Guess I should have checked dark side surface temperature first. Whoops!
From the Wikipedia:
The surface of Venus is effectively isothermal; it retains a constant temperature not only between day and night but between the equator and the poles. The planet's minute axial tiltless than 3°, compared to 23° on Earthalso minimizes seasonal temperature variation. The only appreciable variation in temperature occurs with altitude. The highest point on Venus, Maxwell Montes, is therefore the coolest point on the planet, with a temperature of about 655 K (380 °C) and an atmospheric pressure of about 4.5 MPa (45 bar).