where is the "permanent" snowline in winte?

[brianpmcdonnell17]

Crater Lake in Oregon has an average July high temperature of 69 degrees yet retains at least an inch of snow cover into the month most years.
https://www.nps.gov/crla/planyourvisit/weather.htm

[Nichle]

Originally Posted by brianpmcdonnell17

Crater Lake in Oregon has an average July high temperature of 69 degrees yet retains at least an inch of snow cover into the month most years.
https://www.nps.gov/crla/planyourvisit/weather.htm

It also has a record high of 95F in June - it's quite possible there was still some snow on the ground when it reached that temperature, which seems likely to be a world record. If not exactly then, there was probably at least one other 90F+ day in June with snow on the ground. (The record high for May is 80F, in which I assume a snowpack is almost guaranteed).

Upon further inspection, it seems pretty unlikely to be a place in the Rockies, they don't get as much snowfall as the Cascades, and are about the same for record heat.

[Ed's Mountain]

This graphic is from @newfangl3d on Twitter. It shows the big difference in snow duration between Edmonton and Calgary.

Edmonton typically sees more than 120 consecutive days of snow cover a year. Calgary is much more variable and usually the longest duration is around 30-70 days. Having lived in both places I can say for sure Edmonton qualifies as "permanent snowline" territory whereas Calgary does not.


Source: https://twitter.com/newfangl3d

[Isleofpalms85]

Indianapolis definitely doesn’t have a persistent snowpack most winters and Indy averages around -2 C for a mean during the coldest month which is January, being a resident here for over 20 years I can assure you many if not most winter seasons feature a mix of green winter days(during that mid winter thaw) and white winter days.