Mayo, Yukon Territory, lies in the widespread discontinuous permafrost zone. Nearby, permafrost thicknesses of up to 40 m have been measured in valleys, and of up to 135 m at higher elevations. Geothermal modeling suggests that if ground temperatures were previously in equilibrium with a near-surface temperature of approximately -3.0°C, then it has taken about 20 years for permafrost to reach present conditions. Observed changes in mean winter temperature and snowfall have probably caused the ground warming. -from Author

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Burn, C. (1992). Recent ground warming inferred from the temperature in permafrost near Mayo, Yukon Territory. Periglacial geomorphology. Proc. 22nd annual symposium in geomorphology, Binghamton, 1991, 327–350.