We had a jurrasic 737 with fuel indication over read, which is a symptom of water in the fuel and iced lower wing skins & limited downtime. Cycling the flaps/slats & spoilers & flying controls with the engines running & elec pumps on dumps heat into the fuel through the heat exchangers, and was enough to warm up the fuel and melt the ice & enable a good water drain, I am sure the temp was positive though.
Have operated in Scandinavia with temps 15 below or more for months and the only way we could do it was to wait for a hangar input.
Boeing Maint Planning Data section 6 systems includes wording not unlike this:
Fuel tank sumping task intervals should be determined by operators and based upon their operating environment, fuel management resources and in-service experience.
Would be worth checking the Airbus document.