The Weather of February 2009
February 2009 was the warmest February since records began in 1884. The monthly mean temperature of 20.5 degrees was 4.2 degrees higher than normal. The temperature of 28.3 degrees recorded on February 25 was the highest temperature for February. The month was also sunnier than normal. The total bright sunshine duration for the month was 140.7 hours, about 50 percent above normal. Only 1.1 millimetres of rainfall was recorded in February 2009, much below the normal figure of 52.3 millimetres.
The weather in Hong Kong was generally cloudy on the first day of the month. Under the influence of a ridge of high pressure over southeastern China, the local weather became fine on 2 February. It remained generally fine for the ensuing 9 days.
A humid maritime airstream dominated over the south China coastal areas and brought cloudy and humid weather to the territory from 12 to 15 February. It was also foggy on 15 February. The visibility dropped below 400 meters in the harbour on that day.
Under the influence of an easterly airstream, the weather in Hong Kong was windy, rainy and slightly cooler from 16 to 18 February. It remained cloudy with light rain patches on 19 February.
A dry northerly airstream reached the south China coastal areas on the morning of 20 February. Locally, weather became fine later that day. With the winds turning to easterly, it was windy and cloudy on 21 February. Local winds subsided gradually the next day.
It was humid with fog from 23 to 25 February when Hong Kong was affected by a warm and humid maritime airstream. The temperature at the Hong Kong Observatory rose to a maximum of 28.3 degrees on 25 February, the highest of the month. A weak replenishment of the northeast monsoon reached the coastal areas of Guangdong on the morning of 26 February and brought cloudy and cooler weather to Hong Kong for the last three days of the month.
There was no tropical cyclone over the South China Sea and the western North Pacific in the month.