June 2022 was characterized by cloudy and showery weather during the first three weeks and most of the time sunny and very hot weather for the rest of the month. Overall, the month was cloudier than usual. The mean amount of cloud in the month was 83 percent, about 6 percent above the normal of 77 percent for June. The duration of bright sunshine in the month was 116.1 hours, about 20 percent below the normal figure of 144.3 hours. The monthly mean temperature was 28.6 degrees, 0.3 degree above the normal figure of 28.3 degrees. As for monthly rainfall, while more than 450 millimetres of rainfall were recorded over Tsuen Wan, Tai Po and Sai Kung Districts, the monthly rainfall recorded at the Observatory was only 349.2 millimetres, about 29 percent below the normal of 491.5 millimetres. The accumulated rainfall recorded in the first half of the year was 1054.5 millimetres, a deficit of about 3 percent compared to the normal of 1082.5 millimetres for the same period. 

Under the influence of the southwest monsoon, the weather of Hong Kong was hot with a mixture of sunshine, showers and thunderstorms on the first six days of the month. Showers were heavier over parts of the New Territories on 3 June with more than 50 millimetres of rainfall recorded over Tsuen Wan and Tai Po. Affected by an active trough of low pressure lingering over the coast of Guangdong, local weather turned unsettled with occasional heavy showers and squally thunderstorms on 7 – 11 June. More than 200 millimetres of rainfall were generally recorded over the territory and rainfall even exceeded 300 millimetres over the eastern part of Hong Kong on these five days. The heavy rain on the morning of 8 June necessitated the issuance of the second Red Rainstorm Warning Signal in the year. There were serious flooding over some places in the New Territories and landslides were reported in Sai Kung on that day. A woman died after being washed away by flash floods in Wang Chung Stream, Tai Po on the same day. Waterspout was also spotted near Cheung Chau on the morning of 8 June.

The trough of low pressure moved northwards gradually towards inland areas on 12 June. Under the influence of an active southwesterly airstream, the weather was mainly cloudy with showers and a few squally thunderstorms at first on 12 June. The showers were heavier over Chek Lap Kok and Tsuen Wan where more than 50 millimetres of rainfall were recorded in that morning. With the showers easing off on the afternoon of 12 June, the weather became hot with sunny periods on 13 June.

With the return of the trough of the low pressure, showery weather with squally thunderstorms affected Hong Kong again on 14 – 16 June. More than 40 millimetres of rainfall were recorded over most parts of territory and rainfall even exceeded 70 millimetres over Sai Kung and parts of Kowloon in these three days. Under the rain, the temperature at the Observatory dropped to a minimum of 24.0 degrees on 15 June, the lowest of the month. Affected by a southerly airstream, there were sunny intervals and some showers in Hong Kong on 17 – 21 June.

Dominated by an anticyclone aloft, apart from a few showers, mainly fine and very hot weather prevailed in Hong Kong during 22 – 29 June. With plenty of sunshine, the maximum temperature at the Observatory soared to 34.4 degrees on 28 June, the highest of the month. Besides, an area of low pressure over the central part of the South China Sea developed into a tropical depression on 29 June. It was named Chaba and intensified into a tropical storm the next morning. With Chaba moving towards the coast of western Guangdong, there were squally showers and thunderstorms in Hong Kong on the last day of the month and winds strengthened gradually at night. More than 20 millimetres of rainfall were recorded over most parts of territory, and rainfall even exceeded 50 millimetres over Hong Kong Island, Kowloon and the eastern part of the New Territories that day.

Two tropical cyclones occurred over the South China Sea and the western North Pacific in June 2022.

Waterspout near Cheung Chau on 8 June 2022



Landslides were reported at Pak Tam Road, Sai Kung on 8 June 2022 (Courtesy of Commercial Radio Hong Kong)



Preliminary rainfall distribution in Hong Kong in June 2022 (based on rain gauges and radar data)

Warnings and Signals issued in June 2022

Table 1.1   Tropical Cyclone Warning Signals

Name of Tropical Cyclone	Signal Number	Beginning Time		Ending Time
		Day/Month	HKT	Day/Month	HKT
CHABA	1	29 / 6	2110	30 / 6	2240
	3	30 / 6	2240	1 / 7	1910

Table 1.2   Rainstorm Warning Signals

Colour	Beginning Time		Ending Time
	Day/Month	HKT	Day/Month	HKT
Amber	7 / 6	0345	7 / 6	0640
Amber	7 / 6	1935	7 / 6	2045
Amber	8 / 6	0945	8 / 6	1045
Red	8 / 6	1045	8 / 6	1615
Amber	8 / 6	1615	8 / 6	1715
Amber	11 / 6	1315	11 / 6	1530
Amber	14 / 6	1930	14 / 6	2045
Amber	15 / 6	1930	15 / 6	2140

Table 1.3   Thunderstorm Warning

Beginning Time		Ending Time
Day/Month	HKT	Day/Month	HKT
1 / 6	0458	1 / 6	0630
1 / 6	1200	1 / 6	1500
2 / 6	0145	2 / 6	0530
2 / 6	1540	2 / 6	1700
3 / 6	0203	3 / 6	1730
6 / 6	0837	6 / 6	1555
6 / 6	1750	6 / 6	2000
6 / 6	2217	7 / 6	0850
7 / 6	0945	7 / 6	1600
7 / 6	1755	7 / 6	2200
8 / 6	0820	8 / 6	2100
9 / 6	0905	9 / 6	1745
9 / 6	1905	9 / 6	2030
9 / 6	2220	10 / 6	0030
10 / 6	0745	10 / 6	1225
11 / 6	0050	11 / 6	0230
11 / 6	0410	11 / 6	0830
11 / 6	1140	11 / 6	1600
12 / 6	0320	12 / 6	0650
14 / 6	0920	14 / 6	2200
15 / 6	0345	15 / 6	0600
15 / 6	1025	15 / 6	2400
16 / 6	0130	16 / 6	0400
16 / 6	0935	16 / 6	1225
16 / 6	1305	16 / 6	1345
17 / 6	0315	17 / 6	0415
17 / 6	1010	17 / 6	1115
18 / 6	0905	18 / 6	1000
20 / 6	0245	20 / 6	0500
25 / 6	1242	25 / 6	1500
29 / 6	1225	29 / 6	1600
30 / 6	0235	30 / 6	0630
30 / 6	0710	30 / 6	2000

Table 1.4   Very Hot Weather Warning

Beginning Time		Ending Time
Day/Month	HKT	Day/Month	HKT
22 / 6	0645	29 / 6	1620

Table 2   Figures and Departures from Normal - June 2022

Meteorological Element	Figure of the Month	Departure from Normal*
Mean Daily Maximum Air Temperature	31.0 degrees C	0.3 degree above normal
Mean Air Temperature	28.6 degrees C	0.3 degree above normal
Mean Daily Minimum Air Temperature	26.8 degrees C	0.3 degree above normal
Mean Dew Point Temperature	25.0 degrees C	0.1 degree above normal
Mean Relative Humidity	81 %	1 % below normal
Mean Cloud Amount	83 %	6 % above normal
Total Rainfall	349.2 mm	142.3 mm below normal
Number of hours of Reduced VisibilityΔ	0 hour	14.2 hours below normal§
Total Bright Sunshine Duration	116.1 hours	28.2 hours below normal
Mean Daily Global Solar Radiation	14.33 Megajoule / square metre	0.28 Megajoule below normal
Total Evaporation	86.7 mm	27.1 mm below normal

Remarks :	All measurements were made at the Hong Kong Observatory except sunshine, solar radiation and evaporation which were recorded at King's Park Meteorological Station and visibility which was observed at the Hong Kong International Airport.
Δ	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.
*	Departure from 1991 - 2020 climatological normal, except for number of hours of reduced visibility
§	Departure from mean value between 1997 and 2021

Remarks :

Extremely high: above 95th percentile Above normal: between 75th and 95th percentile Normal: between 25th and 75th percentile Below normal: between 5th and 25th percentile Extremely low: below 5th percentile Percentile and 5-day running average values are computed based on the data from 1991 to 2020