6 H. MØLHOLM HANSEN 
These facts, however, seem merely to apply to conditions either 
at the level of the sea, or perhaps only by the coast. If we take a 
station like Mößrudalur, situated approximately on a line connecting 
Grimsey with Berufjérdur, but at an altitude of 480 m above sea level, 
this station shows an average of 39 stormy days annually, though 
distributed in such a way that the winter has the highest, the summer 
the lowest number of stormy days. 
Temperature conditions. Above we saw that the temperature of 
the air near the sea was very closely correlated to the surface tem- 
perature of the sea water, but with the addition that the tempera- 
ture of the sea water was always higher, 1—2° C., than that of the 
air. In table 1 are shown the average annual and monthly mean 
temperatures for South Iceland, West Iceland, East Iceland, and the 
highland Médrudalur. There is a considerable difference between the 
coastal stations on the one hand and the highland on the other 
hand, a difference which may also be shown to exist between the 
coastal stations mutually. 
The mean temperature is highest in South Iceland, being 5.1° C. 
at the Vestmannaeyjar. The coldest month here is December with 
a mean temperature of 1.2°, the warmest month is July with 10.6°. 
The difference between the coldest and warmest months is 9.4°. 
West Iceland, Stykkishölmur, has a mean annual temperature of 2.8°, 
the coldest month, February, registering a mean temperature of 2.7° 
below zero, the warmest month (July) 9.7°, with a difference of 12.4°, 
Berufjöröur in the east country has the same mean annual tem- 
perature, 2.3°; here March is the coldest month, 1.7° below zero, 
July the warmest, 8.5°, and the difference between the coldest and 
warmest months is somewhat less, 10.2°. 
Grimsey, in the north country, has a mean annual temperature 
of 1.5°, a mean temperature for March of 3.6° below zero, for July 
of 7.0°, difference 10.6°. 
The highland is considerably colder. The mean annual tem- 
perature for Möörudalur is 0.2° below zero, the January temperature, 
7.2° below zero, the July temperature 10.0°. The difference, 17.2°, 
is thus considerably greater than that of the coastal stations. 
The number of frosty days is closely correlated to the tempe- 
rature conditions. The smallest number is recorded from South 
Iceland which shows an average of 109 per annum. Grimsey has 
the greatest number, 192. Berufjöröur lies between these two extremes 
with 158 frosty days and Stykkishölmur with 166 frosty days. Un- 
