Tomorrow will be the last trading day (LTD) of May.
As explained in the 2013 edition of the Almanac the LTDs of months used to be stronger than average, but in recent years they have been weak. This is quite different from the first trading days of months which strongly out-perform the average for all days, and where the effect has strengthened in recent years.
Since 1984 the market has on average risen 0.08% on the LTD of May, which makes it 8th in the ranking of month LTDs.
Since 2000, however, it has been the 4th strongest month LTD, with an average return of 0.17% on the day.
The following chart shows the FTSE 100 Index returns for every May LTD since 1984.