A number of data sets are now available in csv format for you to use with your class when investigating time series data at NZ Curriculum Level 8 (or AS 3.8).
Data sets include: NZ Alcohol consumption, Births, Rainfall, Travel and Tourism, Accomodation, Air Passengers and temperatures around the world.
Click here to go to the resource: Time series data sets 2013, Time series data sets 2012, and iNZight instructions for time series.