248 DR. A. A. RAMBAUT ON UNDERGROUND TEMPERATURE AT OXFORD 
Divisions of the Year. 
Ordinary Years. 
Leap Year. 
Division. 
No. of days. 
| 
No. of days. 
I. 
Jan. 1 to Jan. 30 (inclusive) 
30 
1 
Jan. 1 to Jan. 31 
<■>1 
oi 
II. 
Jan. 31 to Mar. 1 
5 ? 
30 
Feb. 1 ,, Mar. 1 
30 
III. 
Mar. 2 ,, April 1 
55 
31 
31 
IV. 
April 2 ,, May 1 
55 
30 
30 
y. 
May 2 ,, June 1 
55 
31 
31 
VI. 
June 2 „ July 1 
55 
30 
30 
VII. 
July 2 „ Aug. 1 
55 
31 
31 
VIII. 
Aug. 2 „ Aug. 31 
55 
30 
30 
IX. 
Sep. 1 ,, Oct. 1 
55 
31 
31 
X. 
Oct. 2 ,, Oct. 31 
55 
30 
30 
XI. 
Nov. 1 ,, Dec. 1 
.55 
31 
31 
XII. 
Dec. 1 „ Dec. 31 
>5 
30 
30 
For the sake of convenience, I have retained below the usual names of the months 
for these twelve divisions of the year. A good deal might, I think, be said in 
favour of adopting these intervals for all meteorological returns where the means of 
daily observations are taken. 
The monthly means so obtained for the live thermometers are given in the follow¬ 
ing table:— 
Mean Monthly Temperature of the Ground at the 11 a deli lie Observatory, 
Oxford, 1899. 
Thermometer. . 
1 
9 
-j 
3 
4 
5 
Depth .... 
64 in. 
1 ft. 6 in. 
3 ft. 6| in. 
5 ft. 8£ in. 
9 ft, 11J in. 
January . 
40-47 
42-07 
44-68 
46-80 
49-97 
February . 
40-09 
41-34 
43-25 
45-08 
48-33 
March .... 
41-34 
41-91 
43-21 
44-74 
47-42 
April .... 
48-77 
47-66 
46-61 
46-40 
47-37 
May .... 
54-86 
52-95 
50-96 
49-54 
48-53 
June .... 
66-73 
62-89 
58-29 
54-73 
50-88 
July . . . . 
69-43 
65-93 
62-15 
58-74 
53-85 
August . . . 
69-23 
67-79 
64-88 
61-66 
56-39 
September . . 
59-34 
61-12 
62-03 
61-19 
57-80 
October 
48-99 
51-14 
54-29 
56-12 
56-71 
November . . 
46-73 
48-43 
50-99 
52-69 
54-48 
December 
38-14 
41-08 
45-35 
48-58 
52-33 
i 
The observations were taken within a short time of noon on every day through¬ 
out the year without exception. They were for the most part made by Mr. 
