It depends on the way the crystal is cut, usually they are optimized to have a maximum around room temperature so that effects from variations are minimized. Th

It depends on the way the crystal is cut, usually they are optimized to have a maximum around room temperature so that effects from variations are minimized. The effects might partly be compensated by measuring the temperature and applying a correction to the data since the temperature dependency is known, but the sensitivity is also affected. So, temperature control is definitely important for accurate measurements.