Bonjour !
Sinon via vba tu peux faire :
If Cells(1, 1) <= 24 And Cells(1, 1) >= 13 Then
Cells(1, 1).Interior.Color = RGB(255, 0, 0)
End If
If Cells(1, 1) <= 35 And Cells(1, 1) >= 25 Then
Cells(1, 1).Interior.Color = RGB(255, 160, 0)
End If
If Cells(1, 1) <= 45 And Cells(1, 1) >= 36 Then
Cells(1, 1).Interior.Color = RGB(255, 255, 0)
End If