The temperature often varied more than 20 degrees during a few hundred years or perhaps less.The Holocene cold and warm periods, however, represent only small temperature changes compared to both the glaciation periods and the other interglacial periods.The vertical scale on the left shows the temperature on the surface of the ice, and the horizontal scale is years before present. It appears that the climate of the Holocene really has been very stable and the temperature has only varied a few degrees - The most dramatic event so far has been the 8,200 cold period and the ensuing Holocene maximum in the Stone Age.
About 8,000 years before present, in Hunter Stone Age, occurred the hottest period throughout the Holocene.
This initiated the warm period called the Holocene Optimum, which lasted almost until about 4,500 years before present, whereafter the temperature continued to drop through bronze age, iron age and historical time until it reached a low point in "The Little Ice Age" in the years 1600- 1700. On this graph the Stone Age is shown only about one degree warmer than present day, but most sources mention that Scandinavian Stone Age was about 2-3 degrees warmer than the present; this need not to be mutually excluding statements, because the curve reconstructs the entire Earth's temperature, and on higher latitudes the temperature variations were greater than about equator.
However, generally speaking the Holocene represents an amazing stable climate, where the the cooling through the period has been limited to a few degrees.
The general decline in temperatures since 8000 years before present was overlaid by several cold and warm periods.
Note moreover almost all heating periods characteristic shape.
The heat comes suddenly, perhaps in a few decades and then decreases slowly.Within the last few hundred years the temperature has again increased, but not to such heights as in Hunter Stone Age. It shows eight different reconstructions of Holocene temperature. Some reconstructions show a vertical dramatic increase in temperature around the year 2000, but it seems not reasonable to the author, since that kind of graphs can not possibly show temperature in specific years, it must necessarily be smoothed by a kind of mathematical rolling average, perhaps with periods of hundred years, and then a high temperature in a single year, for example 2004 will be much less visible.The trend seems to be that Holocene's highest temperature was reached in the Hunter Stone Age about 8,000 years before present, thereafter the temperature has generally been steadily falling, however, superimposed by many cold and warm periods, including the modern warm period.Temperature variations in Holocene compared with the preceding interglacials - The vertical scale show the temperature on the ice surface, and the horizontal time scale is in thousands of years before present.It can be seen the Holocene temperature graph has a different shape than the previous interglacial periods.Holocene represents the present, which basically is a Pleistocene interglacial period.