Snow Depth Days
of the Northeast: 2024-2025

The season in review

Welcome to the new snow season. Except for a pathetic trace on Oct 28, the season began with a strongly elevation dependent storm on Nov 28, Thanksgiving. I hadn't had a chance to get snow tires on, but made it to a friend's house and back without incident. The tires claim to be all-season, maybe in Florida, not in NH! While I had a few inches, higher parts of Sutton got twice that or more.

December had several events, but less than a foot overall. The peak snow depth was 7.5", but bouts of rain and big temperature swings left me with very patchy snow.

January continued the theme, five of seven events were for less that 1". The storm track has been pushed south, and record snowfalls in Florida would have challenged thoise all-season tires! Instead of snow, the cold has been remarkable with only one day between the 20th and 25th seeing an above zero low, and that was was only +4°F.

February was somewhat warmer, with four days above freezing and one of those reached 50.8°F. However, all nights went below freezing and the highest dew point was only 34.4° so we had very little melting. We did have some better snow, but the biggest was only 7.1" - smaller than what Pensacola FL got in their January storm!

March was very quiet with only three minor events and I was down to a trace by mid month. The biggest event, 2.6", over a week later brought a couple of mornings with measurable cover. Ultimately, Dec, Feb, and Mar had second highest SDDs for those months and that led to the second highest SDDs for the season.

April brought a couple events, but melted quickly. I got no SDDs from them. Bow and Pepperell got more snow and got their last few SDDs for the season. Probably - we can get snow in May.

Daily/Monthly Data

The following table summarizes the snow fall and depth days from sites that are posting that data on local weather observations mail lists and a couple others. If people also prepare Web pages for daily information for their site, I'll include links to them. Cells under the "snow" column are the snowfall for the site in that month, under "SDD" are the depth days for the month.

Location October November December January February March April May
Snow SDD Snow SDD Snow SDD Snow SDD Snow SDD Snow SDD Snow SDD Snow SDD
Fairhaven MA 0.7 3 2 7 10.3 24
Pepperell MA 5.6 13 14.9 62 21.2 274 0 44 3.8 3
Bow NH 0.4 0 10.9 51.5 13.3 63 24.9 394 0.8 166 5.1 4
Bristol NH 6.2 11 11 171.5 10.7 63.5 30.2 384 8.4 156.4 4.8 0.6
Sutton Mills NH 3.2 6.5 10.8 121 9.7 57.5 26.6 301 3.8 134 3.7 0
Woodford VT 20.5 41 34.8 434 47.8 573 39 878 5.8 610 14.8 55

2024-2025 season to end of last month

The persistence quotient is lower than the ultimate value if there is still snow on the ground at the site. This data will be updated each month.

Location Snowfall Depth Days Persistence
Quotient
Fairhaven MA 13 34 2.6
Pepperell MA 45.5 396 8.7
Bow NH 55.4 678.5 12.2
Bristol NH 71.3 787 11.0
Sutton Mills NH 57.8 620 10.7
Woodford VT 162.5 2591 15.9

Contributors

The CoCoRaHS column is the "station number" registered at Community Collaborative Rain, Hail & Snow Network, an organization founded to create a much denser network of precipitation data than the National Weather Service entities can provide. One of these years I might look into downloading CoCoRaHS data each month and add that data here.

Name Location CoCoRaHS
Dennis Bollea Fairhaven MA  
Steve Gunn Bristol NH NH-GR-1
Todd Gross Woodford VT  
Jim Hilt Bow NH NH-MR-4
Paul Venditti Pepperell MA  
Ric Werme Sutton Mills NH NH-MR-63

Credits

Jim Corbin, a meteorologist from Rhode Island, proposed the concept of both snow depth days and the persistence quotient, but he didn't have good names for them.  After a bouncing around various ideas, I came up with Depth Days.  It seems to fit into colloquial speech well, e.g. "When mired in the Depth Days of February, she thought fondly of the Dog Days of August." Of course, none of us snow lovers would ever think that. I picked Persistence Quotient while putting this page together, we'll see how it wears with time.

Musings

I think depth days is a great statistic, and I'm surprised that it is catching on slowly outside of the NE Weather Spotters mail list. I never expected that the NWS would embrace it quickly, but I had hoped that TV meteorologists would start using it, in monthly summaries, if nothing else. It would be nice if ski areas would use it, but they may not wish to if they are not likely to be #1 consistently. (And if only one area reports depth days, it would not be a good comparative statistic.)

Last update: 2025 May 10
Ric Werme

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