Abstract: It is provided aA method for estimating the presence of rain characterized by comprising including the steps of entering a set of static parameters, entering a set of dynamic parameters, measuring an instant value, sending said the values to a first Kalman filter and to a second Kalman filter and define defining the start of a precipitative event if a difference between said the KalmanST output and said the KalmanFT output exceeds said the “epsilonStart” threshold value and also define the term of a precipitative event if a difference between said the KalmanST output said the said KalmanFT output is lower than said the “epsilonStop” threshold value.