Too Warm for Winter Jam, says NYC Parks.  Hang up those snowshoes. The NYC Parks Department has officially canceled this year’s Winter Jam, an annual event that invites New Yorkers to come try out an array of snow sports in Brooklyn’s Prospect Park. What gives? Not only is there no snow in the forecast for the planned February 4 date, but average temperatures are too high for the city to even fake it. “It is simply too warm to make snow, and the long-range weather forecasts and current ground temperatures make it extremely unlikely that snow could be made,” said Parks Commissioner Adrian Benepe.