Can you use MAX function on numbers/text?

I am trying to use the "MAX" function to find the max temp on a particular day in a week from 7 separate sheets. The problem I have is one particular company autopopulates their temperature block with the temp and degree symbol: 46°F instead of just 46. The max function is thrown off it appears by the symbol and letter. Is there a way to get the max function to only look at the numbers? I'm also open to the option of autoconverting each temp to a number on the master sheet and letting the "MAX" function search through those if that's possible. Thanks in advance.