This page lists any technical changes relating to data in the seven-station temperature series, and provides links for more detail.
In-filling of missing data for ‘Masterton’ in 2016 (implemented June 2016)
Reason:
Missing data at Martinborough in April and May 2016
Effect of change on 100-year warming trend:
Minimal
Effect of change on the year 2016 setting a new record for warmest year:
Small, and not sufficient to deny 2016 as the 7-station annual temperature record
Revised 1945 Hokitika adjustment (implemented February 2016)
Reason:
Further analysis of the Hokitika adjustments suggested that the smaller of the two options in the NIWA 2010 Review was more appropriate.
Effect of change on 100-year warming trend:
The revised 1945 adjustment reduces the warming trend at Hokitika by 0.22°C/century, and therefore the overall 7-station warming trend by about 0.03°C/century.
Correction of value of Waingawa (implemented April 2010)
Reason:
Probable historical data entry error detected
Effect of change on 100-year warming trend:
Minimal
Addition to Climate Database of data for Kelburn December 1927 ( implemented April 2010)
Reason:
Digitisation of one month's paper records
Effect of change on 100-year warming trend:
None
Re-labelling in Climate Database of Hokitika temperature data 1867-1964 (implemented April 2010)
Reason:
Two climate stations operated and have now been assigned separate station agent numbers
Effect of change on 100-year warming trend:
None
Addition in Climate Database of data for Nile St Vicarage in Nelson 1907-1920 (implemented April 2010)
Reason:
Early paper records of Nelson climate measurements made at the vicarage have been recovered from storage and digitised.
Effect of change on 100-year warming trend:
None