I have not read in any reliable source that temoeratures are in any way responsible for the lack of snow. I don't think the suggestion is that the precipittion has been falling as rain becUse it has been too warm rather that weather patterns appear to have changed to those less favourable for snowfall.
In other words there is a lack of precipitation. Whether that is linked to climate change related factors is another issue. I would be surprised that, even allowing for many degrees of warming, it ended up being too mild for snow in midwinter inland in the hills and mountains of Alaska that are described in the Iditarod reports.
It seems that they would rather race on snow than on ice, understandably.