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There is really no universal definition of the time span at which "weather" becomes "climate. " Around the one-month mark, though, the definition of of a phenomenon as "weather" begins to fray a little. We all have an intuitive sense of what's "normal" temperature for the place we live in a given month, but not a given day of a month.  In the case of the billion-dollar disaster analysis, there are some categories that are unequivocally weather (individual hurricanes, for example) and others that would stretch the definition of "weather" a little too far, such as droughts that can last for months or several seasons. In addition, the way the report has chosen to handle fires--as a seasonal and regional aggregate--is a little closer to the "climate" end of the continuum than the "weather" end.