Native English speakers, could you please help me with these issues?

1. When speaking of the weather, how do you express +12º C in speech? a) For instance, is it correct to say: "The average winter temperature in Seoul is "plus 12 degrees centigrade". b) Still considering the previous sentence, do English speakers ever say: "it's 12 degrees above... show more 1. When speaking of the weather, how do you express +12º C in speech?


a) For instance, is it correct to say:

"The average winter temperature in Seoul is "plus 12 degrees centigrade".


b) Still considering the previous sentence, do English speakers ever say:

"it's 12 degrees above zero".


c) And do they ever say:

"It's 12 degrees positive"

(Note: 'Positive' is the general term - in some languages - to refer to figures above zero.)



2. Is this sentence correct:

"That looks like a good way to welcome THE ARRIVAL of Summer."
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