〜にしては
for (a), considering
Noun / Plain form + にしては
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にしては says something is surprising given what you'd expect from a standard: 初めてにしては、上手ですね, "you're good, considering it's your first time".
The first part sets up an expectation (a first attempt, a ten-year-old, winter), and the second part goes against it, in either direction: better or worse than expected.
It follows a noun directly, or a plain verb form: 一生懸命勉強したにしては、点が悪かった, "for someone who studied so hard, the score was bad".
It's close to わりに, which works the same way but is more about proportion. Compare として ("as"), which gives a role, not an expectation.
Examples
初めてにしては、上手ですね。
You're good, considering it's your first time.
この店は駅前にしては静かだ。
This place is quiet, considering it's right by the station.
十歳にしては、しっかりしている。
They're very mature for a ten-year-old.
一生懸命勉強したにしては、点が悪かった。
For someone who studied so hard, the score was bad.
冬にしては暖かい日だ。
It's a warm day for winter.