 As expected, Buck's equation for > 0 °C is significantly more accurate than Tetens, and its superiority increases markedly above 50 °C, though it is more complicated to use.The Buck equation is even superior to the more complex Goff-Gratch equation over the range needed for practical meteorology.For serious computation, Lowe (1977) developed two pairs of equations for temperatures above and below freezing, with different levels of accuracy.