Calibration of TRMM rainfall climatology over Saudi Arabia during 1998-2009

► Rainfall was obtained from TRMM data for the period 1998 -2009 over Saudi Arabia. ► Between the TRMM and the rain-gauge data r is 0.90 with a 99% level of significance. ► TRMM overestimates rainfall over Saudi Arabia, particularly over the coastal areas. ► After calibration, TRMM-measured rainfall is almost close to the observed data.