In news : India Meteorological Department (IMD) released monthly climate summary for winter recently
Key highlights of the report
- According to IMD, India recorded its second warmest winter this year since 1901
- January and February are considered the winter months in India.
- Both the minimum and mean temperatures in February for northwest India were warmest since 1901
- It said that the minimum temperature recorded in the past two months was 15.39 degrees Celsius against a normal of 14.59 degrees Celsius, which was 0.79 degrees (rounded off) above normal for the season (See box).
- The maximum temperature in the same period was 27.47 degrees Celsius, 0.47 degrees above normal.
- It further mentioned that the 2016 winter holds the record for the warmest ever winter in India with minimum temperature departure from normal recorded at 0.94 degrees Celsius.
- Other years in which winters were especially warm between 1901 and 2021 were 2009 (0.71 degrees above normal), 1926 (0.70 degrees above normal) and 1912 (0.69 degrees above normal).
- In terms of mean temperature, the 2021 winter stood third warmest after the 2016 and 2009 winters.
- The mean temperature this year was 21.43 degrees Celsius versus a normal of 20.65 degrees Celsius.
- According to IMD, the minimum temperature recorded in the country during the month was the warmest for the month in 62 years.
What are the reasons for warmer winters?
Following are the stipulated reasons for warmer winters:
- The easterly winds remained dominant through the winter season, which persistently kept the minimum temperatures above normal
- Most western disturbances crossed over along the extreme northern regions like Jammu and Kashmir, failing to bring cold weather over the northern plains.
- Some cold winds that developed later got obstructed by the moisture-laden easterlies, all of which contributed to such a warm season over the country
- This season, less than five coldwave events developed over north India, which instead experienced prolonged fog conditions.
Wet winters in South peninsular
- January 2021 began on an unusually wet note over North India. Tamil Nadu, Kerala and Puduchhery also experienced an extremely wet January.
- The rainfall departure for the southern peninsula in the winter season is 246 per cent over what is recorded normally, adding to the overall country’s mean temperature figures.
- The latest report of IMD also states that South Peninsular India recorded its fourth wettest winter season with collective rainfall recorded measuring 56.1 mm in January and February.
- Generally, these months are dry over the south. Previous wet winter seasons over the south peninsula were in 1901 (61 mm), 1986 (59.9 mm) and 1984 (59.2 mm).