HKO READINGS & RADIATION LEVEL

YESTERDAY'S WEATHER AND RADIATION LEVEL:
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HONG KONG OBSERVATORY
MAXIMUM AIR TEMPERATURE                       28.8 C
MINIMUM AIR TEMPERATURE                       24.9 C
GRASS MINIMUM TEMPERATURE                     24.9 C
RELATIVE HUMIDITY                          82 - 96 PERCENT
RAINFALL                                      42.4 MM
TOTAL RAINFALL SINCE 1ST JANUARY             869.2 MM
AGAINST AN AVERAGE OF                       1302.2 MM
 
OTHER STATIONS                MIN                  MAX
KING'S PARK                  24.2 C               29.0 C
WONG CHUK HANG               24.7 C               28.3 C
TA KWU LING                  25.5 C               32.9 C
LAU FAU SHAN                 25.0 C               31.6 C
TAI PO                       24.3 C               29.4 C
SHA TIN                      24.5 C               30.5 C
TUEN MUN                     25.9 C               29.8 C
TSEUNG KWAN O                23.9 C               27.5 C
SAI KUNG                     24.2 C               29.3 C
CHEUNG CHAU                  23.9 C               26.7 C
CHEK LAP KOK                 26.1 C               31.4 C
TSING YI                     24.8 C               30.6 C
SHEK KONG                    25.2 C               30.9 C
TSUEN WAN HO KOON            24.2 C               28.7 C
TSUEN WAN SHING MUN VALLEY   24.4 C               29.8 C
HONG KONG PARK               24.3 C               27.6 C
SHAU KEI WAN                 23.7 C               27.7 C
KOWLOON CITY                 24.0 C               29.3 C
HAPPY VALLEY                 25.1 C               29.0 C
WONG TAI SIN                 24.4 C               29.5 C
STANLEY                      24.4 C               27.9 C
KWUN TONG                    23.8 C               28.0 C
SHAM SHUI PO                 24.7 C               30.5 C
KAI TAK RUNWAY PARK          24.7 C               28.7 C
YUEN LONG PARK               25.6 C               33.3 C
TAI MEI TUK                  25.2 C               32.5 C
 
DURATION OF SUNSHINE (KING'S PARK):              0.4 H
 
THE MEAN UV INDEX RECORDED AT KING'S PARK YESTERDAY WAS 2,
THE UV INTENSITY WAS LOW.
THE MAXIMUM UV INDEX FOR YESTERDAY WAS 8.
SEA SURFACE TEMPERATURE (WAGLAN ISLAND):     NO DATA
 
YESTERDAY'S (18 JUL 2021) AVERAGE AMBIENT GAMMA RADIATION
DOSE RATE TAKEN OUTDOORS IN HONG KONG RANGED FROM 0.08 TO
0.14 MICROSIEVERT PER HOUR.  THESE ARE WITHIN THE NORMAL
RANGE OF FLUCTUATION OF THE BACKGROUND RADIATION LEVEL IN
HONG KONG (SEE NOTE). THE AVERAGE DOSE RATES MEASURED AT
THE RADIATION MONITORING STATIONS OVER VARIOUS PARTS OF THE
TERRITORY WERE AS FOLLOWS :
 
STATION                     YESTERDAY'S AVERAGE
                            (MICROSIEVERT/HOUR)
PING CHAU                           0.09
TAP MUN                             0.08
KAT O                               0.10
YUEN NG FAN                         0.12
TAI MEI TUK                         0.11
SHA TAU KOK                         0.10
KWUN TONG                           0.12
SAI WAN HO                          0.09
KING'S PARK                         0.13
TSIM BEI TSUI                       0.12
CAPE D'AGUILAR                      0.13
CHEK LAP KOK                        0.14

 
NOTE
1.     FROM READINGS TAKEN AT VARIOUS LOCATIONS IN HONG KONG IN THE
       PAST, THE HOURLY MEAN AMBIENT GAMMA RADIATION DOSE RATE MAY 
       VARY BETWEEN 0.06 AND 0.3 MICROSIEVERT PER HOUR. 
       (1 MICROSIEVERT = 0.000001 SIEVERT = 0.001 MILLISIEVERT)
 
2.     TEMPORAL VARIATIONS ARE GENERALLY CAUSED BY CHANGES IN
       METEOROLOGICAL CONDITIONS SUCH AS RAINFALL, WIND AND 
       BAROMETRIC PRESSURE.
 
3.     SPATIAL VARIATIONS ARE GENERALLY CAUSED BY DIFFERENCES IN 
       THE RADIOACTIVE CONTENT OF LOCAL ROCK AND SOIL.
 
4.     THE DATA DISPLAYED IS PROVISIONAL. ONLY LIMITED DATA 
       VALIDATION HAS BEEN CARRIED OUT.
 
5.     THE RANGE OF RELATIVE HUMIDITY IN THE DAILY WEATHER SUMMARY 
       ORIGINATES FROM THE OBSERVER'S REPORTS OF HOURLY READINGS 
       OF THE DAY. THIS FOLLOWS THE LONG-TERM PRACTICE OF COLLECTING
       CLIMATOLOGICAL DATA OF THE HONG KONG OBSERVATORY FOR OVER A 
       CENTURY. IT MAY DIFFER FROM THE RELATIVE HUMIDITY RANGE 
       DERIVED FROM THE 1-MINUTE REPORTS OF THE AUTOMATIC WEATHER 
       STATION.

DISPATCHED BY HONG KONG OBSERVATORY AT 00:34 HKT ON 19.07.2021