CFI URGES HER STUDENT TO REQUEST A SPECIAL VFR CLRNC TO LAND AT CCR.

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I SIGNED MY STUDENT OFF ON HIS FIRST SOLO XCOUNTRY TO UKIAH; CA. THE WX WAS ABOVE VFR AND FORECAST TO BE ABOVE VFR FOR HIS ENTIRE FLT. HOWEVER; ON FINAL PHASE TO LNDG HERE AT CCR; HE WAS ADVISED BY THE TWR THAT THE ARPT HAD JUST GONE IFR DUE TO VISIBILITY FALLING TO 2 MI IN HAZE. THE TWR THEN GAVE HIM THE NEW ATIS INFO AND ASKED HIM TO STATE HIS INTENTIONS. AT THE SAME TIME; I WAS IN ANOTHER AIRPLANE WITH ANOTHER STUDENT AND HEARD THE CONVERSATION BTWN HIM AND THE TWR. I IMMEDIATELY JUMPED ON THE FREQ AND INSTRUCTED THE TWR THAT HE WAS A STUDENT PLT AND THAT HE NEEDED A 'SPECIAL VFR' CLRNC. THE TWR THEN; ONCE AGAIN; ASKED HIM TO STATE HIS INTENTIONS. HE HAD OBVIOUSLY HEARD MY XMISSION AND PROCEEDED TO REQUEST A SPECIAL VFR INTO CCR. THE TWR GAVE HIM THE CLRNC AND HE LANDED WITHOUT ANY FURTHER PROBS. I REALIZE THAT INSTRUCTING MY STUDENT TO LAND WITH A SPECIAL VFR CLRNC WAS IN VIOLATION WITH FAR 61.89 (A)(6); SPECIFYING AT LEAST 3 MI VISIBILITY FOR STUDENT PLTS. I MADE A DECISION THAT I FELT WAS IN MY STUDENT'S BEST INTEREST UNDER THE CIRCUMSTANCES.