HKO READINGS & RADIATION LEVEL

YESTERDAY'S WEATHER AND RADIATION LEVEL:
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HONG KONG OBSERVATORY
MAXIMUM AIR TEMPERATURE                       16.0 C
MINIMUM AIR TEMPERATURE                        9.8 C
GRASS MINIMUM TEMPERATURE                      6.9 C
RELATIVE HUMIDITY                          27 - 55 PERCENT
RAINFALL                                         0 MM
TOTAL RAINFALL SINCE 1ST JANUARY              18.2 MM
AGAINST AN AVERAGE OF                         31.9 MM
 
OTHER STATIONS                MIN                  MAX
KING'S PARK                  8.8 C               16.4 C
WONG CHUK HANG               8.3 C               16.0 C
TA KWU LING                  3.4 C               17.9 C
LAU FAU SHAN                 6.8 C               17.3 C
TAI PO                       6.2 C               16.9 C
SHA TIN                      7.0 C               16.6 C
TUEN MUN                     8.4 C               17.4 C
TSEUNG KWAN O                7.1 C               17.5 C
SAI KUNG                     8.6 C               14.8 C
CHEUNG CHAU                  8.0 C               19.3 C
CHEK LAP KOK                 9.6 C               15.7 C
TSING YI                     9.5 C               17.4 C
SHEK KONG                    5.1 C               18.4 C
TSUEN WAN HO KOON            6.6 C               16.9 C
TSUEN WAN SHING MUN VALLEY   6.4 C               18.6 C
HONG KONG PARK               9.3 C               16.9 C
SHAU KEI WAN                 8.7 C               15.5 C
KOWLOON CITY                 8.2 C               19.2 C
HAPPY VALLEY                 9.4 C               17.7 C
WONG TAI SIN                 8.9 C               18.7 C
STANLEY                      9.1 C               16.0 C
KWUN TONG                    8.0 C               17.3 C
SHAM SHUI PO                 8.2 C               18.0 C
KAI TAK RUNWAY PARK          9.4 C               16.8 C
YUEN LONG PARK               6.9 C               17.6 C
TAI MEI TUK                  7.7 C               19.1 C
 
DURATION OF SUNSHINE (KING'S PARK):             10.0 H
 
THE MEAN UV INDEX RECORDED AT KING'S PARK YESTERDAY WAS 3,
THE UV INTENSITY WAS MODERATE.
THE MAXIMUM UV INDEX FOR YESTERDAY WAS 6.
SEA SURFACE TEMPERATURE (WAGLAN ISLAND):     NO DATA
 
YESTERDAY'S (29 JAN 2023) 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                               0.10
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                       0.12
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 00:20 HKT ON 30.01.2023