September and October Snowfall Averages for Mt. Mansfield

As we head into the last few weeks of summer, some people’s thoughts turn to early snowfall in the mountains, and this topic recently popped up with respect to Mt. Mansfield in the New England Regional Forum at American Weather.  Since I have all the raw snowpack data from the Mt. Mansfield co-op station downloaded from when I created the Mt. Mansfield 24” snowpack plot, I scanned through the September numbers back to 1954 to see what they revealed.  Because the collection of actual snowfall at that station can be a bit dicey, I first checked the snowpack data that I had, and found three occurrences of September snowpack at the stake:

Date                 Snow at the stake (in.)
9/15/1959          1
9/16/1986          4
9/17/1986          2

However, assuming they have historically been using the same practice of reporting the depth of the snowpack at the end of the day (~5:00 P.M. or so) as they do now, it was likely that there was overnight September snowfall that simply didn’t make it through the entirety of many warm, September days to be reported from the stake.  Therefore, I also checked the snowfall data, and found that indeed there are a fair amount of reports of September snowfall:

Date                 Snowfall (in.)
9/15/1959          1.00
9/24/1966          0.50
9/2/1967            0.30
9/25/1967          1.50
9/22/1976          1.00
9/28/1980          0.50
9/16/1986          4.00
9/24/1989          1.00
9/21/1991          1.00
9/28/1991          0.30
9/29/1991          1.00
9/30/1992          0.30
9/23/1998          0.30
9/30/2009          0.02

There are a few years with no data, but accumulating September snow does happen on Mt. Mansfield, at a rate of roughly a couple times each decade.  I’m not quite sure what was going on with the 2009 number, since one doesn’t generally report snowfall to the hundredths of an inch; perhaps they are reporting a trace on that one.  Not surprisingly, September snowfall is more frequent on Mt. Washington with a couple thousand feet of extra vertical – the September monthly average there is 2.2” inches, and the monthly maximum is almost 8 inches, so accumulating September snow is probably fairly common.

I also scanned the Mt. Mansfield data for August, and there was even one report of accumulation there:

Date                 Snowfall (in.)
8/28/1986          0.20

Since there was also mention of October, I took a look at those data as well.  Because accumulating October snowfall is already fairly common even down here in the mountain valleys of the Northern Greens (out of the six season’s worth of snowfall data I have collected here, four Octobers have seen accumulating snowfall, and the average is right around an inch) I figured that getting October accumulation on Mt. Mansfield must be almost a lock.  Indeed that’s the case; after checking the snowpack data from 1954 – 2012, there are only a handful of seasons without reported snowpack, and one of those seasons did at least show some snowfall:

Seasons without reported October snowpack on Mt. Mansfield
1956-1957
1963-1964 – 0.1” snowfall
1971-1972
1973-1974
1985-1986
1996-1997
2007-2008

So essentially it’s about twice a decade that there is accumulating snow on Mt. Mansfield in September, and about once a decade that there isn’t accumulating snow on Mt. Mansfield in October.

Frost and Freeze alerts posted for Vermont

The frost and freeze warnings map from the National Weather Service Office in Burlington Vermont for September 16th, 2011
Freeze Warnings and Frost Advisories have been posted for the entire state of Vermont.

The National Weather Service office in Burlington has posted a freeze warning for our area, and indeed the entire state of Vermont is under either freeze warnings or frost advisories, so cover up vegetation as necessary. This may also be a good time to look into local furnace maintenance services as you want to be sure your current furnace can meet the demands of this cold weather. Companies like CJS Heating offer such services. Why now? Well, furnaces have to work much harder when the weather is colder and so some may struggle to keep up. The last thing you’d want is for it to stop working whilst temperatures are so low. Though the first frost for valley locations in the Central and Northern Green Mountains does typically happen in September, the average date for the occurrence is toward the end of the month (September 27th for Morrisville and September 30th for Montpelier) so this is a bit on the earlier side. Yesterday in the Northern New England thread at Americanwx.com, Powderfreak posted the chart from the National Weather Service that shows the average dates and ranges for first frost at some of our Vermont climate locations – mid September is in the 10th – 25th percentile. Take a look at that post for more information about average dates of 32 F temperatures around the state.

A map of predicted low temperatures for Vermont and New York from the Natioanl Weather Service in Burlington for September 17th, 2011
Low temperatures are going to be down in the 20s F in some locations overnight as the first frosts and freezes hit the North Country of Vermont and New York.

 

Bald Hill, VT 23JAN2010

An image of Ty skiing backcountry powder in the Bald Hill area near Camel's Hump
Ty out there ripping up some of the powder on Bald Hill today

Saturday was another potentially good day for some backcountry skiing in Northern/Central Vermont, since snowfall had again been rather minimal in the area during the preceding week.  At the house in Waterbury, we’d picked up just 1.4 inches of snow in the Sunday/Monday range from a storm that favored parts of Maine and Southern New Hampshire with up to a foot, and then 1.6 inches of snow in the Tuesday/Wednesday timeframe from an upper level low coming out of the Great Lakes.  As for the mountains, I saw accumulations topping out in the 4 to 5 inch range for the Bolton through Sugarbush stretch, with amounts tapering off to the north.  The forecast on Saturday called for a cold start in the 0 F range, but brilliant sunshine and eventual temperatures in the 20s F.  Weather wise, it was an excellent time to get outside.

“The combination of settling
and the thin breakable
crust in some spots made
things tricky at times,
but it was all soft and fun.”

With the snowfall thoughts in mind, the plan was to do some skiing off the west side of the Camel’s Hump/Mt. Ethan Allen area.  Unfortunately, on Friday we found out that Tom had tweaked his knee and ankle at soccer, so the ski group for the day was going to be just James, Ty, and myself.  We met up with James in Huntington Center a bit after 9:00 A.M., and decided on an initial plan of heading up the Forest City Trail to do some skiing on the lower flanks of Mt. Ethan Allen (3,674’), the next prominent peak south of Camel’s Hump.  We headed up Camel’s Hump Road, finding that the access to the Forest City trailhead was going to be difficult because the road there wasn’t plowed in the winter.  There was a little room along the snowbank to potentially park a couple of cars, but a more important factor in our case was the added distance to get to the trailhead.  Ty’s backcountry range is not that great yet, so we weren’t looking for a big approach.  There was the option to connect over to the Forest City Trail from the Burrows Trailhead area, but we decided to just do something simple off the Burrows Trail.  James had commented to me earlier that there was going to be a temperature inversion in effect, and that was indeed what we saw on our ascent of Camel’s Hump Road.  From down in Huntington Center (690’) where the temperature was somewhere in the middle single digits, the temperature was up around 10-11 F at the trailhead parking area (~1,900’).  The lot was about half full, and while we geared up, we could see that several parties of people were heading out for hikes on snowshoes.

An image of a stack of powder snow atop a stump along the Burrows Trail leading up to Camel's Hump in Vermont
Some of the powder stacked along the Burrows Trail

Starting up on the Burrows Trail, I checked the snowpack and found a couple inches of fluff on top of a generally thin crust, atop a lot more settled powder.  A few of the lower elevation stream crossings on the trail were open with small gaps, and that represented a bit of a challenge for Ty, but he managed well.  We didn’t have any lofty goals in mind other than getting in a little skiing, since our ultimate destination would likely be affected by Ty’s mood and stamina.  Our pace was pretty slow with Ty taking his time, but it was an easy go, and everyone’s skins were working well on the packed trail.  There were lots of dogs, lots of people on snowshoes (including a bigger group that seemed to be from the UVM Outing Club), and we also saw a party of about four skiers that passed us on their way up the trail.  One of the more interesting sights was a woman coming down trail at breakneck speed on a sled that looked like a booster seat.  We made sure to move out of her way, but she seemed to be very conscious of the uphill traffic and stopped easily.  James inquired about how her sled worked, and she demonstrated that for braking, you just lean back.  I know that people like to use those Mad River Rocket-style sleds on the trail and elsewhere, but this was the first time I’d seen what this woman had.

An image of Ty and James ascending Bald Hill on their skis near Camel's Hump in Vermont
Ty and James ascend Bald Hill.

Up to about the 2,300’ elevation mark the surrounding vegetation was on the brushy side, but above that point it began to thin out and the potential for skiable lines looked a little better.  Off to our right, we could see some open, moderate angle slopes across the big gully that had begun to parallel the trail, and off to the left we could see the more obvious lines that steepened on the way up to Bald Hill (3,041’).  Ty had some good bursts of skinning speed when we kept him motivated, but as inquiries about how far we were going and when we would get to ski became more frequent, we decided it was time to think about our descent route.  Heading off to the left for the lower slopes of Bald Hill was going to make things easiest for getting back to the trailhead for Ty, so a bit above 2,500’ when we hit one of the skin tracks breaking off the Burrows Trail and going in that direction, we took it.  The change of scene was enough to keep Ty motivated for a little bit longer, since we were able to tell him that we’d be able to descend soon.

We headed up into the glades a little farther, reaching an elevation of about 2,700’ before Ty seemed to be getting just a bit too antsy.  There were plenty of good lines available with untracked snow, but we could see that taking them would mean dropping right back down to the Burrows Trail almost immediately.  So, we continued to contour westward to get something that might drop a little more directly to the trailhead.  We could only traverse so far though, since Ty knew we were close to skiing and his inquiries started up again.  When we finally called it on the traverse, James and I skinned up a little farther to catch a nice looking line, while Ty waited just below us.

An image of Jay Telemark skiing in powder snow on Bald Hill near Camel's Hump in Vermont
Jay enjoys some turns in the beautiful powder out there on Bald Hill.

The skiing was good, and definitely worth the hike, but certainly not perfect or quite up to what I’d found off the Monroe Trail the previous weekend.  The combination of settling and the thin breakable crust in some spots made things tricky at times, but it was all soft and fun.  Ty stuck with just alpine turns, but had a lot of fun catching air and working on his jumping technique.  Our extra traversing had bought us a little longer descent, but we still dropped back to the Burrows Trail pretty quickly.  Instead of trying to ski on and near the trail, we took a traverse out to the west with the aim of eventually dropping back down to the parking lot to finish our run.  I used the GPS for route finding, and as is often the case, James went by his natural sense of direction.  The biggest issue with the traverse was that like on the Burrows Trail itself, a few streams were still open from the previous warm weather.  They weren’t too hard to cross since there were still snow bridges around, but Ty’s smaller skis definitely set him at a disadvantage for spanning some gaps.  We helped him across when needed.  Even with the aid of the GPS, I overshot the parking area by about 100 feet or so and had to swing back during my final descent, while James nailed it right on.

A Google Earth Image with GPS tracking data from a ski tour on Bald Hill near Camel's Hump in Vermont
The GPS tracking data from today’s ski tour plotted on Google Earth