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I wasn't actually doing astronomy, but I went to Saskatoon in Canada around December several years ago, actually working for Telstra, and it was -28C. The locals said it was a good thing I didn't come last week as it was cold...-40C. I would hate to be outside at night....that was the daytime temperature! I think even the photons would freeze and drop to the ground!
I am a bit of a wimp, anything below about +5C and the electric blanket is too tempting....
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