When making a statement or declaration of this sort, it would be expected that you follow up with some details, otherwise it seems a little bit of a pointless comment.
"..I really miss skiing and throwing snowballs."
このような発言をするときは、あなたがそう思う理由を説明すると良いと思います。例えば―
I really miss skiing and throwing snowballs.（スキーや雪合戦したいなぁ。）
The sentences are all good to use although a couple of words to explain why might be good to add as otherwise it doesnt really explain why you miss it
so you could say "it is too hot in the summer so I am missing the cold winter weather" or "I am missing the snow when it is summer time"
これらの文はすべて使えますが、なぜ冬が恋しいのかについて説明されていないので、少し言葉を補ってもいいかもしれません。例えば：
【例文】
"It is too hot in the summer so I am missing the cold winter weather"
（夏は暑すぎるので寒い冬が恋しいです）
"I am missing the snow when it is summer time"
（夏の時期は雪が恋しいです）
"I start to miss winter when summer comes around. "
comes around - reappear; return, happen
When summer returns, you start to miss winter. Perhaps it is because of the hot weather.
"In the summer, I find myself missing winter. "
find - realize, notice
In the summer you notice that you miss winter.
"I miss the cold (winter) in the summertime. "
You can say this if you believe it's too hot in the summer and prefer the cold temperatures of the winter.
"I start to miss winter when summer comes around."
（夏が来ると、冬が恋しくなります。）
comes around - 再び現れる、戻ってくる、起こる
夏が来ると、冬が恋しくなる。暑さのせいかもしれませんね。
---------
"In the summer, I find myself missing winter."
（夏が来ると、冬が恋しくなります。）
find - 認識する、気づく
夏になると、冬が恋しいのに気づく。
---------
"I miss the cold (winter) in the summertime."
（夏が来ると、寒いのが（寒い冬が）恋しくなります。）
夏は暑すぎて冬の寒い気候の方が好き、ということなら、このように言えます。
It is important to note that the names of the seasons - Winter, Summer, Autumn (Fall) and Spring are all proper nouns and need to have a capital letter.
There are a number of ways to express that you miss Winter in Summer. You can point to the Winter weather - cold, snow, icy, rainy. You could also say that you don't like the warm weather.
When we have entered a season - i.e. Summer - We say we are 'in' that season. When explaining this we can say 'during' the Summer.
Make A B AにBさせるの表現を使い
「熱い夏は私に冬を恋しくさせる」という日本文をもとに英語を作ってみます。
pine for～「～が恋しくなる」
The hot summer makes me pine for winter.
直訳「熱い夏は私に冬を恋しくさせる」
意訳「熱い夏になると冬が恋しくなる」
ご参考までに
アメリカ合衆国 
日本 
イギリス 
オーストラリア 
