The waether conditions in Dalmatia reflect the very pleasant mediterranean climate. The following table shows average sea- and air-temperatures for each month of the year:
month
temperature
I
13 ?C
II
12 ?C
III
13 ?C
IV
14 ?C
V
17 ?C
VI
21 ?C
VII
23 ?C
VIII
24 ?C
IX
22 ?C
X
19 ?C
XI
16 ?C
XII
14 ?C
month
temperature
I
10 ?C
II
11 ?C
III
14 ?C
IV
18 ?C
V
22 ?C
VI
27 ?C
VII
31 ?C
VIII
31 ?C
IX
26 ?C
X
21 ?C
XI
16 ?C
XII
11 ?C

The actual weather conditions for Split and Croatia, you can experience here.
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