There's no way to add temperature fields to the Ice Skating activity's layout.
To reproduce:
1. add Ice Skating activity to your ft965
2. go to Outdoor
3. ...
4. Ice Skating Settings
5. Data Screens
6. Chose the 1st layout (HR, Time, Active calories)
7. Data Fields
8. Chose Active calories
9. Up/Down
You'll see that the Temperature section is missing, and the Temperature/Max Temp for 24h/Mint temp for 24h fields are not even under Other section
