RAINFALL IN HERTFORDSHIRE IN 1903 . 
103 
The average number of wet days in each month was as follows :— 
Jan., 18; Feb., 11; March, 19; April, 12; May, 15; June, 10; 
July, 15; August, 18; Sept., 14; Oct., 27 ; Nov., 15; Dec., 14. 
The deviation from the mean for the 30 years 1870-99 was : 
Jan., + 3 ; Feb., — 2 ; March, + 6; April, — 1 ; May, + 3 ; 
June, — 2 ; July, 4- 1 ; August, + 4 5 Sept., + 1 ; Oct., -j- 11 ; 
!Nov., — 1 ; Dec., — 2. 
Distribution of the Rainfall throughout the County. —The next 
table (Table IY) gives the mean fall in each month and in the 
year in each of the five river-districts represented, and in the two 
main hydrographical divisions of the county, the catchment-basins 
of the Great Ouse and of the Thames, and also the difference in the 
year from the mean for the 20 years 1880-99. 
Table IY.— Rainfall in the River-Districts. 
Months. 
Cam. 
Ivel. 
Thame. 
Colne. 
Lea. 
Ouse. 
Thames. 
ins. 
ins. 
ins. 
ins. 
ins. 
ins. 
ins. 
Jan. 
2'l6 
2-42 
2-78 
2-63 
2-19 
2-36 
2-42 
Feb. 
■62 
•93 
i-i 4 
1x3 
•95 
•85 
IXO 
March 
2-54 
3-10 
3 M 7 
3'43 
2-99 
2-96 
3*22 
April. 
1-31 
i '43 
1-85 
1-82 
1-50 
1-40 
1*67 
May .... 
3 ' 6 o 
3 '°° 
2-89 
2-57 
2-52 
3-15 
2-56 
June .... 
5 ‘67 
6-03 
6 63 
585 
5’73 
5'94 
5^3 
July . 
476 
4-04 
3-83 
3‘59 
4-74 
4-22 
4-15 
August 
3-12 
3‘44 
4-89 
3-83 
4-04 
3-36 
3*9 7 
Sept. 
1 -8i 
2-02 
2’2I 
2-49 
2*72 
1-97 
2'59 
October 
4'54 
5'53 
8-05 
7-28 
6 01 
5-28 
6-71 
Nov. 
i ‘95 
2-10 
2-23 
1-97 
211 
2x6 
2-05 
Dec. 
i ‘55 
179 
2-38 
2 ’37 
1-83 
i ‘73 
2-12 
Year 
33 b 3 
35'83 
42-35 
38-86 
37-33 
35-28 
38-29 
Diff.from 
1880-99 
+ io-8o 
+ 11-39 
+ 17X8 
+ H -33 
+ 12*68 
+ H -43 
+ 12'11 
The rainfall of the Colne and Lea districts deviated but slightly 
from the mean for the county, the Colne district having an excess 
of one inch and the Lea a defect of half an inch. The Ivel district 
had two inches less than the mean, and the Cam about four inches 
less, while the Thame had four and a half inches more. 
The mean fall in each of the minor river-basins or sub-districts 
represented was as follows :—( Cam) Rhee, 33-63 ins. ; {Ivel) Upper 
Ivel, 33-69 ins.; Hiz, 36*26 ins.; {Thame) Upper Thame, 42-35 ins.; 
{Colne) Bulbourne, 40-16 ins. ; Gade, 39*18 ins.; Yer, 38-13 ins.; 
Upper Colne, 37*74 ins. ; Lower Colne, 38-37 ins. ; {lea) Mimram, 
37*59 ins.; Beane, 36*44ins. ; Rib, 3619 ins.; Ash, 37-65ins. ; 
Stort, 4U72 ins. ; Upper Lea, 35-36 ins. ; Lower Lea, 39*39 ins. 
The rainfall reached at least one inch in 24 hours ending 
9 a.m. on thirteen occasions during the year; once in May, July, 
September, and November; twice in August and October; and five 
times in June. On one of these occasions in June it exceeded two 
inches, and in July it exceeded three inches, this excessive fall 
