Temperature/wind -chill index
Temperature/windchill index: nomogram used by US Air Force at Goose Bay Air Base, Labrador.

Read the temperature horizontally and the wind velocity vertically. The point of intersection is the wind-chill factor. For example, if the wind were 30 km/h and the temperature -25°C, the wind-chill index would be V.

  1. Comfortable with normal precaution.
  2. Work and travel become more uncomfortable unless properly clothed.
  3. Work and travel become more hazardous unless properly clothed. Heavy outer clothing necessary.
  4. Unprotected skin will freeze with direct exposure over prolonged period. Heavy outer clothing becomes mandatory.
  5. Unprotected skin can freeze in one minute with direct exposure. Multiple layers of clothing mandatory. Adequate face protection becomes important. Work and travel alone not advisable.
  6. Adequate face protection becomes mandatory. Work and travel alone prohibited. Supervisors must control exposure times by careful work scheduling.
  7. Personnel become easily fatigued. Buddy system and observation mandatory.

NOTE: Proper clothing simply means protecting all skin areas from direct wind with sufficient thickness to prevent undue coldness.

Adapted by Duleepa Wijayawardhana, 1998. Courtesy of McGill-Queen's University Press, Montreal, Quebec. From Hugh M. French and Olav Slamaker, eds., Canada's Cold Environments (Montreal: McGill-Queen's University Press, ©1993) 9.
Natural Environment - Table of Contents Site Map Search Heritage Web Site Home