India witness different shades of weather all along the year, that too varying from region to region. We can count January-March as the winter months, April-June as Pre-Monsoon, July-September is taken as Monsoon and then October-December it is the Post-Monsoon season. This is the broad classification for the Indian region.
In North India, there is a large distinction in weather conditions especially during winters in comparison to Central and South India. Practically we say that there are six months of winters for Delhi, i.e. January-March and then October-December. The Pre-Monsoon is from April-June.
Monsoon generally arrives at the fag end of June and sometimes even spills over to the first week of July. Then, July- September is tagged as the Monsoon season. However, the official withdrawal date of Southwest Monsoon is September 10 but then it is delayed and goes up till the second half of September.
Post Southwest Monsoon withdrawal, wintry touch starts coming in and can be experienced in the second half of October during evening. November too has a wintry touch to it wherein, both day and night are cold. Months of December, January and February are termed as core wintry months for Delhi-NCR wherein, March remains chilly during late evening and night. The winters are at its peak from December 15 up till January 31. In all, there are 45 days of peak winters in national territory and its adjoining areas.
Delhi experiences about 762 mm of average annual rains. Out of this, little over 10% is experienced in Winter months, little over 15% in Pre-Monsoon and rest less than 75% is during Monsoons. Thus, we can say that three-fourth of annual rainfall takes place in just about three months of Monsoon season. But invariably we find that the distribution remains skewed on various accounts.
From, January- March 2018, only 5.5 mm of rains have been recorded and from October-December 2018, 10.4 mm of rains have been recorded. In total, about 16 mm of rains were observed during the winters of 2018 which comes to just about two percent of annual rainfall against the normal of 10%.
If the Pre-Monsoon months are put together, then Delhi witnessed 80 mm of rains which is around 10% against the normal of 15%. As per the records and figures, the Monsoon season 2018 has been pretty good. Total rains recorded this Monsoon season has been 88%, out of which July, August and September recorded 286 mm, 207 mm and 238 mm of rains, respectively, altogether counted 731 mm of rains.
Delhi very frequently witnesses such good rains during Monsoon, thus Monsoon 2018 proved as a boon for Delhi.
By looking at the figures, it seems that the Winter rains 2018 was a total let down, whereas, Monsoons performed very well this time for Delhi. January, February, March 2018 were warmer and similar weather conditions pertained during the months of October and November 2018 as well. The first half of December 2018 was also little warm, but in the second half we have had a prolonged spell of below average temperatures. All in all, December witnessed temperatures a little shade below normal and months of October and November were above normal.
Image Credit: Pro Kerala
Please Note: Any information picked from here must be attributed to skymetweather.com