A PART 135 ACFT CONTINUED A FLT INTO ICING CONDITIONS; AND EXPERIENCED RELATED PITOT-STATIC FAILURES; AND HVY ICE ACCUMULATION; RESULTING IN A DIVERSION.

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ON THE PARTICULAR DAY IN QUESTION; I HAD SCHEDULED A FLT FROM DPA TO MWC AND IMMEDIATELY BACK TO DPA. IN MY USUAL ANTICIPATION OF A FLT. I CONSULTED DUATS AS WELL AS A FLT BRIEFER; FOR WX. THE CEILING WAS MEASURED 2400 FT OVCST; AND 40 DEGS FAHRENHEIT. THE CLOUD LAYER WAS RPTED TO BE 2000 FT THICK WITH WARM; CLR AIR; ABOVE. THE WX BELOW THE CLOUDS WAS BUMPY; WITH ONLY 10 MI VISIBILITY. FOR MY PAX SAKE; AS WELL AS THE ADDED SAFETY OF AN IFR FLT; I ELECTED TO FLY ABOVE THE CLOUDS. THE FLT UP; WENT WITHOUT A HITCH; WITHOUT ANY SIGN OF ICE. AFTER LNDG AT MWC; I THOUGHT IT WOULD BE WISE TO GET AN UPDATED BRIEFING. THE BRIEFER SAID THAT THERE WERE NO RPTS OF ICING. I KNEW THIS BECAUSE I HAD JUST FLOWN IN; AND THE WX HAD NOT SIGNIFICANTLY CHANGED. I FILED FOR 6000 FT; AND RECEIVED 4000 FT; WITH EXPECTATIONS OF 6000 FT; IN 10 MIN. WHEN I LEVELED OFF AT 4000 FT; I IMMEDIATELY BEGAN TO PICK UP ICE. SHORTLY; THEREAFTER; I EXPERIENCED A LOSS OF MY STATIC INSTS; AS WELL AS MY AIRSPD INDICATOR. ICE HAD ACCUMULATED TO; CLOSE; TO; AN INCH. I TOOK THE STEPS NECESSARY TO ALLEVIATE MY INST PROBS. I MADE REPEATED REQUESTS FOR DIFFERENT ALTS. THE CTLR AND I; CAME TO A CONCLUSION THAT HE WOULD HELP ME BACK TO MKE. I WAS VECTORED FOR THE APCH; AND MADE AN UNEVENTFUL LNDG. I LEARNED THAT THE WX RPTED IS NOT ALWAYS ACCURATE. I LEARNED THAT IF ONE IS NOT HAPPY WITH A CTLR'S INSTS; THEN QUERY THAT CTLR.