But more proof needed to link it to global warming Hong Kong has experienced the warmest February on record, with a monthly mean temperature of 19.5 degrees Celsius, but there is no evidence it is a result of global warming, according to the Observatory. The previous warmest February was 34 years ago, in 1973, when the mean temperature was 19.2 degrees. Observatory scientific officer Lee Tsz-cheung said there were four reasons for the warm February this year, which brought sultry 25 degrees-plus temperatures to the traditionally chilly Lunar New Year. First, the pool of cold air over northern China to southern Siberia, the origin of monsoon surges, was warmer than normal. Second, there were fewer colder northerly and northeasterly winds and more mild easterly winds. Third, the weather was sunnier than usual, with total bright sunshine of 129.6 hours, about 33 per cent above the normal 97.7 hours. Also contributing to above-normal winter temperatures was an El Nino weather pattern that started to develop in the latter part of last year. The mean minimum temperature for February was also a record high, at 17.8 degrees. Under the influence of a maritime airstream, it was warm with fog patches in the lead-up to Lunar New Year on February 17 and 18. The maximum temperature on February 18 reached 25.3 degrees, making it the warmest Lunar New Year's Day on record. The month was also drier than usual. Only 6.9mm of rainfall was recorded, about one-seventh of the normal figure of 48mm, the average amount over the past 40 years. The accumulated rainfall in the first two months of this year was 36.5mm, about half the normal figure of 71.4mm for the same period. Asked whether last month's weather was an indicator of global warming, the Observatory said more evidence would be needed to establish that.