knowledge

Rainfall down by almost 50%

According to the Portuguese Institute of the Sea and the Atmosphere (IPMA), a hydrological year is between October 1st and September 30th of the following year and so far, according to IPMA data, the 2021/2022 hydrological year is the second driest since 1931 (since records began), only surpassed by the hydrological year 2004/2005.

According to an official IPMA source, so far this hydrological year has had 419 millimetres (mm) of rain, 51% of what would be a normal value.

With all of mainland Portugal in drought, 55% in severe drought class and 45% in extreme drought, the IPMA considers that the drought “would have a significant amelioration” if in the next two months it rained above average. But it adds that this only happens in 20% of the years.

In average terms, in September in October, for the situation to improve, something like 150mm in September and 175mm in October.

Although it rained in the spring of this year, in some regions above average in March, according to preliminary results from the spring climate report, rainfall in the season corresponded to 80% of normal.