuation of Yearly Rainfall. - We have been obliged to touch upon this subject in the previous section; we now proceed to consider it fully, and to compare Seathwaite results with previous investigations respecting other stations. Column3 on p.25 gives the ratio which the fall of every year at Seathwaite bore to the mean for the 50 years, e.g.:- Fall in 1844 = 157.87; Mean of 50 years, 137.31. Then 151.87/137.31 = 1.11, which, to avoid decimals, is written 111 (the average being taken as 100).The essential features as to fluctuations are those which will occur in one year, in two consecutive years, and in three consecutive years. The following are the values for Seathwaite:- |
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In British Rainfall, 1883, pp.29-32, there is an
article "On the limits of fluctuation of total Rainfall,"
which shows that on the average of 45 stations (only one,
however, exceeding 70 inches of mean fall) the values
corresponding with the above are -
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As the values for the dry extremes in the above-mentioned
article
* Confirmation respecting each of these extremes will be found in the following papers:- DAVY, DR. JOHN, F.R.S. On an unusual drought in the Lake District in 1859. Edinb. Phil. Soc. Trans. xxii., 1861, pp.313-318. DAVY, DR. JOHN, F.R.S. On the rainfall of the Lake District in 1861. Edinb. Phil. Soc. Trans. xxiii., 1861, pp.53-66. |
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