Joint International Conference on Long-term Experiments ...

October, and at higher altitudes (0.3 days at Stana de Vale) until September (0.4 days at
Stâna de Vale).
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Figure no. 4: Variation of the medium number of
summer days (maximum temperature ≥25ºC) in the
Crişul Repede hydrographical basin during the period
1970-2005
I II III IV V VI VII VIII IX X XI XII An
Borod
Oradea
Sacueni
Stâna de Vale
5. Average frequency of tropical days (maximum temperature.≥30ºC)
High temperatures (≥30ºC) are conditioned by the movement of dry tropical air masses
within the country’s territory. The tropical days are days in which the maximum air
temperature is greater or equal with 30ºC.
The maximum number of tropical days in the Crisul Repede hydrographical basin,
as an average, is recorded at Oradea, 24.3 days, and at Săcueni, 20.3 days, then they
begin to drop as the altitude rises, 10.3 days at Borod, while at Stâna de Vale they
disappear (fig.5).
The favourable annual interval for producing tropical days takes place between
May and September, with a maximum number of days in August at Borod 4.2 days, in
July at Oradea 9.1 days and 7.6 days at Săcueni (fig.5).
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