Tell me what the weather has been like these days

The weather has been warm these days. I think it was very cold in this winter
but from last week it has started to become warmer.
The weather is like spring weather. (You could also say The weather is like spring or The weather has been like srping.)
Sometimes it has been windy, but not cold
It's a good weather go toto go outside
I want to go on a picnic to the park with my friend

잘했다!

피크닉 당신은 가(김밥)! 맛있다 ^^  

Tell me what the weather has been like these days

The weather has been warm these days. I think it was very cold in this winter
but from last week it started to warm up.
The weather is like spring weather. (ok)
Sometimes it has is windy but not cold.
It's a good weather to go to outside. (I dont like this. The weather outside is good to go out in).
I want to go picnic to at the park with my friend. (You can say: I want to go on a picnic... or you can say I want to picnic... the former is a noun and the latter is a verb).

You have no idea how cold it is here. During the day the temperature may rise to roughly 14 F (-10 C) but at night it has been getting down to as low -4 F (-20). It is absolutely abnormal. The wind on top this makes it feel even colder. I am from Great Lakes Region of the US (New York) so this happens once every couple years.

I have this interesting theory. I find that the weather in Korea is an exact opposite to New York (NY). Since Korea is nearly the exact opposite side of the earth to NY, the artic air mass shifts back and forth over the north pole. So, when warm air pushes up from the south in Korea, it pushes the artic air mass down on the US Northeast and vise versa.

I remember flying to Korea in Decemeber a year ago and when I left from NYC it was 50 F, but my I arrived in Seoul it was numbingly cold, about 18 F. I left Korea in January and the temperature was warming up and I would return to fridged temperatures in NY. I never escaped the cold! lol.