The handle on the lid of Le Creuset roasters is usually made of stainless steel, which makes it heat-resistant. The newer models in the Signature series have a stainless steel lid knob that is ovenproof, but the exact temperature resistance of the handle itself is not explicitly stated. In general, however, Le Creuset roasters are suitable for use in the oven up to 260 degrees Celsius.

If you need specific information on the heat resistance of the handle, I recommend consulting the official Le Creuset documentation or asking the manufacturer directly.