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Table 2 Monthly climatology of ETo values (mm/day) calculated by six empirically based methods and FAO-56 PM during 1967 – 1982

From: A comparative analysis of reference evapotranspiration from the surface of rainfed grass in Yaounde, calculated by six empirical methods against the penman-monteith formula

Month Methods (mm/day)
Turc’s [23] Stephens and Stewart [22], modified by Jensen and Haise Blaney and Criddle [6] Blaney and Criddle modified by Shih et al., [21] Papadakis [15] P.M modified by Frere and Popov [9] FAO-56 P.M
Jan 8.7 3.09 5.06 5.7 0.31 13.12 3.3
Feb 9.44 3.45 5.8 6.96 0.39 15.48 3.63
Mar 8.82 3.18 5.25 5.81 0.32 13.54 3.58
Apr 8.6 3.03 5.31 5.79 0.33 14 3.42
May 8.32 2.94 5.23 5.42 0.28 12.97 3.32
Jun 7.1 2.42 5.29 4.65 0.23 11.82 2.92
Jul 6.17 2.03 5.03 3.81 0.22 10.53 2.61
Aug 5.96 1.95 4.99 3.66 0.2 10.45 2.59
Sep 6.82 2.3 5.19 4.44 0.24 11.83 2.9
Oct 7.56 2.6 5 4.84 0.26 12.21 3.07
Nov 8.67 3.06 5.19 5.85 0.28 13.64 3.3
Dec 8.69 3.07 5.02 5.68 0.28 13.07 3.27
Average 7.9 2.76 5.2 5.22 0.28 12.72 3.16