Pre monsoon season commences from March and continues until May. Rain activities over Delhi NCR as well as most parts of North India remains on the lower side during March and April. Average rainfall for Delhi in the month of March is 15.9 mm and for April it is just 13 mm.
Temperatures start increasing significantly during the latter part of April and pre monsoon activities intensify over Punjab, Haryana, west Uttar Pradesh, Rajasthan and Delhi NCR. These pre monsoon activities usually occur in the form of dust storm and sandstorm accompanied with lightning strike thunderstorm and light rain. The month of May is most ferocious in terms of violent thunderstorm and dust storm.
During March 2022, we have not seen any significant pre-monsoon activity over the northern plains. The absence of Pre monsoon rain is responsible for heat wave during March. Intensity and frequency of Western disturbances are reducing and there is no weather system developing over northern plains. Moisture feed is also unavailable from Bay of Bengal or Arabian Sea. Therefore, conditions are not becoming favourable for commencement of any pre monsoon activity over North India until first 10 days of April.