Yeah, that may happen at FROPA mix-out but I don’t think the steady precip will be sniffing 40F over the interior...esp that far north.
The high temp tomorrow is kind of a trivial statistic....take ORH for example, if it’s like 31-34F all day long and then it mixes out to 42F for an hour or two when the cold front hits, does that matter in terms of the sensible wx? No, not really.
If that 42F was happening for hours during the bulk of the precip, then it would be a big difference.