The meteorological winter in the northern hemisphere and summer in the southern hemisphere finished officially at the end of February. The UN weather agency, World Meteorological Organisation (WMO), says February saw more extreme heat and unusually high temperatures in both hemispheres.Summarising the state of the climate, it said the month ended with extreme heat in the southern hemisphere where it is summer, while high temperatures atypical of the northern hemisphere winter prevailed. Parts of North and South America, northwest and southeast Africa, southeast and far eastern Asia, western Au…