## 3 Experimental Data
### Design Day Correction in the UHI Zone  
According to the modified hourly dry bulb temperature \(t_{sh}\) and the urban heat island intensity \(I_{UHI}\) of the corresponding region, the hourly dry bulb temperature \(t_{sh-UHI}\) under the influence of the urban heat island effect is calculated as the design day in the region. Meanwhile, the hourly variation coefficient \(\beta_{UHI}\) of dry bulb temperature under the influence of the urban heat island effect in this region is calculated according to the formula, which is taken as the \(\beta\) of this region, as shown in Tables 14 and 15. Comparing the modified design days and regional design days under the UHI effect with the design days formed by \(\beta\) in the original specification, the results are shown in Figure 12.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**Hour** & **1** & **2** & **3** & **4** & **5** & **6** \\ \({}^{\circ}\)C & 30.20 & 30.01 & 29.89 & 29.81 & 29.79 & 29.92 \\ \hline
**Hour** & **7** & **8** & **9** & **10** & **11** & **12** \\ \({}^{\circ}\)C & 30.27 & 30.93 & 31.97 & 33.42 & 35.11 & 36.83 \\ \hline
**Hour** & **13** & **14** & **15** & **16** & **17** & **18** \\ \({}^{\circ}\)C & 38.36 & 39.50 & 39.98 & 39.76 & 38.88 & 37.55 \\ \hline
**Hour** & **19** & **20** & **21** & **22** & **23** & **24** \\ \({}^{\circ}\)C & 35.99 & 34.37 & 32.99 & 31.90 & 31.09 & 30.49 \\ \hline \end{tabular}
\end{table}
Table 13: Shanghai district design day.  
Figure 11: Comparison between Beijing (**a**) and Shanghai (**b**) design day and real value.  
As can be seen from Figures 3-11, the full-day maximum temperature in Beijing in summer is one hour later than the norm and appears at 15:00, with a temperature rise of about 3 \({}^{\circ}\)C. It is expected to remain at 15:00 in the future, with the temperature roughly the same as the normal value. The temperature in Chaoyang District increases significantly from 15:00 to 7:00 in the morning of the next day, and the temperature from 8:00 to 14:00 is roughly the same as that in Beijing. The maximum temperature in summer in Shanghai was delayed 1 h later than the norm and appeared at 15:00, with a temperature rise of about 4 \({}^{\circ}\)C. In the future, it is expected to be delayed 1 h to 16:00, with a temperature rise of about 6 \({}^{\circ}\)C on the basis of the normal value. The temperature in Jiading District of Shanghai increases from 17:00 to 6:00 in the morning of the next day, and the temperature from 7:00 to 16:00 is roughly the same as that in Shanghai.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Hour** & **1** & **2** & **3** & **4** & **5** & **6** \\
**Chaoyang** \(\beta_{\text{UH}}\) & \(-0.33\) & \(-0.41\) & \(-0.45\) & \(-0.46\) & \(-0.44\) & \(-0.42\) \\ \hline
**Hour** & **7** & **8** & **9** & **10** & **11** & **12** \\
**Chaoyang** \(\beta_{\text{UH}}\) & \(-0.42\) & \(-0.36\) & \(-0.22\) & \(0.02\) & \(0.26\) & \(0.53\) \\ \hline
**Hour** & **13** & **14** & **15** & **16** & **17** & **18** \\
**Chaoyang** \(\beta_{\text{UH}}\) & \(0.73\) & \(0.86\) & \(0.92\) & \(0.91\) & \(0.87\) & \(0.77\) \\ \hline
**Hour** & **19** & **20** & **21** & **22** & **23** & **24** \\
**Chaoyang** \(\beta_{\text{UH}}\) & \(0.70\) & \(0.62\) & \(0.49\) & \(0.35\) & \(0.19\) & \(0.08\) \\ \hline \hline \end{tabular}
\end{table}
Table 14: Hourly variation coefficient of dry bulb temperature in Chaoyang.  
Figure 12: Design day comparison in Beijing (**a**) and Shanghai (**b**).  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Hour** & **1** & **2** & **3** & **4** & **5** & **6** \\
**Jiading** \(\beta_{\text{UH}}\) & \(-0.06\) & \(-0.08\) & \(-0.09\) & \(-0.1\) & \(-0.11\) & \(-0.13\) \\ \hline
**Hour** & **7** & **8