Why did Delhi have only 13 days of heat wave from March till May officially? https://ift.tt/iKnIak7

Delhi-NCR and almost all areas of northwest India had experienced at least five spells of heat waves after the last significant rainfall on February 25. The latest round was from May 11 onwards till the thunderstorm with moderate rainfall cooled down the national capital. Now, the question is why, even when the mercury rose several notches higher across many stations in Delhi for multiple days, is Delhi having only 13 days of heat waves officially?