The frequency of daily temperature extremes has also changed since 1910. (bom.gov.au)
-- It is virtually certain that increases in the frequency of warm daily temperature extremes and decreases in cold extremes will occur throughout the 21st century on a global scale. (dotearth.blogs.nytimes.com)
Analysis of long - term changes in daily temperature extremes has recently become possible for many regions of the world (parts of North America and southern South America, Europe, northern and eastern Asia, southern Africa and Australasia). (ipcc.ch)