Jason France, the Weller wlc100 is a variable temperature soldering station. "The tip temperature can be adjusted by varying the power level of the heater. The temperature can be adjusted anyway from 5 to 40 watts with the knob on base unit" (from user manual).
Set power control knob to В“5В” to heat tool up quickly. Wait 1 minute. Lower settings take longer to reach operating temperature. Adjust control to a lower setting. Remove tool from holder and tin tip with solder. Unit is now ready for use. Always use the lowest power setting that will handle the load you are soldering. By using lower settings and properly selecting tip styles, sensitive components will be protected from heat damage. So there really are no direct temp settings. Always adjust your iron down once you have it hot, to get to the temp where it melts the solder. I think the max temp on the Weller is 900deg. at 40W, each settings should be about 180deg. Now you need to know which solder you use and determine that particular melting point. Honestly, I never had to use it based on temperature, but I always base it on when the solder melts. Do not forget to tin the tip. Hope this helps, good luck.