A study, Bhattacharya et al. discovered that every year, the number of days with abnormally high temperatures rises during the summer while the number of days with unusually low temperatures falls during the winter. 

The scientists discovered that the frequency of heat wave episodes is rising at a pace of 0.6 incidents every ten years. 

The researchers discovered that the frequency of cold waves is dropping by 0.4 occurrences every ten years. 

The authors highlight the divergent patterns of heat waves and cold waves. 

For instance, across the arid and semi-arid climatic region, heat waves are more frequent whereas cold waves are less frequent.