Pre-monsoon activity starts making advances in Delhi from April onward. The maximum temperature invariably crosses 40 degrees and this mostly happens during the second half. In the last 10 years, since 2009, the temperature exceeded 40 degrees except in 2012, when the maximum temperature got arrested at 38.7 degrees. In these last 10 years, the highest temperature of April was 43.7 degrees recorded on 18 April 2010. Also, three times of the last 10 years, the temperature exceeded 43 degrees.
The earliest date in the last 10 years was 09 April 2010, when the temperature reached 40 degrees. The table gives an idea of these extreme temperatures for Delhi in April.
Due to the passage of frequent western disturbances this season, the temperature mostly remained below normal in March. The maximum temperature could touch 35 degrees mark only on 06 Apr. The highest temperature so far has touched 37.2 degrees on 12 Apr. The further rise in temperature is likely and possibly Delhi NCR would score 40 degrees in this week itself.