THE YORK RAINFALL. 
6l 
MEAN DAYS WITH RAIN, SNOW, &c., IN DECADES, 1811*—1900. 
Decade. 
Yearly. 
Jan. 
Feb. 
Mch 
Apl. 
May 
Jun- 
Jnl. 
Aug. 
Sept 
Oct. 
Nov 
Dec. 
Decade. 
II. 
1841-50 
159-8 
13-1 
9-8 
13-7 
14-3 
14-2 
12-2 
13-3 
13-8 
10-4 
17-6 
14-4 
12-5 
II. 
III. 
1851-60 
147-3 
12-6 
10-0 
9-5 
10-4 
1 1-8 
13-9 
1 1-0 
12-5 
12-2 
15-7 
15-0 
12-8 
III. 
IV. 
1861-70 
1 68-0 
11-7 
13-9 
15-8 
12-3 
11-6 
11-2 
10-5 
13-4 
15 3 
16-7 
16-3 
16-3 
IV. 
V. 
1871-80 
187 9 
15-1 
16-4 
16-5 
14-6 
13-9 
14-4 
15-5 
15-3 
15-1 
16-5 
18-1 
16-7 
V. 
VI. 
1881-90 
190-0 
16-8 
15-1 
1.5-1 
15 -5 
14-0 
11-2 
16-3 
15-3 
15-7 
18-5 
19-4 
1 7-4 
VI. 
VII. 
1891-00 
187-2 
18-2 
14-4 
16-4 
13-9 
13-9 
13-0 
13-0 
17-1 
14-1 
18-7 
17-6 
17-9 
VII. 
Range 
42-7 
5 - 6 
6-6 
7-0 
5-1 
2-6 
3-2 
5-8 
4-6 
5-3 
3-0 
5-0 
5-4 
Range 
Most Days 
VI. 
VII. 
V 
V. 
AH. 
II. 
V. 
VI. 
VII. 
IV. 
VII. 
VI. 
VII 
AVettest 
Least Days 
III. 
III. 
II. 
III. 
III. 
IV. 
j IV. 
1 VI. 
IV. 
III. 
II. 
II. 
II. 
II. 
Driest 
GO Years ... 
173-4 
15-1 
1.3-3 
14-5 
13 5 
13-2 
12 8 
1.3-3 
146 
13 8 
,7 ' ! 
16-8 
15 6 
60 years 
Yearly. 
I. 
II. 
III. 
IV. 
V. 
VI. 
VII. 
VIII. 
IX. 
X. 
XL 
XII 
* The Returns previous to 1841 are incomplete. 
It will be noted that the 70 years mean of 24*766 ins. is 
nearly \ in. less than that for 50 years (25*005). This result 
justifies the suggestion made on p. 54 of the 1891 Report, that 
the 50 year average was greater than the true value in con¬ 
sequence of the abnormal fall in the seventies. 
Assuming that for 70 years the limit of error is -f the 
variation of the seven decades from the mean, we may now 
consider that the mean rainfall for York is 24*766 + 0*341 ins. 
and still regard this value as above rather than below the true 
mean. This may be based on the two following facts : — 
Adding to the above the (corrected) values for 1811-24, we 
find a mean of 24*728 inches for the period of 84 years. 
Omitting the seventies decade, the mean for the other 60 
years, 1831—1900 is 24*222 inches. 
We may therefore conclude pretty safely that the true mean 
for York does not differ much from 24 b inches. 
The days with rain were not fully recorded in the thirties. 
The indication is that the mean was about 150. For the last 
decade the mean is 187*2, which brings up the mean for 
60 years to 173*4. The first three decades are all less, the last 
three more than the mean. Does this indicate a more 
stringent registration, since 1870, of each day's rainfall, or is 
it confirmed by records elsewhere ? 
