HKO READINGS & RADIATION LEVEL

YESTERDAY'S WEATHER AND RADIATION LEVEL:
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HONG KONG OBSERVATORY
MAXIMUM AIR TEMPERATURE                       27.5 C
MINIMUM AIR TEMPERATURE                       21.9 C
GRASS MINIMUM TEMPERATURE                     18.7 C
RELATIVE HUMIDITY                          62 - 84 PERCENT
RAINFALL                                         0 MM
TOTAL RAINFALL SINCE 1ST JANUARY              82.6 MM
AGAINST AN AVERAGE OF                        221.6 MM
 
OTHER STATIONS                MIN                  MAX
KING'S PARK                  20.9 C               27.0 C
WONG CHUK HANG               NO DATA             NO DATA
TA KWU LING                  19.7 C               29.5 C
LAU FAU SHAN                 18.8 C               32.1 C
TAI PO                       19.1 C               27.8 C
SHA TIN                      18.0 C               28.0 C
TUEN MUN                     20.2 C               26.5 C
TSEUNG KWAN O                17.9 C               26.4 C
SAI KUNG                     18.6 C               27.0 C
CHEUNG CHAU                  19.9 C               27.3 C
CHEK LAP KOK                 22.0 C               28.9 C
TSING YI                     19.6 C               28.4 C
SHEK KONG                    17.0 C               30.1 C
TSUEN WAN HO KOON            18.0 C               28.0 C
TSUEN WAN SHING MUN VALLEY   17.8 C               28.9 C
HONG KONG PARK               20.2 C               26.6 C
SHAU KEI WAN                 20.4 C               25.8 C
KOWLOON CITY                 20.4 C               27.8 C
HAPPY VALLEY                 19.4 C               27.4 C
WONG TAI SIN                 19.5 C               27.6 C
STANLEY                      20.6 C               26.5 C
KWUN TONG                    20.4 C               28.0 C
SHAM SHUI PO                 20.4 C               28.8 C
KAI TAK RUNWAY PARK          21.6 C               25.1 C
YUEN LONG PARK               18.0 C               30.4 C
TAI MEI TUK                  19.5 C               28.0 C
 
DURATION OF SUNSHINE (KING'S PARK):             11.3 H
 
THE MEAN UV INDEX RECORDED AT KING'S PARK YESTERDAY WAS 5,
THE UV INTENSITY WAS MODERATE.
THE MAXIMUM UV INDEX FOR YESTERDAY WAS 9.
SEA SURFACE TEMPERATURE (WAGLAN ISLAND):        21.6 C
 
YESTERDAY'S (16 APR 2025) AVERAGE AMBIENT GAMMA RADIATION
DOSE RATE TAKEN OUTDOORS IN HONG KONG RANGED FROM 0.08 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                           0.09
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                           0.13
SAI WAN HO                          0.08
KING'S PARK                         0.15
TSIM BEI TSUI                       0.13
CAPE D'AGUILAR                      0.12
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 00:15 HKT ON 17.04.2025