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I'll add that if the snow problem was easily rectified, then Doctor Strange wouldn't be wearing a winter coat like we see him sporting when Peter arrives. I'm speculating there's something off with the magical world, given that it's a winter wonderland in Sanctum Sanctorum. Of course, we're making assumptions here, as we don't know for sure that Wong suggested Strange was incapable of such a spell. Stephen Strange didn't get in the position he's in being an average sorcerer, so I can understand why Strange may have felt a bit disrespected by the admonishment.
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As mentioned, Wong ( who will also appear in Shang-Chi and the Legend of the Ten Rings) deliberately warned Doctor Strange in the Spider-Man: No Way Home trailer not to perform the spell, adding that it was "too dangerous." No disrespect to Wong, but let's remember who he's talking to.
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