SUM(Value) Group By After PIVOT

Hi everybody (happy merry christmas)

I have the following query for Pivot, that works nice.

WITH PivotData AS 
( 
SELECT fechaHora, idWatimetro, semana, hora, minuto,dia,mes ,ano,valor
FROM   E_Registros_Watimetros 
) 
SELECT * 
FROM PivotData 
PIVOT(SUM(valor) FOR idWatimetro IN ([1],[2],[3],[4],[5],[6],[7],[8],[9],[10]) ) AS P order by fechaHora, semana,dia,mes;

But now, I must be able to get Sum(valor) for every month or days or weeks or Year, but I´m trying without success, any help will be nice

Thank you for your time.