IceCyclesmodelled ice formation

This estimates whether ice has FORMED. It says nothing about ice QUALITY, bonding, or whether a route should be climbed.

Modelled from weather data. Not an observation of ice, and not advice.

Granville Gulf, VT

The model estimates whether ice has formed. Ice quality and bonding are not observable from weather data and are not modelled. How the model works.

3 routes across 1 area, every one with a confirmed position.

Sign in to follow Granville Gulf

Cold so far

00 freezing degree-days (°C°F) since 1 October

No day has averaged below freezing yet. 11 of the last 15 seasons had banked some cold by this date.

2011–12: 0 degree-days °C'112012–13: 5 degree-days °C2013–14: 3 degree-days °C'132014–15: 0 degree-days °C2015–16: 2 degree-days °C'152016–17: 1 degree-days °C2017–18: 4 degree-days °C'172018–19: 2 degree-days °C2019–20: 9 degree-days °C'192020–21: 5 degree-days °C2021–22: 0 degree-days °C'212022–23: 0 degree-days °C2023–24: 4 degree-days °C'232024–25: 0 degree-days °C2025–26: 0 degree-days °C'252026–27: 0 degree-days °C2026–27median of previous 15: 2 degree-days °C
2011–12: 1 degree-days °F'112012–13: 9 degree-days °F2013–14: 5 degree-days °F'132014–15: 0 degree-days °F2015–16: 3 degree-days °F'152016–17: 1 degree-days °F2017–18: 7 degree-days °F'172018–19: 4 degree-days °F2019–20: 17 degree-days °F'192020–21: 9 degree-days °F2021–22: 0 degree-days °F'212022–23: 0 degree-days °F2023–24: 8 degree-days °F'232024–25: 0 degree-days °F2025–26: 0 degree-days °F'252026–27: 0 degree-days °F2026–27median of previous 15: 3 degree-days °F

Each day that averages below 0 °C adds how far below: a day averaging −5 °C adds 5.Each day that averages below 32 °F adds how far below: a day averaging 23 °F adds 9. Warm days are not subtracted, so a thaw that strips ice does not show here. Modelled at the climbs' typical elevation, not measured on them. It is not a prediction: early cold on its own has not predicted when ice arrives in the seasons this project has records for. Every season is measured over the same window, 1 October – 10 November.

Autumn recharge

215 mm since 1 September

Wetter than 3 of the last 15 autumns to this date, drier than 12.

2011: 267 mm'112012: 235 mm2013: 201 mm'132014: 202 mm2015: 272 mm'152016: 256 mm2017: 293 mm'172018: 347 mm2019: 343 mm'192020: 220 mm2021: 283 mm'212022: 239 mm2023: 223 mm'232024: 146 mm2025: 245 mm'252026: 215 mm2026median of previous 15: 245 mm

Seep-fed rock needs water in it before cold can do anything, so this is one of the two things a season needs. It is not a prediction: the other is sustained cold, which nothing here forecasts, and autumn rainfall on its own has not predicted when ice arrives in the seasons this project has records for. Every year is measured over the same window, 1 September – 10 November.

Access is yours to check

This site says nothing about whether you may reach or climb these routes. That is decided by whoever manages the land — a park, a forest, a city, a tribe, a private owner — and by permits, seasonal and wildlife closures and local law, all of which change. A route listed here is not a route you are allowed to climb, and a route with no restriction noted here may still be closed. Check with the land manager before you go.

Guidebook

An Ice Climber's Guide to Northern New England by Rick Wilcox and S. Peter Lewis

Route positions are in the guidebook and not on this site. The author walked the terrain and verified the lines; that work is theirs to sell.

Sign in to tell us something here is wrong. Corrections are attached to an account so we can ask a follow-up question.