Freezing of Lakes - Freezing of Lakes and the Evolution of their Ice Cover - page 13

Fig. 2.1 Mean a January and b July air temperature ( ° C) on the Earth ' s surface, 1959 - 1997 (Global
climate animations, Department of Geography, University of Oregon based on NCEP/NCAR
Reanalysis Project 1959 - 1997 Climatologies data, see http://geography.uoregon.eduenvchange/
clim_animations/index.html ) . © Department of Geography, University of Oregon