-- 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.
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).
But the datasets are not flawless (biases can occur, for example, when stations are being relocated, or when instrumentation is exchanged) and their monthly resolution is too coarse for studies of fine - scale climate features such as changes
in daily temperature extremes.