19 dec/16
25 degree change in temp from a day ago. It has gone from -30 to -4 C. It's not really that uncommon - a change of that magnitude tends to happen at least once a winter, and it can either go up or drop down. A large downward drop can cause animals some problems, especially if the temp. was above 0C. Snow can form a pretty thick, icy crust, making it hard for wildlife to get to grass, etc. Birds tend to have it better than mammals, but even then trees can get wet from melting snow and then it can freeze. Lot's more things out and about this morning.
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