Another bone-chilling start for the Mackenzie Basin Thursday.
MetService said the temperature at Pukaki fell to -15.7C overnight, after having dropped to -19.8C on Tuesday morning, while the temperature at Mt Cook airfield fell to -12.5C overnight.
Parts of Central Otago were also well below freezing early on Thursday, with Alexandra down to -8C and Queenstown showing -6C.
Christchurch was easily the coldest of the major centres, recording -4C.
A good collection of photos here:
Snow Pic of a Freezing Week.

I found these stats in my travels.
Niwa figures showing the 10 lowest temperatures recorded in New Zealand up to Wednesday:

-25.6 1903 Ranfurly, Central Otago
-21.6 1995 Ophir, Central Otago
-21 2015 Omarama
-19.8 2015 Pukaki Aerodrome
-19.7 1943 Ophir, Central Otago
-18.9 1878 Bealey, Canterbury
-18.6 1939 Manorburn Dam, Central Otago
-18.3 1918 Ranfurly, Central Otago
-17.9 1968 Omarama
-17.5 1930 Manorburn Dam, Central Otago

Cheers
Jenny