The 10 Coldest Nights of 2018 [degs C]

10.  -0.6  February 16
  9.  -1.1  February 14

=7.  -1.3  March 19 & 20

  6.  -1.4  November 21
  5.  -2.4  February 6
  4.  -3.0  March 18
  3.  -3.1  February 27
  2.  -3.2  February 28
  1.  -4.5  March 1