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Fig. 1. Weekly mean temperatures from September to May 1999-2000 (A) and daily minimum temperatures from 30 December to 26 February 1999-2000 (B) near Sudbury, Ontario, Canada. Snow cover indicates continuous days of at least 10 cm of snowpack, the period represented in B. Subnivean temperatures were recorded at the ground surface while supranivean temperatures were recorded 25 cm above the ground.