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  Weather Statistics


Rainfall
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Period of Record
Mean monthly Total (mm) 244.0 161.7 184.5 178.7 171.6 162.2 158.3 176.2 170.2 194.3 255.5 288.9 1868-2010
(142yrs)

Highest Monthly Total (mm) 818.6
1893
566.7
1910
528.3
1913
454.9
1900
386.6
1892
378.7
1954
527.3
1890
526.3
1878
440.4
1988
497.1
1942
521.5
1874
765.9
2006
Lowest Monthly Total (mm) 15.4
1997

 

6.3
2010

 

18.5
1912
16.6
1977
41.6
1997
21.8
2009
18.6
1997
18
1888
23.7
1994
10.8
2002
53
1981
62.5
1932
Highest 1 day Total (mm) 194.4
31
2003
159.3
04
1995
122.8
08
2004
102.4
27
2007
153.7
04
1990
121.1
05
1984
149.1
27
1941
133.9
7
2008
187.3
21
1988
91.4
08
1952
198.6
02
1995
512.4
02
1978
Mean Raindays 15 11 14 15 14 13 13 14 14 16 19 19 1891-2010
(120yrs)
Maximum Raindays 26
1927
24
1964
23
1945
23
1970
23
1991
26
1899
20
several
23
1936
22
1986
23
several
24
several
26
several
Minimum Raindays 3
1976
1
1983
3
1983
3
1963
6
1997
4
1981
6
several
5
1941
1961
3
1997
5
1991
11
1998
8
1920

TEMPERATURE (°C)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Period of Record
Mean Daily Maximum 30.1 31.1 31.5 31.7 31.6 31.3 30.9 30.9 30.9 31.1 30.6 29.9 1929 - 1941 1948 - 2008
( 74 yrs)

Mean Daily Minimum 23.2 23.5 23.9 24.4 24.7 24.7 24.5 24.4 24.2 24.0 23.7 23.4
24-hr Mean 25.9 26.5 26.9 27.3 27.7 27.7 27.4 27.3 27.1 27.0 26.4 25.9
Highest Temperature 33.6
27
1998
35.2
26
2010
36
26
1998
35.8
19
1983
35.4
01
2005

35
25
1985

34
17 1991 17 1997
34.2
17 1986
34.3
15
2000
34.6
29
2002
34.3
17
1982
33.5
16
2005
1984 - Mar 2009
(26 yrs)
Lowest Temperature 21.2
28
1984
21.1
02
1984
20.2
14
2000
21.7
12
1993
21.2
04
1989
21.1
19
1992
20.5
03
1990
21.1
15
1990
21
10
1984
21.1
06
1989
21.3
28
1983
21.9
02 1983
25
1983

RELATIVE HUMIDITY (%)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Period of Record
Mean Daily Maximum 95.9 95.8 96.4 96.9 96.4 95.6 95.0 95.1 95.9 96.5 97.1 96.8 1929 - 1941 1948 - 2008
( 74 yrs)

Mean Daily Minimum 65.6 61.3 62.0 63.4 64.7 64.2 64.8 64.5 63.9 63.2 66.1 68.2
24-hr Mean 84.8 83.0 83.8 84.8 84.4 83.0 82.8 83.0 83.5 84.1 86.4 86.9
Lowest Minimum 48
15
1997
38
28
1990
39
06 1990 30 1990
39
19
1983

45
10 1990
19 2003

36
20
2003
38
27
1982
40
17
1986
37
14
1994
40
07
1991
43
02
1996
49
02
2007
1984 - 2009
(25 yrs)

SURFACE WIND
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Period of Record
Mean Wind Direction N/NE N/NE N/NE Variable S/SE S/SE S/SE S/SE S/SE Variable Variable N/NE 1935 - 1941 1948 - 2008
( 68 yrs)

Mean Daily Wind Speed (m/s) 2.4 2.4 1.8 1.3 1.3 1.6 1.9 1.9 1.6 1.3 1.3 1.8
Highest 10 minutes
Mean Wind Speed (m/s)
12.2
6
1986
12.4
17
1977
14.2
3
1986
13.4
11
1981
13.9
6
1976
12.4
20
1978
15.4
5
1975
13.9
6
1979
13.9
19
1980
12.4
26
1976
13.8
10
1976
11.1
17
1981
1975 - 2008
(34 yrs)

THUNDERSTORM, LIGHTNING
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Period of Record
Mean Thunderstorm Days 5 5 12 19 19 15 14 13 15 18 19 12 1982 - 2008
(27 yrs
)
Maximum Thunderstorm Days 13
2001
14
2000
23
2000
26
several
24
2001
21
1999
23
2004
20
1996
20
1986
1996
24
1993
26
1982
22
2000
Minimum Thunderstorm Days 0
several
0
several
3
1990
10
1990
10
2003
9
1982
4
1994
5
1988
4
1994
7
2006
14
1991
4
1986
Mean Lightning Days 6 5 14 22 22 17 14 12 14 20 24 16
Maximum Lightning Days 14
2000
14
1988
23
1985
28
1982
2003
29
1983
24
1988
25
1985
23
1996
24
1984
28
2001
29
1982
27
2002
Minimum Lightning Days 0
1986
1
several
2
1983
9
1983
13
2003
10
2004
1
1994
2
1997
0
1997
2
2006
14
2004
6
1983

Weather records from a climate station are compiled over long periods for the purpose of determining climatic trends. For this purpose, NEA uses the Changi climate station as a reference point.

 

 
   
 
 

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