**Appendix A**

**Table A1.** Descriptive statistics values for real dataset Z(t), forecasting values of AVG and EB methods for the three cities (validation).


**Table A2.** Descriptive statistics values for real dataset Z(t), forecasting values of AVG and EB methods for the three cities (testing).


**Table A3.** Case (A)-Calculated errors and weights for each ensemble forecaster (RCGA and SOGA-FCM) based on scores for the EB method (Athens).



**Table A4.** Case (A)-Calculated errors and weights for each ensemble forecaster based on scores for the EB method (Thessaloniki).



**Table A6.** t-Test: Paired Two Sample for Means between the ensemble methods (AVG and EB) (Athens).




**Table A8.** t-Test: Paired Two Sample for Means between the ensemble methods (AVG and EB) (Larissa).

