Since the retreat of the glacier, temperatures rose rapidly to about eight thousand years ago, then varied until two thousand years ago, when they declined and then rose to the present temperatures. Until the past few thousand years, seasonal differences have been greater than today. The depth of ponds (and water available to plants and groundwater) has increased progressively, interrupted by notable fluctuations. The past thousand years represents the wettest period since deglaciation. At no point was the climate (combination of temperature and moisture) similar to conditions today or anticipated in the future.