Napier's lowest temperature reaches 5 degrees in June, where as Alexandra reaches -2 degrees in June and July.
Christchurch had it's warmest month in January with 23 degrees were as in July it was was at it's lowest at 12 degrees
Unless Alexandra reaches over -2 degrees in June and July it will stay the coldest months for a while.
The city's that are higher up in the country are more warmer because it is father way from Antarctica