What does it mean when a guy randomly texts you "So nice out" meaning about the weather? Why not ask how my day is going?

Anonymous
I've been seeing this guy for a few months and we talk on the phone most nights but he randomly texts me this morning saying "So nice out."

Is this his way of letting me know that he is thinking of me this morning? It just seemed so random to me and it was hard for me to think of what to say back when I responded. Guys why do you do this?
What does it mean when a guy randomly texts you "So nice out" meaning about the weather? Why not ask how my day is going?
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