Jökull - 01.12.1991, Blaðsíða 12

Fig. 11: Correlation coefficients of monthly
temperature between four pairs of weather stations.
Mynd 11: Dœtni umfylgni mánaðarhita milli
veðurstöðva.
below 0.80. Although the correlation decreases some-
what in the most remote regions it can be concluded
that variations of annual temperature frorn year to year
are generally in the same direction in all parts of the
country. The amplitudes are on the other hand variable
between stations or districts as the standard deviation
of the annual temperature (Fig.4) confirms.
Examples are given in Fig. 11 of the variability of
correlation coefficients of monthly temperatures
between different weather stations.
Monthly temperatures at different stations are
nicely correlated for the months January-April and
September-December with coefficients >0.80 regard-
less of the choice of basic stations. For May the coef-
ficients are generally slightly lower while the picture
for the summer is quite different.
For the summer months June-August the correla-
tion is still good between stations within the same
weather area, i.e. where the main characteristics of
each weather type is similar, as for Reykjavík and
Stórinúpur/Hæll in Fig.l 1. The same is the case for
stations where the summer temperature behaves in a
similar way in different weather types, in spite of a
considerable distance in between, as for Akureyri
and Hallormsstaður in Fig.l 1. On the other hand the
correlation coefficients are low between stations
in different parts of the country, often separated
by the main highland. In Fig.ll this is the case
for Reykjavík-Akureyri and Akureyri-Stórinúpur/
Hæll.
Fig. 12: Distribution of correlation
coefficients of the temperature of July
between Hallormsstaður as a basic
station and other stations.
Mynd 12: Fylgni júlíhita á
Hallormsstað við aðrar veðurstöðvar.
10 JÖKULL, No. 41, 1991