| Year | Thornthwaite | Penman-Monteith FAO 56 | ||||||
| R2 | Nash | RMSE* | CVE** | R2 | Nash | RMSE* | CVE** | |
| 1968 | 0.88 | 0.84 | 0.04 | 1.26 | 0.81 | 0.76 | 0.07 | 0.88 |
| 1969 | 0.98 | 0.95 | 0.04 | 1.04 | 0.93 | 0.93 | 0.14 | 0.69 |
| 1970 | 0.93 | 0.92 | 0.03 | 1.01 | 0.9 | 0.9 | 0.05 | 0.85 |
| 1971 | 0.91 | 0.9 | 0.03 | 1.05 | 0.91 | 0.91 | 0.03 | 1.03 |
| 1972 | 0.89 | 0.88 | 0.02 | 1.24 | 0.76 | 0.76 | 0.05 | 0.93 |
| 1973 | 0.92 | 0.85 | 0.04 | 1.4 | 0.9 | 0.84 | 0.07 | 1.15 |
| 1974 | 0.95 | 0.9 | 0.03 | 0.9 | 0.93 | 0.9 | 0.05 | 1.1 |
| 1975 | 0.98 | 0.98 | 0.04 | 0.98 | 0.96 | 0.96 | 0.12 | 0.75 |
| 1976 | 0.95 | 0.94 | 0.02 | 0.97 | 0.9 | 0.88 | 0.04 | 0.7 |
| 1977 | 0.94 | 0.91 | 0.03 | 1 | 0.87 | 0.84 | 0.03 | 0.83 |
| 1978 | 0.95 | 0.94 | 0.01 | 0.84 | 0.96 | 0.93 | 0.02 | 0.87 |
| 1979 | 0.97 | 0.86 | 0.05 | 0.79 | 0.93 | 0.84 | 0.09 | 0.8 |
| 1980 | 0.97 | 0.93 | 0.03 | 0.65 | 0.93 | 0.9 | 0.04 | 0.68 |
| 1981 | 0.94 | 0.91 | 0.03 | 0.97 | 0.94 | 0.91 | 0.02 | 1.01 |
| 1982 | 0.94 | 0.91 | 0.04 | 0.66 | 0.97 | 0.91 | 0.03 | 0.92 |
| 1983 | 0.95 | 0.95 | 0.02 | 0.92 | 0.91 | 0.9 | 0.03 | 0.94 |
| 1984 | 0.98 | 0.94 | 0.02 | 0.85 | 0.97 | 0.9 | 0.05 | 0.68 |
| 1985 | 0.82 | 0.71 | 0.06 | 0.65 | 0.73 | 0.5 | 0.09 | 0.54 |
| 1986 | 0.69 | 0.36 | 0.13 | 0.75 | 0.6 | 0.2 | 0.12 | 0.89 |
| 1987 | 0.58 | 0.46 | 0.21 | 0.77 | 0.48 | 0.32 | 0.28 | 0.81 |
| 1988 | 0.95 | 0.95 | 0.04 | 0.84 | 0.93 | 0.91 | 0.07 | 1.02 |
| 1989 | 0.96 | 0.78 | 0.09 | 0.94 | 0.94 | 0.69 | 0.09 | 1.05 |
| 1990 | 0.94 | 0.71 | 0.09 | 0.84 | 0.9 | 0.57 | 0.1 | 0.94 |
| 1991 | 0.86 | 0.63 | 0.08 | 1 | 0.74 | 0.46 | 0.1 | 1.01 |
| 1992 | 0.86 | 0.71 | 0.1 | 0.62 | 0.85 | 0.63 | 0.11 | 0.68 |
| 1993 | 0.84 | 0.7 | 0.08 | 0.81 | 0.82 | 0.6 | 0.11 | 0.8 |
| 1994 | 0.73 | 0.59 | 0.08 | 1 | 0.61 | 0.34 | 0.11 | 1.17 |
| 1995 | 0.91 | 0.81 | 0.06 | 1.04 | 0.9 | 0.7 | 0.1 | 0.96 |
| 1996 | 0.86 | 0.24 | 0.13 | 0.75 | 0.78 | −0.02 | 0.17 | 0.78 |
| 1997 | 0.77 | 0.26 | 0.17 | 0.91 | 0.72 | 0.11 | 0.18 | 0.95 |
| 1998 | 0.71 | 0.69 | 0.47 | 0.94 | 0.53 | 0.51 | 0.68 | 1.02 |
| 1999 | 0.96 | 0.88 | 0.08 | 0.81 | 0.93 | 0.79 | 0.1 | 0.82 |