Wednesday, March 26, 2014

Late Snow

Every year when a late-season snowfall blankets some portion of the nation, many wonder exactly how unusual it is. In short, the answer is that late season snows are the norm, not the exception. The three maps below show 1) the average date of the latest measurable snow, 2) the latest date on record with a measurable snow, and 3) the greatest snow amount after April 1st.

Figure 1. Average date for the latest measurable snowfall in a season. Seasons with 15+ years of data that receive measurable snow in a majority of years were used.

Figure 2. The latest ever date with measurable snow. Seasons with 15+ years of data that receive measurable snow in a majority of years were used.

 
Figure 3. The largest calendar-day snow total for any day between April 1 and May 31. All stations with snow records were used.


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