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Average record low officially is about -8°C (18°F), average record min high about -4°C (25°F).
As for my personal weather station which has data going back to 2006:
Average lowest record low: -9.8°C (Period 2006-2015)
Lowest record low: -15.2°C (2012)
Highest record low: -5.2°C (2015)
High
27°F/-3°C (1887-2017)
28°F/-2°C (1981-2010)
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