Featured Question: Frequency of Dec. 2 Snow

Today's featured featured question arrives via email:

What is the frequency of snow falling on December 2 over the past 70 years [in Washington]?

Since 1940, there have been 8 instances of frozen precipitation reported at Washington National on Dec. 2, but only 2 of these were measurable. Only one was over 1" (1.8" in 1952, which is also the all-time record for the date going back to 1888). There was also 1" in 1936.