"Cyclone frequency" refers to how often cyclones, which are powerful rotating storms, occur within a specific time period. It is a measure of how frequently these types of storms happen. Full definition
For future projections, GFDL atmospheric modelers have developed global models capable of simulating many aspects of the seasonal and year - to - year variability of tropical cyclone frequency in a number of basins, using only historical sea surface temperatures as input. (gfdl.noaa.gov)
Tracking changes in Arctic cyclone activity through time, Vavrus calculated a statistically significant, though minor, increase in extreme Arctic cyclone frequency over the study period, with increases strongest near the Aleutian Islands and Iceland. (sciencedaily.com)
Trends in Northern Hemisphere surface cyclone frequency and intensity. (nsidc.org)