66 
Monthly mean of the AIR TEMPERATURES IN °C 
Szczecin, Zalew Szcz. 
Ueckermunde, Zalew Szcz. 
Swinoujscie, sea area 
December 
2.4 
2.3 
2.3 
January 
1.4 
1.6 
1.6 
February 
4.0 
4.0 
3.9 
WATER TEMPERATURES IN °C 
Szczecin, Zalew Szcz. 
Trzebiez, Zalew Szcz. 
Swinoujscie, sea area 
min 
max. 
min 
max. 
min 
max. 
December 
0.5 
4.8 
0.6 
4.8 
0.3 
5.5 
Monthly mean: 
2.8 
2.6 
3.1 
January 
0.1 
2.6 
0.1 
2.4 
0.0 
2.5 
Monthly mean: 
1.2 
1.4 
1.2 
February 
1.0 
4.5 
2.4 
4.8 
1.6 
3.6 
Monthly mean: 
3.3 
3.6 
2.7 
Daily mean air temperatures in the winter of 1999/2000 were above 0°C, with the exception of four 
short frost periods, as shown in Figure 6.1 (Ueckermunde station, data from German Weather Service). 
Only two of these frost periods caused some ice formation in the inner coastal waters. The first frost pe 
riod started on 19 December and continued until 23 December. First ice formation was observed in the 
protected coastal lagoons on 23 December. The period with negative mean daily air temperatures, which 
lasted from 21 to 25 January, again caused ice formation in the inner waters for about one week. 
o 
o 
C 
0) 
1— 
3 
+■• 
CB 
i- 
V 
Q. 
E 
0) 
-2 
-4 
Figure 6.1. Running 5-day means of air temperature in Ueckermunde in the winter of 1999/2000