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Depression denotes a low pressure system, which occurs when the weather is dominated by unstable conditions. Under a depression, air is rising, forming an area of low pressure at the surface. This rising air cools and condenses and helps encourage cloud formation, so the weather is often cloudy and wet. Thus depression is an area of low atmospheric pressure characterized by rain and unstable weather.
There had been total 63 depressions/deep depressions formed over the North Indian Ocean during 2000-2012 with a range from 2 to 8 depressions/deep depressions per year and an annual average of 4.85 depressions/deep depressions.
The year/years having occurrence of maximum number of depressions/deep depressions formed over the North Indian Ocean during 2000-2012 were: 2006 and 2007 with 8 depressions/deep depressions each. The year/years having occurrence of minimum number of depressions/deep depressions formed over the North Indian Ocean 2000-2012 were: 2000 and 2001 with only 2 depressions/deep depressions each.
The detailed analysis of periodical/month wise data shows that the maximum number of depressions/deep depressions formed over the North Indian Ocean during 2000-2012 had occurred in the period of June-September, which accounted for 34 depressions/deep depressions (53.97%) out of the total 63 depressions/deep depressions formed over the North Indian Ocean during 2000-2012. The period of June-September had an average of 2.62 depressions/deep depressions per year.
The period of October-December accounted for 24 depressions/deep depressions (38.10%) out of the total 63 depressions/deep depressions formed over the North Indian Ocean during 2000-2012. The period of October-December had an average of 1.85 depressions/deep depressions per year.
The minimum number of depressions/deep depressions formed over the North Indian Ocean during 2000-2012 had occurred in the period of January-February, which accounted for just 2 depressions/deep depressions (3.17%) out of the total 63 depressions/deep depressions formed over the North Indian Ocean during 2000-2012. The period of January-February had an average of mere 0.15 depressions/deep depressions per year.