Leslie Holdridge

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Leslie Holdridge
Born Leslie Rensselaer Holdridge
September 29, 1907
Ledyard, Connecticut
Died June 19, 1999(1999-06-19) (aged 91)
Easton, Maryland
Nationality USA
Citizenship USA
Alma mater H. B.S. in Forestry, University of Maine, 1931, postgrad., 1931-32
M.S. in Ecology, University of Michigan, 1946, Ph.D., 1947.
Scientific career
Institutions Instituto Tecnologico de Costa Rica

Leslie Ransselaer Holdridge (September 29, 1907 – June 19, 1999) was an American botanist and climatologist. He was the son of Samuel Eneas Holdridge and Phebe J. Holmes. He was the father of composer Lee Holdridge.


Diagram of life zone classifications.

In his famous 1947 paper, he defined "life zones" using three indicators:

  1. Mean annual biotemperature (average temperature, after data values below 0 °C or above 30 °C have been eliminated)
  2. Total annual precipitation
  3. The ratio of mean annual potential evapotranspiration to mean total annual precipitation.

See also[edit]