A surge of cold polar air dropped temperatures over Saturday night and Sunday morning well below freezing.
“Had enough of the cold?” MetService asked on Twitter. “Last night Twizel got to -5.7C (21.7F), Timaru -3.7C (25.3F) and Queenstown -2.4C (27.7F).”
The cold snap was caused by the winds which wrought destruction across New Zealand earlier this week dying down and being replaced by high pressure from the polar region.
Thanks to Argiris Diamantis for this link