Option Explicit
Function Température(chn$) As Double
Dim p1%, p2%
p1 = InStrRev(chn, "Température,", -1, 1): If p1 = 0 Then Exit Function
p2 = InStrRev(chn, "C°,", -1, 1): If p2 = 0 Then Exit Function
p1 = p1 + 12: Température = Val(Mid$(chn, p1, p2 - p1 - 1))
End Function