Canada's Plant Hardiness Site

ANUCLIM - Technical Details

ANUCLIM is an early-generation climate envelope approach that works by summarizing the climate at known occurrence locations for a species. The climate envelopes presented here are based on six climate variables:

  1. annual mean temperature,
  2. minimum temperature of the coldest month,
  3. maximum temperature of the warmest month,
  4. annual precipitation,
  5. precipitation of the warmest quarter, and
  6. precipitation of the coldest quarter

For each climate variable, ANUCLIM identifies the following statistical attributes based on climate values at the known occurrence locations: minimum, maximum, mean, as well as the 2.5, 5, 10, 25, 50, 75, 90, 95, and 97.5 percentiles. Our climate envelope maps show both a full climatic range (defined by the grid cells with climate values that fall between the minimum and maximum values defined by the distribution data) and a core climatic range (defined by grid cells with climate values that fall between the 5th and 95th percentiles).

For more information on ANUCLIM see:

Xu, T., & Hutchinson, M. F. (2013). New developments and applications in the ANUCLIM spatial climatic and bioclimatic modelling package. Environmental Modelling & Software, 40, 267-279.

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