The hot junction of a bare thermocouple, initially at room temperature $(30^\circ{C})$, is suddenly dipped in molten metal at $t=0$ $s$. The cold junction is kept at room temperature. The thermocouple can be modeled as a first-order instrument with a time constant of $1.0$ $s$ and a static sensitivity of $10$ $\mu{V}/^\circ{C}$. If the voltage, measured across the thermocouple indicates $10.0$ $mV$ at $t=1.0$ $s$, then the temperature of the molten metal in $^\circ{C}$ is _____________.