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Monthly Climatological Normals for Hong Kong
Climatological Information Services > Climatological Normals and Extremes > 1961-1990 Normals for Hong Kong (Grouped by element)

Monthly Climatological Normals for Hong Kong 

  1. Monthly mean numbers of days with tropical cyclone warning signals and Strong Monsoon Signal in Hong Kong between 1961-1990
  2. Monthly mean of rainfall in Hong Kong between 1961-1990
  3. Monthly mean numbers of days with lightning, thunderstorm and fog reported at the Observatory between 1961-1990
  4. Monthly means of daily maximum, mean and minimum temperature recorded at the Observatory between 1961-1990
  5. Monthly means of relative humidity, dew point temperature, wet-bulb temperature and vapour pressure recorded at the Observatory between 1961-1990
  6. Monthly means of cloud amount observed at the Observatory and sunshine duration and daily global solar radiation recorded at King's Park between 1961-1990
  7. Monthly means of prevailing wind direction and mean wind speed recorded at the Observatory and Waglan Island between 1961-1990
  8. Monthly mean of atmospheric pressure recorded at the Observatory between 1961-1990
  9. Monthly means of sea surface temperature recorded at North Point and Waglan Island, and evaporation and potential evapotranspiration recorded at King's Park between 1961-1990
  10. Monthly mean of soil temperature recorded at the Observatory between 1967-1996


 

Table 1.   Monthly mean numbers of days with tropical cyclone warning signals and Strong Monsoon Signal in Hong Kong between 1961-1990
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Month
Number of Days with
Tropical Cyclone Warning Signal
Number of Days with
Strong Monsoon Signal
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No. 1 and/or
higher
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No. 3 and/or
higher
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No. 8 and/or
higher
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No. 9 and/or
No. 10
January - - - - 2.77
February - - - - 3.17
March - - - - 2.60
April 0.17 - - - 2.37
May 0.70 0.50 0.13 0.03 1.13
June 1.97 0.93 0.13 - 0.93
July 4.57 2.93 0.67 0.07 0.30
August 3.33 1.70 0.53 0.17 0.17
September 4.50 2.50 0.57 0.10 1.17
October 3.37 2.40 0.30 0.10 3.80
November 0.50 0.30 0.07 - 3.27
December 0.07 0.07 - - 3.97
Year 19.17 11.33 2.40 0.47 25.63

Figure 1.1. Monthly mean number of days with tropical cyclone warning signals in Hong Kong between 1961-1990

Figure 1.1.   Monthly mean number of days with tropical cyclone warning signals in Hong Kong between 1961-1990

Figure 1.2. Monthly mean number of days with Strong Monsoon Signal in Hong Kong between 1961-1990

Figure 1.2.    Monthly mean number of days with Strong Monsoon Signal in Hong Kong between 1961-1990

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Table 2.   Monthly mean of rainfall in Hong Kong between 1961-1990
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Month
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Total
(mm)
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Duration
(hours)
Number of Days with
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0.1 mm
or more
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25 mm
or more
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50 mm
or more
January 23.4 41 5.63 0.10 0.00
February 48.0 69 8.93 0.43 0.03
March 66.9 89 10.07 0.60 0.27
April 161.5 82 11.13 2.20 0.97
May 316.7 92 14.93 3.40 1.93
June 376.0 86 19.23 4.23 1.97
July 323.5 67 17.47 3.93 1.97
August 391.4 73 17.30 4.70 2.17
September 299.7 68 14.37 3.57 1.63
October 144.8 48 8.60 1.50 0.87
November 35.1 37 5.87 0.40 0.10
December 27.3 31 3.87 0.23 0.10
Year 2214.3 782 137.40 25.30 12.00

Figure 2. Monthly mean of rainfall in Hong Kong between 1961-1990

Figure 2.   Monthly mean of rainfall in Hong Kong between 1961-1990

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Table 3.   Monthly mean numbers of days with lightning, thunderstorm and fog reported at the Observatory between 1961-1990
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Month
Number of Days with
Lightning
Number of Days with
Thunderstorm
Number of Days with Fog
(Visibility < 1000 m)
January 0.17 0.10 0.43
February 0.63 0.60 1.27
March 1.93 1.83 2.37
April 4.40 4.00 1.67
May 6.30 4.80 0.13
June 7.27 5.20 -
July 7.10 5.03 -
August 10.17 6.93 -
September 6.67 3.93 -
October 1.23 0.87 -
November 0.17 0.17 -
December - - -
Year 46.03 33.47 5.87

Figure 3. Monthly mean numbers of days with lightning, thunderstorm and fog reported at the Observatory between 1961-1990

Figure 3.    Monthly mean numbers of days with lightning, thunderstorm and fog reported at the Observatory between 1961-1990

 

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Table 4.   Monthly means of daily maximum, mean and minimum temperature recorded at the Observatory between 1961-1990
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Month
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Mean Daily
Maximum
(deg. C)
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Mean
(deg. C)
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Mean Daily
Minimum
(deg. C)
January 18.6 15.8 13.6
February 18.6 15.9 13.9
March 21.3 18.5 16.5
April 24.9 22.2 20.2
May 28.7 25.9 23.9
June 30.3 27.8 25.9
July 31.5 28.8 26.6
August 31.3 28.4 26.3
September 30.3 27.6 25.5
October 27.9 25.2 23.1
November 24.2 21.4 19.2
December 20.5 17.6 15.4
Year 25.7 23.0 20.9

Figure 4. Monthly means of daily maximum, mean and minimum temperature recorded at the Observatory between 1961-1990

Figure 4.   Monthly means of daily maximum, mean and minimum temperature recorded at the Observatory between 1961-1990

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Table 5.   Monthly means of relative humidity, dew point temperature, wet-bulb temperature and vapour pressure recorded at the Observatory between 1961-1990
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Month
Relative Humidity (%)  Dew Point 
Temperature
(deg. C)
Wet-bulb
Temperature
(deg. C)
Vapour
 Pressure 
(hPa)
    Mean     Mean at
0200 hours
Mean at
1400 hours
January 71 76 62 10.2 13.0 13.1
February 78 82 70 11.8 13.8 14.5
March 81 85 73 15.0 16.5 17.6
April 83 88 75 19.0 20.2 22.4
May 83 87 76 22.6 23.7 27.7
June 82 86 76 24.4 25.4 30.7
July 80 85 73 24.9 26.0 31.6
August 81 86 74 24.8 25.9 31.4
September 78 83 71 23.3 24.6 28.8
October 73 78 66 19.8 21.8 23.6
November 69 74 61 15.2 17.9 18.0
December 68 73 59 11.2 14.3 14.1
Year 77 82 70 18.6 20.3 22.8

Figure 5.1. Monthly mean of relative humidity recorded at the Observatory between 1961-1990

Figure 5.1.    Monthly mean of relative humidity recorded at the Observatory between 1961-1990

Figure 5.2. Monthly means of dew point temperature, web-bulb temperature and vapour pressure recorded at the Observatory between 1961-1990

Figure 5.2.    Monthly means of dew point temperature, web-bulb temperature and vapour pressure recorded at the Observatory between 1961-1990

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Table 6.   Monthly means of cloud amount observed at the Observatory and sunshine duration and daily global solar radiation recorded at King's Park
 between 1961-1990
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Month
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Cloud Amount
(%)
Bright Sunshine blank space
Daily Global
Solar Radiation
(MJ/m2)
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Duration
(hours)
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Percentage
of Possible
January 58 152.4 45 11.63
February 73 97.7 30 10.69
March 76 96.4 26 11.24
April 78 108.9 29 13.14
May 74 153.8 38 16.12
June 75 161.1 40 16.55
July 65 231.1 56 19.15
August 66 207.0 52 17.61
September 63 181.7 49 16.49
October 56 195.0 54 15.46
November 53 181.5 55 13.39
December 49 181.5 54 12.03
Year 65 1948.1 44 14.46

Monthly mean of cloud amount recorded at the Observatory between 1961-1990

Figure 6.1.    Monthly mean of cloud amount recorded at the Observatory between 1961-1990

Figure 6.2.    Monthly mean of sunshine duration recorded at King's Park between 1961-1990

Figure 6.2.    Monthly mean of sunshine duration recorded at King's Park between 1961-1990

Figure 6.3.    Monthly mean of daily global solar radiation recorded at King's Park between 1961-1990

Figure 6.3.    Monthly mean of daily global solar radiation recorded at King's Park between 1961-1990

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Table 7.   Monthly means of prevailing wind direction and mean wind speed recorded at the Observatory and Waglan Island between 1961-1990
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Month
Observatory Waglan Island
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Prevailing
Direction
(deg.)
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Mean Wind
Speed (km/h)
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Prevailing
Direction
(deg.)
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Mean Wind
Speed (km/h)
January 090 11.2 070 24.0
February 090 11.9 070 23.8
March 090 12.6 070 22.1
April 090 11.7 080 19.7
May 090 10.6 090 19.2
June 090 10.4 090 21.6
July 090 10.1 230 20.0
August 090 9.4 090 18.5
September 090 10.7 090 21.9
October 090 12.2 090 27.6
November 090 11.0 080 27.2
December 090 10.5 080 25.5
Year 090 11.0 080 22.6

Figure 7. Monthly means of prevailing wind direction and mean wind speed recorded at the Observatory and Waglan Island between 1961-1990

Figure 7.   Monthly means of prevailing wind direction and mean wind speed recorded at the Observatory and Waglan Island between 1961-1990

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Table 8.   Monthly mean of atmospheric pressure recorded at the Observatory between
1961-1990
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Month
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Mean (hPa)
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Mean Diurnal
Range (hPa)
January 1020.2 4.1
February 1018.7 4.1
March 1016.2 4.2
April 1013.1 3.8
May 1009.1 3.4
June 1006.0 3.0
July 1005.3 3.4
August 1005.1 3.5
September 1008.8 3.6
October 1014.0 3.6
November 1017.9 3.8
December 1020.2 4.0
Year 1012.9 3.7

Figure8. Monthly mean of atmospheric pressure recorded at the Observatory between 1961-1990

Figure8.   Monthly mean of atmospheric pressure recorded at the Observatory between 1961-1990

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Table 9.   Monthly means of sea surface temperature recorded at North Point and Waglan Island, and evaporation and potential evapotranspiration recorded at King's Park between 1961-1990
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Month
Sea Surface Temperature (deg. C) Evaporation
(mm)
Potential
Evapotranspiration
(mm)
North Point * Waglan Island
 0700 hours   1400 hours  0700 or
 1100 hours 
1400 or
 1700 hours 
January 17.5 17.7 17.1 17.3 97.5 73.2
February 16.7 17.0 16.3 16.4 79.0 66.3
March 17.9 18.2 17.3 17.5 92.2 77.0
April 20.9 21.3 20.3 20.5 106.9 92.0
May 24.5 25.0 24.5 24.8 137.7 115.0
June 26.5 26.9 26.6 26.9 143.9 126.6
July 26.6 27.1 27.4 27.7 171.6 150.5
August 26.5 27.0 27.3 27.6 156.9 135.8
September 27.1 27.5 27.4 27.7 150.3 120.6
October 26.3 26.6 26.3 26.5 152.2 112.8
November 23.4 23.6 23.4 23.5 129.1 88.8
December 19.8 20.0 19.5 19.7 111.5 76.7
Year 22.8 23.2 22.8 23.0 1528.8 1235.0

*   1975 - 2004

Figure9.1. Monthly means of sea surface temperature recorded at North Point between 1975-2004 and Waglan Island between 1961-1990

Figure9.1.   Monthly means of sea surface temperature recorded at North Point between 1975-2004 and Waglan Island between 1961-1990

Figure9.2. Monthly means of evaporation and potential evapotranspiration recorded at King's Park between 1961-1990

 

Figure9.2.   Monthly means of evaporation and potential evapotranspiration recorded at King's Park between 1961-1990

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Table 10.   Monthly mean of soil temperature recorded at the Observatory between 1967-1996
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Month
0.5 m 1.0 m 1.5 m
 0700 hours 
(deg. C)
 1900 hours 
(deg. C)
 0700 hours 
(deg. C)
 1900 hours 
(deg. C)
 0700 hours 
(deg. C)
 1900 hours 
(deg. C)
January 18.9 18.9 20.5 20.6 21.7 21.7
February 18.8 18.9 19.9 20.0 20.9 20.9
March 20.4 20.5 20.7 20.7 21.1 21.1
April 23.1 23.3 22.6 22.6 22.4 22.4
May 26.5 26.7 25.5 25.5 24.8 24.8
June 28.4 28.6 27.5 27.6 26.8 26.8
July 29.9 30.0 29.0 29.1 28.3 28.3
August 30.0 30.1 29.5 29.5 29.0 29.0
September 29.6 29.7 29.4 29.4 29.1 29.1
October 27.6 27.6 28.1 28.1 28.2 28.2
November 24.4 24.4 25.7 25.6 26.4 26.3
December 20.6 20.6 22.5 22.5 23.7 23.7
Year 24.9 24.9 25.1 25.1 25.2 25.2

Monthly mean of soil temperature recorded at the Observatory between 1967-1996

Figure10.    Monthly mean of soil temperature recorded at the Observatory between 1967-1996

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Last revision date: <23 Mar 2015>