It's a sunny day☆

(*) you could add "season", grammatically it's still correct. But it sounds more naturally to leave it out. You would add it if you said: "Christmas season" or "planting season" or something like that. Winter is a season automatically.
You can put in "now" where I put it, in the very front of the sentence, or in front of winter, the stress on "now" (as opposed to other times) is stronger the further in the front the word is put. You could also leave it out altogether.

(**) The word order you chose is not wrong as such, but to stress that today is different from other days, put it further to the front.

(***) "to spend" needs an addition (object) indicating what you spent. Assuming that you want to say that you felt well during the day, I would formulate like above. It would also be possible to say something like: "So I was able to spend my money comfortably." Meaning it was easy to spend money. (Maybe because it was more comfortable to go out on the street.) or "I was able to spend my money in comfort." Meaning that you felt good while spending the money. - a very subtle difference.
Just as a cultural bit: British people would probably formulate the thought altogether differently, stressing the negative (they like to stress how bad the weather is, whatever it is). They'd probably rather say: "But it was sunny and warm today, so for once I wasn't freezing." or something to that effect.

But despite all my comments: Well done! I understood perfectly what you said!