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CLIMATE.
27
Mean-temperature of each day in the year.
The beneficial influence of the summer light in Sweden is still
more increased by the considerable number of hours of bright sunshine,
which is, at this season of the year, greater at Jockmock, in the interior
of Lappland, than at Rome or Madrid. This is explained by the length
of the time during which the sun is above the horizon, and also
by our relatively clear summer sky. On an average for the whole
country, only 50 per cent of the sky is covered with clouds during
the month of June, and 74 in December. This phenomenon, of which
the cause is unknown, brings with it very important consequences for
our climate. For the heating effect of the sun-rays is thus relatively
unimpaired in summer, whereas the loss of heat caused by radiation
is for the greatest part intercepted in the winter season, which gives
us a relatively hot summer and a not very cold winter. In the
interior and the north of the peninsula, there are, however, two regions,
where the winter radiation is less impeded by clouds, while the warm
south-westerly winds are shut out by the Scandinavian mountain-range,
and here, during that season, two centers of cold are formed, which
play an important part in the winter climate of Sweden. One of them,
the smaller and weaker, has its center at 62° N.L., north of Kristiania.
It includes Herjedalen and North Dalarne in Sweden, and in Norway
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