Table 5. External validation results of the Modified Single Model (MSM) and Local Model (LM) using four years’ bloom dates observed at 16 additional sites, which were not included in model development. RMSE: Root mean square error.
| Site | Model |
| MSM | LM |
| RMSE | Bias | RMSE | Bias |
| North Gangneung | 3.57 | -3.25 | 4.06 | -3.50 |
| Guri | 7.30 | -7.25 | 7.04 | -7.00 |
| Munmak | 6.61 | -6.25 | 3.08 | -3.00 |
| Yeoju | 6.65 | -6.25 | 5.22 | -4.75 |
| Yongin | 3.11 | -2.33 | 2.38 | -2.33 |
| Icheon | 3.16 | -2.67 | 3.11 | -3.00 |
| Pyeongtaek | 3.12 | -1.75 | 3.81 | -3.50 |
| Asan | 3.64 | -3.25 | 2.55 | -2.50 |
| Gongju | 6.76 | -6.25 | 1.32 | -0.75 |
| Nonsan | 4.61 | -4.25 | 0.71 | 0.00 |
| Yeosan | 4.58 | -4.00 | 2.12 | -1.50 |
| Jeonju | 6.42 | -6.25 | 5.27 | -5.25 |
| Buan | 6.89 | -6.50 | 7.52 | -7.50 |
| Baekyangsa | 6.52 | -6.50 | 2.29 | -1.75 |
| Jangseong | 2.69 | -0.75 | 1.22 | -0.50 |
| Gwangju | 5.74 | -4.50 | 1.12 | 0.25 |