HKO READINGS & RADIATION LEVEL

YESTERDAY'S WEATHER AND RADIATION LEVEL:
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HONG KONG OBSERVATORY
MAXIMUM AIR TEMPERATURE                       19.3 C
MINIMUM AIR TEMPERATURE                       15.7 C
GRASS MINIMUM TEMPERATURE                     15.0 C
RELATIVE HUMIDITY                          48 - 93 PERCENT
RAINFALL                                       9.4 MM
TOTAL RAINFALL SINCE 1ST JANUARY            2297.2 MM
AGAINST AN AVERAGE OF                       2422.4 MM
 
OTHER STATIONS                MIN                  MAX
KING'S PARK                  14.5 C               18.6 C
WONG CHUK HANG               15.5 C               19.5 C
TA KWU LING                  12.9 C               18.1 C
LAU FAU SHAN                 13.4 C               17.2 C
TAI PO                       13.7 C               18.7 C
SHA TIN                      14.5 C               18.9 C
TUEN MUN                     13.8 C               18.1 C
TSEUNG KWAN O                14.7 C               19.6 C
SAI KUNG                     14.2 C               19.4 C
CHEUNG CHAU                  15.0 C               18.5 C
CHEK LAP KOK                 14.3 C               20.4 C
TSING YI                     15.6 C               19.3 C
SHEK KONG                    13.4 C               18.7 C
TSUEN WAN HO KOON            14.5 C               17.4 C
TSUEN WAN SHING MUN VALLEY   15.3 C               18.3 C
HONG KONG PARK               15.0 C               19.1 C
SHAU KEI WAN                 14.1 C               18.9 C
KOWLOON CITY                 14.5 C               18.5 C
HAPPY VALLEY                 15.2 C               19.7 C
WONG TAI SIN                 14.8 C               19.0 C
STANLEY                      14.8 C               19.3 C
KWUN TONG                    13.6 C               18.5 C
SHAM SHUI PO                 14.8 C               19.3 C
KAI TAK RUNWAY PARK          14.8 C               19.6 C
YUEN LONG PARK               13.3 C               17.9 C
TAI MEI TUK                  14.0 C               18.2 C
 
DURATION OF SUNSHINE (KING'S PARK):              0.0 H
 
THE MEAN UV INDEX RECORDED AT KING'S PARK YESTERDAY WAS
0.5, THE UV INTENSITY WAS LOW.
THE MAXIMUM UV INDEX FOR YESTERDAY WAS 2.
SEA SURFACE TEMPERATURE (WAGLAN ISLAND):     NO DATA
 
YESTERDAY'S (20 DEC 2021) AVERAGE AMBIENT GAMMA RADIATION
DOSE RATE TAKEN OUTDOORS IN HONG KONG RANGED FROM 0.09 TO
0.15 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                           0.10
TAP MUN                             0.09
KAT O                               0.11
YUEN NG FAN                         0.12
TAI MEI TUK                         0.12
SHA TAU KOK                         0.10
KWUN TONG                           0.12
SAI WAN HO                          0.09
KING'S PARK                         0.14
TSIM BEI TSUI                       0.13
CAPE D'AGUILAR                      0.13
CHEK LAP KOK                        0.15

 
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 00:26 HKT ON 21.12.2021