HOMOGENIZATION OF SWEDISH TEMPERATURE DATA .3. THE LONG TEMPERATURE RECORDS FROM UPPSALA AND STOCKHOLM

The temperature records from Uppsala, beginning in 1722, and from Stoc kholm, beginning in 1756, are subjected to homogeneity tests against h omogenized reference series for the period 1861-1994. Both records hav e been affected by urbanization during the test period. The data are c orrected for urban bias and for a few other non-homogeneities. The hom ogenized temperature records are considered to be reliable indicators of the temperature variations in southern Sweden, although individual temperature values are less accurate before the 1860s, particularly be fore the 1750s. Annual mean temperatures as well as seasonal mean temp eratures in the winters, summers and autumns during the recent 30-year period, 1966-1995, were not significantly different from those of the pre-industrial 100-year period 1761-1860. Springs have become signifi cantly warmer compared with that period and have featured a steady war ming trend since the 1880s. The annual temperature range during 1966-1 995 was significantly smaller than that during 1761-1860; thus the tem perature climate has become more maritime. (C) 1997 by the Royal Meteo rological Society.