67
5.2.3 Hat Yai
With respect to maximum temperature and minimum temperature it is seen that the summer maximum temperature is not in increasing trend Figure 5.24, whereas the minimum
temperature in summer is increasing Figure 5.24. During winter, significant increasing trend of minimum temperature is reported Figure 5.25 and relatively little increasing trend in
maximum temperature. Thus, the nights are becoming warmer both in summer and winter.
It is also seen from Figure 5.26 that the number of days with more that 35 C during summer
months Mar to May although shows many peaks during the period from 1980 to 2008 like 1983, 1992, 1995, 1998 and 2005, the frequency is not showing increasing trend. It is also
seen from Figure 5.26 that during the warmest year 1998, the whole April days were with 5
C.
28 30
32 34
36 38
1980 1982
1984 1986
1988 1990
1992 1994
1996 1998
2000 2002
2004 2006
2008
Year Ma
x T
e m
p e
rat u
re
22 23
24 25
M in Te
m pe
ra tur
e Tmi
n
TmaxApr Tmin Apr
Linear TmaxApr Linear Tmin Apr
Figure 5.24. Monthly temperature variations Tmax, Tmin from 1980 to 2008 during winter season Apr over Hat Yai Source: Thailand Meteorological Dept. and Analysis
68
27 28
29 30
31 32
33
1980 1982
1984 1986
1988 1990
1992 1994
1996 1998
2000 2002
2004 2006
2008
Year M
ax T em
p er
at u
re
20 21
22 23
24
M in Te
m pe
ra tur
e Tm
in
TmaxJan Tmin Jan
Linear TmaxJan Linear Tmin Jan
Figure 5.25. Monthly temperature variations Tmax, Tmin from 1980 to 2008 during winter season Jan over Hat Yai Source: Thailand Meteorological Dept. and Analysis
5 10
15 20
25 30
35
1 9
8 1
9 8
2 1
9 8
4 1
9 8
6 1
9 8
8 1
9 9
1 9
9 2
1 9
9 4
1 9
9 6
1 9
9 8
2 2
2 2
4 2
6 2
8
N o
o f
d a
y s
3 5
d e
g C
Year
MAR APR
MAY Line ar A PR
Figure 5.26. Number of days with Tmax more that 35 C during hot weather season from March to May
over Hat Yai. The linear trend for April is plotted in the figure Source: Thailand Meteorological Dept. and Analysis
5.2.4 Phuket
The trend in Tmin and mean Temperature show increasing trend during summer Mar-May over Phuket as shown in Figure 5.27b and Figure 5.27c.
69
Figure 5.27. Monthly mean temperature variation during hot weather season March to May from 1980 to 2008 over Phuket. a Maximum temperature, b Minimum Temperature and c Mean Temperature.
The linear trend line for April is plotted Source: Thailand Meteorological Dept. and Analysis
70
In winter, all the three temperatures are increasing with maximum increase of Tmin Figure 5.28 with rate of increase of minimum temperature is much higher Figure 5.28b than that
of increase of Tmax and mean T Figure 5.28a and Figure 5.28c.
Figure 5.28. Monthly mean temperature variation during cold weather season December to February from 1980 to 2008 over Phuket. a Maximum temperature, b Minimum Temperature and c Mean
Temperature. The linear trend line for January is plotted Source: Thailand Meteorological Dept. and Analysis
71 Thus, this shows the summer and winters nights are becoming more warmer and clear
indication of climate change and has contributed to increase of mean T as shown in Figure 5.28. The similar pattern is also reflected with highest Tmax in summer April and lowest
Tmin in winter Dec.
5.3 Sea level rise and storm surges
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