It's certainly a colder morning across New Zealand this morning with frosty areas, mostly in the south, and temperatures as low as four degrees around Waikato.

The problem with overnight lows in New Zealand (and our daytime highs sometimes) is that others use one temperature to measure a region - usually taken at an airport, says WeatherWatch.co.nz

'However, most of the main centres have a big range of 8.30am temperatures with a several degree spread depending on if you're coastal, inland, in a valley, on a hill, have sunshine on your property already etc.

'So a cold to cold-ish start to the day - things warm up a bit for most this afternoon but tonight may be cold for many still too,” says the weather organisation.

Wednesday looks warmer - the next cold change arrives nationwide over Thursday and Friday.

Temps from the live Wunderground community network. These images show the temperatures around the country at 8.30am.