The Botany of Iceland - 01.12.1912, Blaðsíða 59

MARINE ALGAL VEGETATION
45
As shown by the figures there is a considerable difference in
the amount of precipitated moisture. That of Thorshavn is greatest,
next come the Vestmannaeyjar, followed by Berufjörður. The preci-
pitation at Stykkishólmur is not more than half that in the Vest-
mannaeyjar, and that of Grímsey is not more than a fourth part
of tliat in the Vestmannaeyjar.
b. Mean Amount of Cloud (Will a u m e - J a n t z e n , 1. c.
Scale 0—10. Winter Spring Summer Autumn
E. Icel. Berufjörður (23 years) 6.4 6.6 6.9 6.6
N. Icel. Grímsey (22 years) 8.5 8.2 7.9 8.5
S\V. Icel. Stykkishólmur (22 years).... 7.1 6.4 6.0 6.9
S. Icel. Vestmannaeyjar (18 years) 6.2 6.1 6.1 6.3
Thorshavn in the Færöes (25 years). . 7.4 7.1 7.7 7.5
The amount of cloud is greatest in Grímsey, and there is no
great difference between the remaining three coast-stations in Ice-
land. In Tliorshavn, however, the amount of cloud is considerably
greater and consequently this place approximates to Grímsey.
c. Foggy and Wet days. Mean number of Foggy days (Wil-
laume-Jantzen, 1. c.). Winter Spring Summer Autumn The year
E. Icel. Berufjörður (23 years). 44.0 52.0 67.0 49.0 212
N. Icel. Grímsey (22 years) . .. 2.4 13.0 31.0 7.0 53
SW.Icel.Stykkishólmur(22 years) 1.0 2.6 4.1 1.3 9
S.lcel. Vestmannaeyjar (18 years) 7.0 12.0 21.0 12.0 52
Thorshavn in the Færöes (25 yrs.) 3.0 10.0 29.0 9.0 51
The number of foggy days in Beruijörður is remarkably high,
and at Stykkishólmur is extremely low. In Grímsey the number is
niuch lower during the winter months, and higher during the
summer months than it is in the Vestmannaeyjar; there are also
small differences during spring and autumn. There are only small
differences between the Færöes and the Vestmannaeyjar, except in
the winter, when the Vestmannaeyjar have twice as many foggy days.
Mean number of Wet days (Willaume-Jantzen, 1. c.).
Winter Spring Summer Autumn The year
E. Icel. Berufjörður (23 years). 52 43 34 48 177
N. Icel. Grímsey (22 years) . .. 40 29 29 45 143
S\V.Icel.Stykkishólmur(22 years) 58 47 40 52 197
S. Icel. Vestmannaeyjar(18 years) 64 55 47 59 225
Thorshavn in the Færöes(25 yrs.) 81 66 58 74 279
At all seasons the number of wet days is highest in the Færöes