I would not worry about it either at this point.

If it ends up tasting thin, you could freeze a gallon solid and then
let it thaw over a funnel; then add the runnoff back and throw out the
ice chunk when it looks like it's mostly water.

It about 0 F here in Pittburgh, so I'm not feeling your pain either.
It only sounds warmer... )

Regards,
Joe

>
> Hi Andy:
> I wouldn't worry--the difference 1 litre in 23 makes is a little
> over 4%.

>
> >....up in the frozen north(new brunswick,canada).....its been-25C
> > for the last 7 days YIKES.........
>
> I sympathise, but not much. I live in Alberta. That's mild
> winter weather around here. (Though lately we've been having
> something springlike--6-10 for the last week. It won't last.)