You'd hope it wasn't frozen.. Pretty hard to bring frozen brine to the surface. Brine's freezing point ranges down to -21 degrees at max. - depends on the salt content.
Looking at Anson's aquifers - the water is heated underground - surface temp doesn't matter.
edit: not sure if you were kidding or not. but thought I'd clear it up as that topic was raised a while back and address by management
