 In contrast, San Francisco has cool summers with daily highs around due to the continuous upwelling of cold subsurface waters along the coast.Because most regions with a Mediterranean climate are near large bodies of water, temperatures are generally moderate with a comparatively small range of temperatures between the winter low and summer high (although the daily range of temperature during the summer is large due to dry and clear conditions, except along the immediate coasts).Temperatures during winter only occasionally fall below the freezing point and snow is generally seldom seen.