Climate mapping

NIWA can map any aspect of climate.

For example:

  • Where can I grow grapes?
  • Where could we best locate a wind farm?
  • Do I need to upgrade my flood protection scheme?

All our maps have been updated to the latest 30-year climate normal period, 1981-2010. We can map from the national, through to the regional, to the local.

More information on national and regional climate maps

The data behind our maps

We build our maps using data from NIWA’s extensive national climate database, satellite data, and output from global-scale and local-scale climate models. Our maps are created using a Geographic Information System (GIS). As a result, we can make attractive images and provide valuable climate information as digital layers to be incorporated into your specific project.

An analysis of the mapping error

We have performed a detailed analysis of the spatial interpolation model prediction error for a number of climate variables.  The analysis can be downloaded below.

Model prediction error analysis (PDF 3.1 MB)

Many uses for NIWA mapping services

Flood estimation

The map (to the right) of the 100-year return period 24-hour rainfall total for the lower North Island is based on a High Intensity Rainfall Design System (HIRDS). It can be used for the estimation of design rainfalls (e.g., for river flood estimation), and to assess the rarity of observed storm events.

More information about HIRDS

Wind power generation

Potential sites for wind power generation are shown in red. The sites have been identified as having a mean annual wind speed of more than 8 m/s (28.8 km/h) - see the map to the right for an example.

Crop suitability

Combining maps of climate parameters with soil maps and specific crop requirement information enables us to produce crop suitability maps like this one showing the potential growing areas for fig. The map to the right was created for the Kaipara and Far North District Councils.

Types of climate maps available

You can get maps of the following climate parameters:

  • rainfall total
  • number of days of rain
  • rainfall intensity
  • air temperature
  • soil temperature
  • sunshine hours
  • solar radiation
  • potential evapotranspiration
  • evaporation
  • growing degree days
  • cooling degree days
  • winter chilling
  • number of days of snow, hail, etc.
  • wind speed
  • frost incidence

All maps are available as GIS layers.

Variability

Often, understanding the variability is just as important as knowing the mean conditions. We can show the variability of the data by mapping the standard deviation, or the range, or the one-year-in-ten high and low values, or the number of days in excess of a specified threshold.

Also, we can produce special combination maps, such as the mean annual number of days with rainfall greater than 1mm and maximum temperature less than 5°C, for example.

Whatever you want, we can map it for you.

Rainfall and temperature patterns for New Zealand are extremely diverse, due to our geographic location and complex terrain. These two posters (sold as a set) show how the mean annual rainfall and temperature vary throughout the country.

The posters are approximately 60 cm x 85 cm.

NIWA Poster Nos. 4 & 5, 2004.

$28 (plus $5 for overseas orders)

Order posters

Other climate data products from NIWA

Contact

For further information regarding purchasing climate maps, GIS layers, or other climate data products please contact:

Dr Andrew Tait
National Climate Centre
NIWA
Private Bag 14901
Wellington

Email: andrew.tait@niwa.co.nz
Phone: +64 4 386 0300
Fax: +64 7 856 0151

Acknowledgements

mike_roan_2.jpg

Meridian Wholesale Markets Manager Mike Roan: “We have to look out over longer horizons". Credit: Dave Hansford

NIWA_mapping_national_regional_local.png

Left: National mapping - NZ mean annual rainfall. Top right: Regional mapping - El Nino temperature anomaly (Otago). Bottom right: Local mapping - frost-free period (Renwick). [NIWA]

Modelling future heavy rainfall events

Map of the 100-year ARI rainfall for the lower North Island.

wind-energy_large.jpg

Potential sites for wind power generation. [NIWA]

potential_growing_areas_for_fig.jpg

Potential growing areas for fig. Created for the Kaipara and Far North District Councils. [NIWA]

NZ_annual_rainfall_and_temp_posters.png

Mean annual rainfall and temperature for New Zealand - poster set of two. [NIWA]