At this point, the models are all over the place, so the weather forecast is very iffy for Wisconsin - it could be anywhere from relatively mild (for WI) and dry or it could be cool and showery. Will have to wait awhile before knowing on this one. Average high/low for 10/31 is 52-34 and best guess now is temps will be not too far from that (30s on Sat morning and low 50s for a high temp); it's the chance of showers that is really hard to predict from this far away. The NWS discussion reflects the uncertainty well:
FRIDAY AND SATURDAY...FORECAST CONFIDENCE...MEDIUM
GFS AND ECMWF (Euro model) BOTH HAVE HIGH PRESSURE AND BELOW NORMAL TEMPS FOR
FRIDAY. THE ECMWF HOLDS ONTO THE HIGH FOR SATURDAY...WHILE THE GFS
BRINGS A SHORTWAVE AND RAIN CHANCES INTO THE AREA. SIZABLE SPREAD
IN TEMPS FOR SATURDAY GIVEN THE DIFFERENT SOLUTIONS...WITH THE GFS
MAINTAINING BELOW NORMAL TEMPS...WHILE THE ECMWF WARMS BACK TO
AROUND NORMAL. STUCK CLOSE TO THE CONSENSUS BLEND OF MODELS FOR
NOW.
FRIDAY AND SATURDAY...FORECAST CONFIDENCE...MEDIUM
GFS AND ECMWF (Euro model) BOTH HAVE HIGH PRESSURE AND BELOW NORMAL TEMPS FOR
FRIDAY. THE ECMWF HOLDS ONTO THE HIGH FOR SATURDAY...WHILE THE GFS
BRINGS A SHORTWAVE AND RAIN CHANCES INTO THE AREA. SIZABLE SPREAD
IN TEMPS FOR SATURDAY GIVEN THE DIFFERENT SOLUTIONS...WITH THE GFS
MAINTAINING BELOW NORMAL TEMPS...WHILE THE ECMWF WARMS BACK TO
AROUND NORMAL. STUCK CLOSE TO THE CONSENSUS BLEND OF MODELS FOR
NOW.