Technical notes on seven-station temperature series data

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

Full details

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.

Full details

Correction of value of Waingawa (implemented April 2010)

Reason:

Probable historical data entry error detected 

Effect of change on 100-year warming trend:

Minimal

Full details

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

Full details 

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

Full details 

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

Full details