Updated for more waxes and some stats on wax temp ranges.  

There is not a standard definition for surf wax temperature ranges, but there is a defacto basic standard that many waxes conform to.  This is a summary table of many available surf waxes and the temperature ranges of the waxes.  

Check out this site to see just about every surf wax ever made. Surf Wax Museum

Most surf waxes break temperature into some broad categories of cold, cool, warm, and tropical.  There are a few special cases of "Frigid" and no temperature range at all.  These are some table of temperature ranges in degrees Fahrenheit and Celsius.  

Surf Wax Temperature Ranges in Fahrenheit

Notes

1) Data from surfwax collector Randy Gibbs, Gibbs Surfboards, (714) 356-1446, gibbssurfboards@aol.com.  Thanks Randy!  

2) Note that the Terra Wax data in Fahrenheit was converted from data in Celsius.  See the conversion table at the end of this page for simple conversions between Celsius and Fahrenheit.  

3) The advertised upper range for Wax-Man Tropical of "boiling" is literally 212 degrees F.  Perhaps this is an overstatement.  I have not checked this.  

For those that prefer Celsius, here is the same data table in those units.  For this table, I had to convert data from Fahrenheit to Celsius for Murph's, Bubble Gum, Sharkbait, and Wax-Man.  

Surf Wax Temperature Ranges in Celsius

Note that Kronic claims it's wax is good at all temperatures, so I noted this as a "YES" in all temperature ranges.  

Surf Wax Temperature Range Statistics  

If you look at how the temperature ranges for the various brands of wax are set, you can see overlap between what one brand calls the same temperature.  I analyzed the Fahrenheit data and found the average and standard deviations for this data.  This shows a rough average industry "range" for what each temperature is.  

This is the conversion table from Celsius to Fahrenheit.