Clearness Rn estimation formulae | N | ET (mm) | b | R2 | d | MRE (mm) | EF | Rn (MJ·m−2) | b | R2 | d | MRE (MJ·m−2) | EF |
| Clear sky |
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| ET (Rnmedido) | 692 | 4.5bc | - | - | - | - | - | 10.2c | - | - | - | - | - |
| ET (RnBRUNT) | 692 | 3.9d | 0.879 | 0.926 | 0.992 | 0.6 | 0.976 | 7.8d | 0.775 | 0.806 | 0.964 | 2.4 | 0.912 |
| ET (RnFAO-24W) | 692 | 4.0d | 0.886 | 0.927 | 0.993 | 0.5 | 0.978 | 7.9d | 0.788 | 0.808 | 0.967 | 2.3 | 0.919 |
| ET (RnFAO-24D) | 692 | 4.6c | 1.004 | 0.933 | 0.998 | 0.1 | 0.994 | 10.4c | 0.998 | 0.816 | 0.994 | 0.2 | 0.974 |
| ET (RnFAO-56) | 692 | 4.7bc | 1.025 | 0.960 | 0.999 | 0.1 | 0.993 | 10.8b | 1.038 | 0.890 | 0.995 | 0.6 | 0.970 |
| ET (RnRs) | 692 | 5.7a | 1.250 | 0.917 | 0.983 | 1.2 | 0.903 | 15.3a | 1.443 | 0.743 | 0.948 | 5.1 | 0.593 |
| Scattered clouds |
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| ET (Rnmedido) | 127 | 4.4bc | - | - | - | - | - | 10.4c | - | - | - | - | - |
| ET (RnBRUNT) | 127 | 4.0d | 0.918 | 0.856 | 0.996 | 0.3 | 0.988 | 9.0d | 0.857 | 0.605 | 0.985 | 1.4 | 0.959 |
| ET (RnFAO-24W) | 127 | 4.0d | 0.924 | 0.859 | 0.997 | 0.3 | 0.989 | 9.1d | 0.867 | 0.612 | 0.987 | 1.3 | 0.962 |
| ET (RnFAO-24D) | 127 | 4.4c | 0.994 | 0.896 | 0.998 | 0.01 | 0.994 | 10.4c | 0.988 | 0.698 | 0.995 | 0.01 | 0.979 |
| ET (RnFAO-56) | 127 | 4.5bc | 1.030 | 0.932 | 0.990 | 0.2 | 0.993 | 11.1b | 1.047 | 0.809 | 0.995 | 0.65 | 0.974 |
| ET (RnRs) | 127 | 5.2a | 1.184 | 0.910 | 0.991 | 0.8 | 0.954 | 13.9a | 1.318 | 0.786 | 0.976 | 3.5 | 0.847 |
| Broken clouds |
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| ET (Rnmedido) | 155 | 3.2d | - | - | - | - | - | 7.3e | - | - | - | - | - |
| ET (RnBRUNT) | 155 | 3.3d | 1.017 | 0.877 | 0.996 | 0.1 | 0.971 | 7.7e | 1.028 | 0.633 | 0.989 | 0.4 | 0.932 |
| ET (RnFAO-24W) | 155 | 3.4d | 1.021 | 0.880 | 0.996 | 0.1 | 0.971 | 7.8d | 1.037 | 0.643 | 0.989 | 0.5 | 0.929 |
| ET (RnFAO-24D) | 155 | 3.5c | 1.075 | 0.912 | 0.994 | 0.3 | 0.959 | 8.5c | 1.137 | 0.746 | 0.984 | 1.2 | 0.873 |
| ET (RnFAO-56) | 155 | 3.6bc | 1.103 | 0.928 | 0.992 | 0.4 | 0.947 | 8.9bc | 1.184 | 0.817 | 0.979 | 1.6 | 0.799 |
| ET (RnRs) | 155 | 4.0a | 1.219 | 0.882 | 0.986 | 0.7 | 0.908 | 10.4a | 1.410 | 0.767 | 0.962 | 3.1 | 0.726 |
| Overcast |
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| ET (Rnmedido) | 89 | 1.8c | - | - | - | - | - | 3.7c | - | - | - | - | - |
| ET (RnBRUNT) | 89 | 2.1ab | 1.142 | 0.927 | 0.987 | 0.3 | 0.922 | 5.1b | 1.223 | 0.760 | 0.932 | 1.3 | 0.530 |
| ET (RnFAO-24W) | 89 | 2.1ab | 1.145 | 0.929 | 0.986 | 0.3 | 0.920 | 5.1b | 1.231 | 0.766 | 0.930 | 1.4 | 0.516 |
| ET (RnFAO-24D) | 89 | 2.2ab | 1.186 | 0.941 | 0.981 | 0.4 | 0.887 | 5.5b | 1.325 | 0.818 | 0.909 | 1.8 | 0.278 |
| ET (RnFAO-56) | 89 | 2.4a | 1.262 | 0.949 | 0.964 | 0.6 | 0.710 | 6.3a | 1.448 | 0.866 | 0.874 | 2.5 | 0.826 |
| ET (RnRs) | 89 | 2.4a | 1.294 | 0.872 | 0.959 | 0.6 | 0.800 | 6.4a | 1.628 | 0.777 | 0.888 | 2.7 | 0.120 |