Meteorology and Hydrology
| 
| 
Temperature
Average Maximum and Minimum Temperature by Year
Unit : ˚C
|
Year |
Weather Station |
|||||||||||||||||||||||
|
Luangprabang |
Vientiane. Capital |
Savannakhet |
Pakse |
|||||||||||||||||||||
|
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
|||||||||||||||||
|
1976 |
30.1 |
20.1 |
30.6 |
21.7 |
30.1 |
19.3 |
31.3 |
22.4 |
||||||||||||||||
|
1980 |
31.9 |
20.5 |
31.5 |
22.4 |
32.0 |
22.1 |
32.0 |
23.2 |
||||||||||||||||
|
1985 |
34.9 |
16.4 |
34.2 |
21.0 |
35.4 |
18.0 |
33.6 |
20.3 |
||||||||||||||||
|
1990 |
31.2 |
20.0 |
31.0 |
22.6 |
29.4 |
24.2 |
32.1 |
23.0 |
||||||||||||||||
|
1995 |
31.2 |
20.0 |
31.0 |
22.6 |
29.4 |
24.2 |
32.1 |
23.0 |
||||||||||||||||
|
1996 |
30.8 |
20.2 |
30.9 |
22.2 |
31.3 |
21.8 |
31.8 |
23.3 |
||||||||||||||||
|
1997 |
31.6 |
20.3 |
31.4 |
22.6 |
31.4 |
21.6 |
32.1 |
23.1 |
||||||||||||||||
|
1998 |
32.5 |
20.2 |
32.5 |
23.2 |
32.7 |
22.8 |
33.1 |
24.4 |
||||||||||||||||
|
1999 |
30.8 |
20.2 |
30.9 |
22.2 |
31.3 |
21.8 |
31.8 |
23.3 |
||||||||||||||||
|
2000 |
31.4 |
20.1 |
31.4 |
22.2 |
30.3 |
20.8 |
32.3 |
23.4 |
||||||||||||||||
|
2001 |
31.6 |
20.9 |
31.7 |
22.6 |
31.4 |
21.5 |
32.8 |
23.1 |
||||||||||||||||
|
2002 |
30.9 |
20.3 |
31.6 |
22.5 |
32.4 |
22.0 |
33.1 |
23.6 |
||||||||||||||||
|
2003 |
32.0 |
19.9 |
31.8 |
22.3 |
32.4 |
22.6 |
32.5 |
22.8 |
||||||||||||||||
|
2004 |
31.7 |
19.4 |
31.2 |
22.1 |
31.7 |
21.1 |
32.4 |
23.1 |
||||||||||||||||
|
2005 |
32.2 |
19.8 |
31.8 |
22.7 |
31.8 |
22.0 |
32.4 |
23.7 |
||||||||||||||||
|
2006 |
32.6 |
20.3 |
31.7 |
22.5 |
32.2 |
22.1 |
32.5 |
23.5 |
||||||||||||||||
|
2007 |
31.2 |
20.0 |
31.0 |
21.9 |
31.3 |
21.1 |
31.8 |
22.7 |
||||||||||||||||
|
2008 |
31.1 |
20.1 |
30.5 |
22.0 |
30.0 |
20.2 |
31.8 |
22.5 |
||||||||||||||||
|
2009 |
32.6 |
20.2 |
31.9 |
22.4 |
30.3 |
20.9 |
32.4 |
23.2 |
||||||||||||||||
| 2010 | 33.4 | 20.7 | 32.2 | 22.9 | 32.3 | 21.3 | 33.1 | 23.9 | ||||||||||||||||
| 2011 | 31.4 | 20.1 | 30.8 | 22.4 | 30.7 | 20.6 | 31.9 | 22.6 | ||||||||||||||||
Source: Meteorology Department, MAF
Humidity
Average Maximum and Minimum Humidity by Year
Unit : percent
|
Year |
Weather Station |
|||||||||||
|
Luangprabang |
Vientiane.Capital |
Savannakhet |
Pakse |
|||||||||
|
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
|||||
|
1976 |
97.0 |
48.0 |
90.0 |
51.0 |
85.0 |
45.0 |
90.0 |
52.0 |
||||
|
1980 |
96.0 |
46.0 |
89.0 |
52.0 |
96.0 |
55.0 |
89.0 |
53.0 |
||||
|
1985 |
97.0 |
52.0 |
92.0 |
56.0 |
95.0 |
55.0 |
90.0 |
56.0 |
||||
|
1990 |
93.0 |
60.0 |
90.0 |
55.0 |
91.0 |
51.0 |
89.0 |
53.0 |
||||
|
1995 |
97.0 |
51.0 |
91.0 |
54.0 |
95.0 |
54.0 |
84.0 |
54.0 |
||||
|
1996 |
97.0 |
48.0 |
91.0 |
48.0 |
94.0 |
51.0 |
81.0 |
52.0 |
||||
|
1997 |
98.0 |
51.0 |
91.0 |
55.0 |
95.0 |
50.0 |
85.0 |
53.0 |
||||
|
1998 |
97.0 |
52.0 |
90.0 |
50.0 |
92.0 |
52.0 |
83.0 |
53.0 |
||||
|
1999 |
96.0 |
59.0 |
91.0 |
57.0 |
89.0 |
54.0 |
88.0 |
54.0 |
||||
|
2000 |
95.0 |
51.0 |
92.0 |
54.0 |
90.0 |
54.0 |
87.0 |
55.0 |
||||
|
2001 |
95.0 |
51.0 |
92.0 |
55.0 |
87.0 |
54.0 |
87.0 |
52.0 |
||||
|
2002 |
96.0 |
55.0 |
92.0 |
55.0 |
93.0 |
58.0 |
84.0 |
52.0 |
||||
|
2003 |
96.0 |
75.0 |
91.0 |
72.0 |
95.0 |
75.0 |
87.0 |
70.0 |
||||
|
2004 |
96.0 |
54.5 |
91.5 |
53.7 |
94.0 |
55.3 |
86.0 |
52.0 |
||||
|
2005 |
95.5 |
55.3 |
89.6 |
53.9 |
93.7 |
58.1 |
85.9 |
55.3 |
||||
|
2006 |
95.0 |
57.0 |
92.0 |
54.0 |
94.0 |
58.0 |
87.0 |
54.0 |
||||
|
2007 |
97.0 |
52.0 |
91.0 |
52.0 |
92.0 |
51.0 |
88.0 |
52.0 |
||||
|
2008 |
96.0 |
56.0 |
92.0 |
58.0 |
96.0 |
59.0 |
87.0 |
56.0 |
||||
|
2009 |
95.0 |
50.7 |
90.0 |
55.3 |
96.1 |
59.3 |
87.8 |
54.4 |
||||
| 2010 | 95 | 49 | 90 | 55 | 94 | 56 | 85 | 53 | ||||
| 2011 | 96 | 54 | 90 | 58 | 94 | 59 | 86 | 55 | ||||
Source: Meteorology Department, MAF
Sunshine
Number of Sunny Hours by Year
Unit: Hours
|
Year |
Weather Station |
|||
|
Luangprabang |
Vientiane. Capital |
Savannakhet |
Pakse |
|
|
1976 |
2 345.1 |
- |
2 559.4 |
2 572.0 |
|
1980 |
1 776.2 |
- |
2 334.6 |
2 626.8 |
|
1985 |
1 817.9 |
2 378.9 |
2 378.9 |
1 176.7 |
|
1990 |
1 658.0 |
1 623.0 |
- |
- |
|
1995 |
2 155.4 |
2 298.4 |
- |
2 448.6 |
|
1996 |
1 994.0 |
2 793.0 |
2 356.0 |
2 423.0 |
|
1997 |
2 013.5 |
2 567.7 |
2 449.5 |
2 615.1 |
|
1998 |
2 178.6 |
2 503.0 |
2 522.8 |
2 565.8 |
|
1999 |
1 871.5 |
2 028.6 |
1 989.6 |
2 096.2 |
|
2000 |
2 020.1 |
2 358.4 |
2 233.4 |
2 342.9 |
|
2001 |
1 866.0 |
2 359.9 |
2 269.0 |
2 461.0 |
|
2002 |
1 686.0 |
2 344.0 |
2 359.0 |
2 476.0 |
|
2003 |
2 361.0 |
2 787.0 |
2 572.0 |
2 466.0 |
|
2004 |
1 771.5 |
2 371.2 |
2 428.3 |
2 455.2 |
|
2005 |
1 723.2 |
2 278.1 |
2 105.5 |
2 240.9 |
|
2006 |
1 728.7 |
2 389.2 |
2 253.1 |
2 334.9 |
|
2007 |
2 104.1 |
2 511.0 |
2 281.6 |
2 465.9 |
|
2008 |
1 931.1 |
2 322.8 |
2 245.5 |
2 255.5 |
|
2009 |
2,141.8 |
2,630.7 |
2,245.5 |
2,340.7 |
| 2010 | 2 277.5 | 2 509.0 | 2 381.3 | 2 463.2 |
| 2011 | 1 920.3 | 2 343.8 | 2 118.9 | 2 165.3 |
Source: Department of Meteorology and Hydrology, Water Resources and Environment Administration
Rainfall
Rainfall by Year
Unit: mm
|
Weather Station |
||||
|
Year |
Luangprabang |
Vientiane. Capital |
Savannakhet |
Pakse |
|
1976 |
1 466.2 |
1 614.9 |
1 604.2 |
1 751.0 |
|
1980 |
1 559.5 |
2 291.4 |
1 635.6 |
1 524.5 |
|
1985 |
1 093.4 |
1 253.5 |
1 205.1 |
2 545.2 |
|
1990 |
1 641.6 |
1 552.1 |
1 713.5 |
1 704.0 |
|
1995 |
1 616.9 |
2 019.8 |
1 342.3 |
1 647.5 |
|
1996 |
1 601.0 |
1 756.0 |
1 938.0 |
2 193.0 |
|
1997 |
1 180.0 |
1 629.6 |
1 335.2 |
2 604.4 |
|
1998 |
1 163.7 |
1 477.4 |
1 080.4 |
1 733.5 |
|
1999 |
1 352.6 |
2 170.7 |
2 357.1 |
2 446.6 |
|
2000 |
1 486.7 |
1 499.8 |
1 557.8 |
2 598.4 |
|
2001 |
1 795.0 |
1 659.0 |
1 919.9 |
2 348.6 |
|
2002 |
1 601.8 |
1 846.7 |
1 982.0 |
2 478.0 |
|
2003 |
1 399.0 |
1 481.0 |
1 492.3 |
2 029.1 |
|
2004 |
1 472.7 |
1 629.6 |
396.7 |
1 977.9 |
|
2005 |
1 435.0 |
1 667.8 |
1 768.2 |
1 956.1 |
|
2006 |
1 205.6 |
1 930.3 |
1 398.7 |
2 694.5 |
|
2007 |
1 295.0 |
1 667.5 |
1 444.7 |
1 967.5 |
|
2008 |
1 708.7 |
2 201.6 |
1 565.7 |
1 907.6 |
|
2009 |
1 259.4 |
1 482.8 |
1 565.7 |
2 209.6 |
| 2010 | 1 368.6 | 1 794.2 | 1 658.9 | 1 464.3 |
| 2011 | 2 233.5 | 2 202.4 | 1 717.9 | 2 182.5 |
Source: Department of Meteorology and Hydrology, Water Resources and Environment Administration
Luangprabang
Table 10
Normal Meteorology 2011
Station: Luangprabang
|
Symbol |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
|
Tx |
27.6 |
33.1 |
30.7 |
33.7 |
33.2 |
32.5 |
32.7 |
32.2 |
32.3 |
32.0 |
29.7 |
26.9 |
31.4 |
|
Tn |
12.9 |
15.7 |
17.7 |
21.2 |
23.2 |
23.7 |
23.9 |
23.7 |
23.8 |
21.3 |
17.3 |
14.7 |
20.1 |
|
(Tx+Tn)/2 |
21.2 |
24.4 |
24.2 |
27.4 |
28.2 |
28.1 |
28.3 |
28.0 |
28.1 |
26.6 |
23.5 |
20.8 |
25.7 |
|
Ux |
96 |
95 |
93 |
95 |
96 |
96 |
96 |
97 |
96 |
96 |
96 |
96 |
96 |
|
Un |
49 |
35 |
44 |
50 |
59 |
68 |
63 |
64 |
64 |
55 |
53 |
50 |
54 |
|
(Ux+Un)/2 |
73 |
65 |
69 |
72 |
77 |
82 |
80 |
80 |
80 |
76 |
75 |
73 |
75 |
|
R |
6.7 |
0.0 |
121.6 |
127.0 |
272.3 |
520.2 |
291.1 |
532.5 |
269.1 |
83.8 |
9.2 |
0.0 |
2 233.5 |
|
Sun |
166.5 |
219.1 |
164.7 |
153.8 |
158.8 |
113.6 |
134.8 |
133.3 |
127.1 |
189.0 |
189.0 |
170.6 |
1 920.3 |
Source: Department of Meteorology and Hydrology, Water Resources and Environment Administration
(Tx+Tn)/2= Mean temperature in oc
Tx = Mean maximum temperature in oc
Tn = Mean minimum temperature in oc
(Ux+Un)/2 = Mean humidity of air in %
Ux = Mean maximum humidity of air in %
Un = Mean minimum humidity of air in %
R = Total rainfall in mm
Sun = Total sunshine duration in hours
Vientiane
Table 09
Normal Meteorology 2011
Station: Vientiane Capital
|
Symbol |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
|
Tx |
27.3 |
30.9 |
29.2 |
33.6 |
32.9 |
31.7 |
31.5 |
31.2 |
31.3 |
30.9 |
31.4 |
28.1 |
30.8 |
|
Tn |
16.3 |
19.9 |
20.3 |
24.2 |
25.0 |
25.5 |
25.3 |
24.9 |
24.8 |
23.8 |
21.2 |
17.4 |
22.4 |
|
(Tx+Tn)/2 |
21.8 |
25.4 |
24.7 |
28.9 |
29.0 |
28.6 |
28.4 |
28.1 |
28.0 |
27.3 |
26.3 |
22.8 |
26.6 |
|
Ux |
88 |
88 |
84 |
85 |
93 |
94 |
95 |
95 |
95 |
91 |
91 |
85 |
90 |
|
Un |
51 |
45 |
50 |
50 |
61 |
67 |
68 |
71 |
68 |
62 |
50 |
48 |
58 |
|
(Ux+Un)/2 |
70 |
66 |
67 |
67 |
77 |
81 |
82 |
83 |
82 |
77 |
71 |
67 |
74 |
|
R |
1.6 |
2.2 |
88.6 |
23.9 |
282.1 |
328.3 |
464.4 |
382.2 |
466.8 |
156.9 |
5.4 |
0.0 |
2 202.4 |
|
Sun |
272.6 |
214.0 |
201.2 |
222.5 |
211.3 |
134.1 |
147.0 |
120.3 |
127.2 |
183.5 |
266.7 |
243.4 |
2 343.8 |
Source : Department of Meteorology and Hydrology, Water Resources and Environment Administration
Remark:
(Tx+Tn)/2= Mean temperature in oc
Tx = Mean maximum temperature in oc
Tn = Mean minimum temperature in oc
(Ux+Un)/2 = Mean humidity of air in %
Ux = Mean maximum humidity of air in %
Un = Mean minimum humidity of air in %
R = Total rainfall in mm
Sun = Total sunshine duration in hours
Savannakhet
Table 11
Normal Meteorology 2011
Station: Savannakhet
|
Symbol |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
|
Tx |
27.5 |
31.6 |
30.3 |
34.2 |
34.0 |
32.0 |
31.6 |
30.6 |
29.6 |
29.6 |
30.4 |
27.2 |
30.7 |
|
Tn |
13.7 |
16.6 |
17.2 |
21.8 |
24.5 |
24.7 |
24.2 |
24.3 |
24.1 |
21.3 |
19.6 |
14.7 |
20.6 |
|
(Tx+Tn)/2 |
20.6 |
24.1 |
23.8 |
28.0 |
29.3 |
28.3 |
27.9 |
27.4 |
26.9 |
25.5 |
25.0 |
21.0 |
25.6 |
|
Ux |
94 |
94 |
92 |
91 |
92 |
94 |
95 |
96 |
96 |
94 |
97 |
94 |
94 |
|
Un |
46 |
43 |
49 |
46 |
53 |
70 |
71 |
74 |
77 |
66 |
57 |
52 |
59 |
|
(Ux+Un)/2 |
70 |
68 |
70 |
68 |
73 |
82 |
83 |
85 |
87 |
80 |
77 |
73 |
76 |
|
R |
0.0 |
16.8 |
6.2 |
15.7 |
143.1 |
349.0 |
345.4 |
551.2 |
214.6 |
75.9 |
0.0 |
0.0 |
1 717.9 |
|
Sun |
260.8 |
217.8 |
155.3 |
186.0 |
192.0 |
132.6 |
148.4 |
125.1 |
58.5 |
167.9 |
238.2 |
236.3 |
2 118.9 |
Source : Department of Meteorology and Hydrology, Water Resources and Environment Administration
Remark:
(Tx+Tn)/2= Mean temperature in oc
Tx = Mean maximum temperature in oc
Tn = Mean minimum temperature in oc
(Ux+Un)/2 = Mean humidity of air in %
Ux = Mean maximum humidity of air in %
Un = Mean minimum humidity of air in %
R = Total rainfall in mm
Sun = Total sunshine duration in hours
Pakse
Table 12
Normal Meteorology 2011
Station: Pakse
|
Symbol |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
|
Tx |
31.3 |
33.6 |
34.1 |
35.4 |
32.9 |
31.4 |
31.0 |
30.6 |
29.1 |
31.1 |
32.0 |
30.1 |
31.9 |
|
Tn |
17.4 |
21.6 |
21.7 |
24.8 |
25.1 |
25.1 |
24.7 |
24.1 |
24.0 |
23.2 |
21.5 |
18.4 |
22.6 |
|
(Tx+Tn)/2 |
24.4 |
27.6 |
27.9 |
30.1 |
29.0 |
28.2 |
27.8 |
27.4 |
26.6 |
27.2 |
26.8 |
24.2 |
27.3 |
|
Ux |
79 |
75 |
67 |
81 |
90 |
92 |
92 |
94 |
95 |
92 |
87 |
82 |
86 |
|
Un |
36 |
37 |
35 |
44 |
60 |
68 |
69 |
71 |
78 |
63 |
50 |
45 |
55 |
|
(Ux+Un)/2 |
58 |
56 |
51 |
62 |
75 |
80 |
81 |
82 |
86 |
77 |
69 |
64 |
70 |
|
R |
0.0 |
5.3 |
3.8 |
0.0 |
289.7 |
313.3 |
275.8 |
402.7 |
626.4 |
238.7 |
26.8 |
0.0 |
2182.5 |
|
Sun |
264.1 |
217.2 |
202.3 |
207.0 |
225.9 |
131.3 |
127.0 |
123.3 |
43.9 |
143.4 |
244.4 |
235.5 |
2165.3 |
Source : Department of Meteorology and Hydrology, Water Resources and Environment Administration
Remark:
(Tx+Tn)/2= Mean temperature in oc
Tx = Mean maximum temperature in oc
Tn = Mean minimum temperature in oc
(Ux+Un)/2 = Mean humidity of air in %
Ux = Mean maximum humidity of air in %
Un = Mean minimum humidity of air in %
R = Total rainfall in mm
Sun = Total sunshine duration in hours