FLC OF AN MDT TURBOPROP LANDED BELOW WX MINIMUM DUE TO NOT HAVING INFO IN A CURRENT NOTAM.

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DISPATCHED FROM ORD TO CMI WITH ALTERNATE OF EVV. ENRTE TO CMI; WX DROPPED BELOW APCH MINIMUMS. ENTERED HOLD AT LOM AT CMI AND CONTACTED DISPATCH BY RADIO. DISPATCH HAD US HOLD FOR 30 MINS TO SEE IF WX WOULD IMPROVE; THEN DECIDED TO SEND US TO SPI. DISPATCH RERELEASED TO SPI WITH EVV AS ALTERNATE. NEW FUEL FIGURES WITH CURRENT AND FORECAST WX FOR SPI GIVEN. SPI WAS CURRENTLY 200 FT OVCST; 3/4 MI VISIBILITY. LEFT HOLD AND PROCEEDED TOWARD SPI AND OBTAINED ATIS INFO OF CURRENTLY 200 FT OVCST; 1/2 MI FOG. BEING TURNED OVER TO SPI APCH; WE WERE GIVEN HOLDING INSTRUCTION OVER THE VOR AND EXPECT FURTHER CLRNC TIME IN 30 MINS. WE ASKED REASON FOR THE HOLD AND CTLR EITHER SAID 'VISIBILITY IS 1/2 MI' OR 'VISIBILITY BELOW LNDG MINIMUMS.' MY FO AND I DISCUSSED THE INFO AND APCH PLATE WHICH SHOWED 1/2 MI NEEDED FOR THE APCH UNLESS THE ARPT LIGHTING SYS WAS OUT; WHICH WAS NOT MENTIONED ON ATIS BROADCAST. I SAID TO CTLR THAT OUR APCH PLATES INDICATE WE ONLY NEED 1/2 MI; TO WHICH HE REPLIED 'STATE YOUR INTENTIONS.' WE ASKED TO SHOOT THE APCH AND WERE GIVEN VECTORS TO JOIN THE ILS. NORMAL APCH AND LNDG MADE. DISCUSSING INCIDENT WITH ANOTHER COMPANY PLT AT SPI; DISCOVERED THAT THERE WAS AN FDC NOTAM INCREASING MINIMUM VISIBILITY TO 3/4 MI FOR ALL CATEGORIES. CONTRIBUTING FACTORS: DISPATCH WHILE INFLT TO SPI WITH NO PRINTED WX PACKET WHICH INCLUDES NOTAMS. ASSUMED DISPATCHER WOULD ADVISE OF ANY PERTINENT NOTAMS. OF COURSE; ATIS BROADCASTS DO NOT INCLUDE FDC NOTAMS THAT CONTAIN CHANGES TO APCH MINIMUMS. WHY DID THE CTLR NOT ADVISE OF THE FDC NOTAM WHEN WE INQUIRED ABOUT APCH PLATE SHOWING THE 1/2 MI VISIBILITY REQUIRED FOR THE APCH. IN FUTURE IF DISPATCHED TO ARPT FOR WHICH I DO NOT HAVE THE WRITTEN WX (AND NOTAM) PACKET; WILL SPECIFICALLY ASK FOR ALL NOTAMS TO BE READ TO ME.