Black Opal Wine

I serve this at a dinner, is it to be served at room temperature or chilled?

Depends. Is it a white or red?
The whites are usually served chilled.
Red, not to "room temperature", but a cellar temperature, generally around 55 º F. You can place the bottle of red wine in a refrigerator for 1 / 2 hour before serving.

the temperature of the grocery store it was purchased in

Who would not want any notes on the presentation of wine shop