New Zealand’s win­ters get­ting shorter

The Guardian Weekly - - World roundup -

14 New Zealand’s win­ter has short­ened by a month over the last 100 years, with the sea­son of very low tem­per­a­tures, frosts and snow start­ing sig­nif­i­cantly later in the year and end­ing ear­lier.

Brett Mul­lan, from the Na­tional In­sti­tute of Wa­ter and At­mo­spheric Re­search, com­pared records from two 30-year pe­ri­ods over the last cen­tury to see if New Zealand was ex­pe­ri­enc­ing the same con­trac­tion of win­ter weather noted in other parts of the world.

Mul­lan de­fined a win­ter’s day as one in which the daily av­er­age tem­per­a­ture was be­low 9C. He ex­am­ined tem­per­a­tures be­tween 1909 and 1938, and 1987 to 2016, from seven rep­re­sen­ta­tive re­gions. He found there was an av­er­age of 100 days per year be­tween 1909 and 1938 when the tem­per­a­ture was be­low 9C, com­pared with only 70 days per year be­tween 1987 and 2016.

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