Parse the pressure and return FC (numerical).

def __getBarFC(pressure):
    """Parse the pressure and return FC (numerical)."""
    if pressure is None:
        return 0
    press = __to_float1(pressure)
    if press < 974:
        return 1
    if press < 990:
        return 2
    if press < 1002:
        return 3
    if press < 1010:
        return 4
    if press < 1022:
        return 5
    if press < 1035:
        return 6
    return 7