slicer

Do you want to take all the values, or only the Min and Max value before the Min_Hour? 

If you want to take all values in form of tables, then you can use the following, 

var _MinHour = MIN (Table[Hour])
var _MaxHour = MAX (Table[Hour])

_UnderMin = 
    FILTER(
        DISTINCT (ALL(Table[Hour])), 
        Table[Hour] < _MinHour
    )

_AboveMax = 
    FILTER(
        DISTINCT (ALL(Table[Hour])), 
        Table[Hour] > _MaxHour
    )

The _UnderMin will return you all the values below the Minimum selected value and _AboveMax will return all the values greater than the selected value. 

If you want the Minimum value (0), Max value below the Selected Minimum Value, Minimum value selected above the Selected Max Value (24) and the Max Value, you can use the following DAX Codes, 

var _MinHour = MIN (Table[Hour])
var _MaxHour = MAX (Table[Hour])

_MinHourAllValues = MIN (ALL(Table[Hour]))
_MaxHourAllValues = MAX (ALL(Table[Hour]))

_Max_Value_Below_Minimum = 
    MAXX (
        FILTER (
               ALL(Table),
                
        Table[Hour]
    )
    
_Max_Value_Below_Minimum = 
    MAXX (
        FILTER (
            DISTINCT (ALL(Table[Hour])), 
            Table[Hour] < _MinHour
        ), 
        Table[Hour]
    )
    
_Min_Value_Above_Maximum = 
    MINX (
        FILTER (
            DISTINCT (ALL(Table[Hour])), 
            Table[Hour] > _MaxHour
        ), 
        Table[Hour]
    )