January 20 forecasted for -2.

Then it warms up, but then it will get cold again, right now forecasted to be 5 on the 25th and 0 on the 26th.

If players are lucky, the cold spell will intensify and slight move up in date, and the low will be in the negatives. That would take it to 10x. That would basically bring the house edge down 1%, BUT that's considering redeeming RCs at full value, which can only be used or on-property expenditures in such a way (freeplay is half value).