天文台的酷熱天氣警告, 是根據甚麼來定, 那時候發出的?
By Ling Cheung (pupil) on 2013-05-31 Answers 1 Views 89
By BetsyKam (middle-school student) on 2013-06-04
當香港廣泛地區的最高氣溫預料高達攝氏33度或以上便會發出酷熱天氣警告.