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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
OCTOBER 2017 (Table 1)

Date
October
Mean Pressure
(hPa)
Air   Temperature Mean
Dew Point
Temperature
(deg. C)
Mean
Relative
Humidity
(%)
Mean
Amount
of Cloud
(%)
Total
Rainfall
(mm)
Maximum
(deg. C)
Mean
(deg. C)
Minimum
(deg. C)
1 1011.7 30.1 28.4 27.6 25.9 86 80 6.6
2 1011.1 32.7 29.2 26.4 26.0 83 66 3.6
3 1012.3 33.5 30.1 28.3 25.8 78 52 -
4 1014.0 31.0 28.7 27.5 25.3 82 76 9.5
5 1013.3 30.3 28.5 27.5 23.8 76 76 Trace
6 1013.1 31.1 28.9 27.4 23.9 75 83 0.2
7 1013.0 31.7 29.3 27.9 24.2 74 76 -
8 1011.8 31.5 28.9 27.3 23.9 75 82 -
9 1010.1 30.9 29.4 28.1 23.6 71 85 Trace
10 1010.8 32.3 29.8 28.6 24.5 74 69 Trace
11 1011.2 32.5 29.8 28.3 24.4 73 43 0.2
12 1009.9 32.7 29.5 27.6 23.1 69 69 -
13 1007.9 30.6 27.0 24.5 19.5 64 59 -
14 1004.5 25.6 24.5 21.9 18.1 68 88 0.4
15 1000.3 26.9 23.3 20.4 21.3 89 89 20.7
16 1008.1 27.5 26.7 25.6 25.0 91 88 17.1
17 1012.2 27.6 25.8 24.7 23.4 87 89 41.3
18 1013.0 29.5 26.2 24.0 21.1 74 67 Trace
19 1011.9 27.9 25.4 23.4 19.7 71 70 -
20 1012.1 27.8 24.1 22.3 18.1 69 72 -
21 1012.1 27.2 23.6 21.6 16.2 64 33 -
22 1012.4 26.3 22.9 20.2 14.7 60 9 -
23 1015.6 27.7 23.7 20.8 15.9 62 6 -
24 1018.5 27.3 24.4 22.5 17.3 65 14 -
25 1018.8 26.4 24.1 22.7 18.1 69 18 Trace
26 1016.3 28.1 24.4 22.1 18.7 71 18 -
27 1013.9 28.6 24.9 22.1 16.4 60 40 -
28 1014.8 28.0 24.8 22.5 14.9 54 21 -
29 1018.0 27.0 24.1 21.7 13.9 53 31 -
30 1020.9 25.0 22.7 20.5 13.0 55 55 Trace
31 1019.7 25.0 22.0 19.0 14.1 61 51 Trace
Mean/Total 1012.7 29.0 26.3 24.4 20.4 71 57 99.6
Normal* 1014.1 27.8 25.5 23.7 20.2 73 58 100.9
Station Hong   Kong   Observatory

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
OCTOBER 2017 (Table 2)

Date
October
Number of hours
of Reduced
Visibility#
(hours)
Total
Bright
Sunshine
(hours)
Daily
Global Solar
Radiation
(MJ/m2)
Total
Evaporation
(mm)
Prevailing
Wind
Direction
(degrees)
Mean
Wind
Speed
(km/h)
1 0 2.9 11.23 3.3 090 28.5
2 0 8.7 20.73 4.0 090 21.6
3 0 9.7 21.62 4.6 090 18.3
4 0 2.4 9.90 5.7 080 35.7
5 0 6.7 15.27 3.2 070 38.8
6 0 8.9 18.67 4.3 070 36.4
7 0 8.5 18.83 4.5 070 39.7
8 0 6.8 15.49 4.0 070 36.8
9 0 3.8 11.57 3.4 070 53.3
10 0 9.0 17.68 4.1 070 38.9
11 0 10.4 22.74 4.6 070 31.9
12 0 8.4 19.55 5.9 080 24.8
13 0 10.7 22.15 6.1 360 34.8
14 0 - 5.82 3.0 350 51.5
15 0 0.3 6.11 0.4 360 65.7
16 0 1.5 7.80 1.9 070 42.3
17 0 0.6 6.53 1.9 060 44.6
18 0 9.6 19.99 4.5 360 25.2
19 0 5.0 12.95 3.8 350 33.5
20 0 4.6 14.30 4.0 360 34.4
21 0 10.5 20.54 4.7 360 33.3
22 0 10.4 19.85 4.0 350 24.7
23 0 7.4 16.21 3.0 360 22.5
24 0 10.2 19.57 2.8 070 29.1
25 0 10.0 19.30 3.7 070 32.3
26 0 10.3 18.61 4.1 070 15.2
27 0 10.5 18.94 4.9 360 10.2
28 0 10.2 18.85 5.4 360 18.5
29 0 10.3 18.88 6.0 360 31.9
30 0 10.2 18.20 4.5 360 30.7
31 0 10.1 18.96 3.8 070 31.2
Mean/Total 0 228.6 16.35 124.1 070 32.8
Normal* 137.1§ 193.9 14.05 123.9 080 27.4
StationHong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 996.2 hectopascals at 1500 HKT on 15 October.

The maximum air temperature recorded at the Hong Kong Observatory was 33.5 degrees C at 1308 HKT on 3 October.

The minimum air temperature recorded at the Hong Kong Observatory was 19.0 degrees C at 0647 HKT on 31 October.

The maximum gust peak speed recorded at Waglan Island was 106 kilometres per hour from 050 degrees at 1424 HKT on 15 October.

The maximum 1-minute mean rainfall rate recorded at King's Park was 182 millimetres per hour at 1229 HKT on 4 October.

# Reduced visibility refers to visibility below 8 kilometres when there is no fog, mist or precipitation.

   - The visibility readings at the Hong Kong International Airport are based on hourly observations by professional meteorological observers in 2004 and before, and average readings over the 10-minute period before the clock hour of the visibility meter near the middle of the south runway from 2005 onwards. The change of the data source in 2005 is an improvement of the visibility assessment using instrumented observations following the international trend.

   - Before 10 October 2007, the number of hours of reduced visibility at the Hong Kong International Airport in 2005 and thereafter displayed in this web page was based on hourly visibility observations by professional meteorological observers. Since 10 October 2007, the data have been revised using the average visibility readings over the 10-minute period before the clock hour, as recorded by the visibility meter near the middle of the south runway.

^ In case the data are not available from Waglan Island, observations of Cheung Chau or other nearby weather stations will be incorporated in computing the Prevailing Wind Direction and Mean Wind Speed.

* 1981-2010 Climatlogical Normal, unless otherwise specified

§ 1997-2016 Mean value

Last revision date: <02 Nov 2017>