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It started out at about -2 C (28 F) and dropped to about -7 C (19 F) by the late evening and that was about the limit fro most. But there were some overhead heaters in that pavilion which helped. We've had many jams at some pretty cold temps: 0C/32F. But having bonfire nearby helps.
Thanks for the info. I will keep that in mind if we ever decide to have some colder weather jams. Can't wait until April/May so that we can do some regular outdoor, physically distanced jams again here.