A number of factors can make it hard to tell what the weather will be like ahead of time. There are mountains of data that must be processed, and choosing the right model can be tricky. "Some models seem to do a better job forecasting certain things out two, three, four days, but when you get closer to the actual event, another model might do a better job of something like snowfall amounts," said Mary Stampone, an assistant professor of geography at the University of New Hampshire and the official state climatologist.

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