def vent_fluix(df, llindar):
    vtemp = df['TEMP_MAX'] - df['TEMP_MIN']
    df2 = df[vtemp > llindar]
    if len(df2) > 0:
        return df2['V_VENT_MITJ'].idxmin()
    else:
        return -1

def dir_vent_pluja(df):
    gb = df.groupby('DIR_VENT')
    sumapluja = gb['PRECIPITACIO'].sum()
    return dict(sumapluja)