2013 is the second full year of the 50th Parliament, which first sat on 20 December 2011 and will dissolve on 17 December 2014 if not dissolved prior. The Fifth National Government, first elected in 2008, continues.
20 March – Popular breakfast spread Marmite returns to supermarket shelves, albeit still in limited supply, ending "Marmageddon". The sole production line had stopped in November 2011 due to earthquake damage at the Christchurch factory, which resulted in stocks running out in March 2012.
April
Police celebrate the second-equal lowest Easter road toll on record – three – second only to 2012's zero.[5]
The Akaroa Marine Reserve is approved by the Minister of Conservation Nick Smith, 17 years after it was initially proposed.
28 April – The South Island completes digital television transition when analogue television signals are switched off at 2:00 am.[8]
May
20 May – A morning peak commuter train derails on the approach to Wellington railway station, puncturing a hole in a carriage's floor in the process. Four people are injured and thousands of commuters are stranded as the line into the city is blocked.[9]
June
20–21 June – Wellington is hit by a storm, described to be the worst since the 1968 Wahine storm, with winds reaching 200 km/h. Thousands of homes lose power and part of the Hutt Valley rail line is washed out, causing severe congestion on roads for a week while it is repaired.
22 August – David Shearer announces his resignation as leader of the Labour Party, fearing he no longer had the full confidence of his caucus.[11]
September
15 September – David Cunliffe is elected leader of the Labour Party.
29 September – The Lower North Island and East Cape complete digital television transition when analogue television signals are switched off at 3:00 am.[8]
12 October – Elections held for all local councils, regional councils and district health boards.[13]
14 October – A state of emergency is declared in Manawatu-Wanganui due to flooding.[14]
November
15 November — Over $1.1 billion is allocated to the rebuilding and repairing of 115 severely earthquake damaged schools in greater Christchurch within ten years, which accounts for 80 per cent of classrooms in the region.[15][16]
1 December – The Upper North Island becomes the last region to complete digital television transition bringing to an end 53 years of analogue television broadcasts in New Zealand.[8]
11 December – New Zealand's population reaches 4,500,000, according to Statistics New Zealand estimates.[17]