Found pics! Claims of 30" in Contoocook/Hopkinton.
https://books.google.com/books?id=vQHOGE7swgoC&printsec=frontcover&dq=inauthor:"Hopkinton+Historical+Society"&hl=en&sa=X&ved=0ahUKEwjr7e3kz7TXAhWF1IMKHc5IDm0Q6AEIJTAA#v=onepage&q=Snow&f=false
Was he letting it fall into the can though? That usually greatly underreports w.e...especially if the snow was all stuck around the side of the gauge too.
I do like Tip's blue snow mentioned in the comments.
What do you have on mid-April 1933? Is this a weenie measurement?
http://www1.ncdc.noaa.gov/pub/orders/IPS/IPS-8A0AFA92-B375-4468-9ACD-4EE35C2EB4E4.pdf