Why these winters are not wintery enough

Subject : Geography

Context-

The days have been unusually warm for winter this December with the maximum temperature remaining above normal.
This is the second-highest maximum temperature for December from 2015 onwards, India Meteorological Department (IMD) data shows.

Reason-

As per the IMD, fewer western disturbances are affecting the region this year.

What are western disturbances-

Western Disturbances develop in the mid-latitude region (north of the Tropic of Cancer), not in the tropical region, therefore they are called mid-latitude storms or extra-tropical storms.
It is a term coined by an Indian Meteorologist for the weather phenomenon which is propagated from the West.
The phrase Western Disturbance was first used in published literature in 1947. However, its precursor Winter Disturbance was coined earlier in 1931.
Western Disturbances are low-pressure systems, embedded in western winds (westerlies) that flow from west to east.
The low pressure typically forms over the Mediterranean Sea and travels over Iran, Iraq, Afghanistan, and Pakistan before entering India loaded with moisture.
These moisture-laden western disturbances eventually come up against the Himalayas and get blocked, as a consequence, the moisture gets trapped and precipitation is shared in the form of snow and rain over Northwest India and sometimes, other parts of North India.
An average of 4-5 western disturbances form during the winter season and the rainfall distribution and amount varies with every western disturbance.
Sometimes, when western disturbances become more intense in the Indian Region, they can extend even up to 15 degrees north, resulting in rainfall up to north Maharashtra, Gujarat, and the entire Madhya Pradesh to the south.

Impact

It causes the most winter and pre-monsoon season rainfall across North-West India.
This phenomenon is usually associated with a cloudy sky, higher night temperatures, and unusual rain. It is estimated that India gets close to 5-10% of its total annual rainfall from western disturbances.
In winter, western winds bring moderate to heavy rain in low-lying areas and heavy snow to mountainous areas of the Indian subcontinent.
Precipitation during the winter season has great importance in agriculture particularly for rabi crops including wheat, barley, mustard, gram, lentil, etc.
They start declining after winter. During the summer months of April and May, they move across North India and at times help in the activation of monsoon in certain parts of northwest India.
During the monsoon season, western disturbances may occasionally cause dense clouding and heavy precipitation.
Weak western disturbances are associated with crop failure and water problems across north India.
Strong western disturbances can help residents, farmers and governments avoid many of the problems associated with water scarcity.