June 4-30 4'990 5 19 0
July 9'635 4 18 3
August 8'020 4 21 0
September 7'465 7 11 1
October 7'660 9 13 0
November 6'015 11 14 1
December 2'975 4 1 24
______
46'760
1908
January 4.565 11 12 0
February 6.105 10 12 0
March 4.360 7 17 2
April 7.605 14 8 1
May 4.305 9 21 0
June 5.775 0 25 0
July 4.800 5 21 0
August 6.325 8 18 0
September 6.630 3 21 0
October 6.675 11 9 0
November 2.440 11 8 0
December 5.255 10 10 0
______
64.840
1909
January 3.060 7 19 0
February 4.720 11 7 3
March 5.295 9 14 1
______
13.075
The following observations on the wind are derived from Andréa Repetto:—
The wind at Tristan generally changes from northward to westward or southward. The change begins with rain. A very light wind from the northward (NE. or N.) will spring up, and may last for a day or two; then it becomes unsettled and with rain changes to the westward. But this initial wind may come from the NW., W., SW., or S. This movement of the wind from the northward to westward or southward generally happens when the weather is settled and the wind is light, or in the warm season (spring, summer and autumn); but sometimes it happens in unsettled weather, in which case the rain pours down at once and the wind from the north lasts only a short time. When this northward wind begins in unsettled weather it changes to the south, as a rule, without staying at any of the intervening points, and does so with a heavy squall or shower. When the wind from the north is a light one it generally changes to a light one from the south; and when it is a heavy one from the north it generally changes to a heavy one from the south; this latter happens usually in the winter when the weather is for the most part unsettled.
In the warm season when the wind is very light it very often goes round the four cardinal points every twenty-four hours for a week together.
The wind hardly ever changes from the northward to the eastward. On the very rare occasions when it may do so, the wind being very variable, it never stands there but quickly returns to the northward.
The wind may instantly change (e.g. after one shower) from northward to south; and sometimes from here (the south) it goes to SE., where it may stay a week; if it gets as far as the east it will not stay for more than a day or two, but will go on to the NE.; but it does not get so far as the E. more than once in a year, and perhaps not for two years, and always without rain.
When the wind gradually changes from northward to the south it stays a short time in the west, then as the day advances in the SW., and gets to the S. in the evening, each of those three movements being preceded by squalls or showers. On reaching the S. it settles there for a day or two. If during this day or two there are showers a movement will begin. In the morning this movement will be without a shower from the S. to the W.; but in the evening it will be with a shower back from the W. (to which it had gone in the morning) to SW. or S. This movement may last for a week or two.
In fine weather when the wind springs from the northward the first day is generally fine and clear, then it becomes cloudy or dull for a day or even a fortnight; then it will change to the westward with a squall, or shower, or sometimes heavy rain.