Different SNOWFALLM number between API and WU website for same town 02482

I am trying to get the total snowfall amount for a particular city on a historical date. The result for snowfallm (and snowfalli) for this city is 0.00, however it should be 2.20. If I look at that date on WU main site for that zip code, I do get the correct number. Also, if I look at a neighboring town, I get the correct snowfallm. Why would the api not give the right number, but the website give the correct value?

Date in question is 12/29/2012. Zip is 02482 (history_20121229/q/zmw:02482.1.99999.xml). Compare to Boston snowfall which is correct