Snow star crystal 1.5mm diameter grown on an electric needle: Photo Ken Libbrecht. Snow covered Stevenson screen.

Llansadwrn (Anglesey) Weather:
Snowdonia Snowline Report

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Logo: Llansadwrn Weather - Melin Llynnon, Ynys Môn.

Snowdonia Mountains Winter Season 2019- 20

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Current snowline histogram. Snowline histogram

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Snow on summits of the Snowdon Horseshoe on 4 January 2010.




Snow on the NW flank of Snowdon.The first snow was seen on Snowdon on the 26th after the cloud lifted late in the afternoon. The same date as last year (2018). On the 27th light snow was lying at 0900 GMT on the Carneddau and Snowdon at an average 2850 ft. Snow persisted on Snowdon on the 28th/ 29th with icy deposits remaining on the 30th




A little snow was seen around Yr Wyddfa on the 2nd with icy remnants on the 3rd. Some ice precipitation was seen on Carnedd Llewelyn on the 6th when Snowdon was enveloped in cloud. There was slight snow was on the Carneddau at 3100 ft on the morning of the 7th and fresh snow fell as low as 2000 ft during the evening. Fresh snow was falling on the Carneddau Mountains.On the 8th some snow was a low as 2500 ft on the northern slopes of the Carneddau and lying above 2850 ft there and on Snowdon. Fresh snow was falling and settling on Snowdon and the Carneddau Mountains on the morning of the 9th around 1000 ft (300 m) and as low as 850 ft in places.




Snowdonia snowline current histogram.


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  • Read about ice precipitation; snow and the different types of hail on this website  Snow and types of hail.
  • To find out more about snow and ice crystals

    visit Ken Libbrecht's website Link through to Ken Libbrecht's site
  • Before you go on the mountains checkout the Met Office forecast for Snowdonia for the National Park
  • Other Met Office British Mountain area forecasts
  • AWS weather stations and live webcams
  • Gorddinog, Llanfairfechan AWS
  • Gorwel Heights, Llanfairfechan AWS
  • Mynydd Llandegai AWS
  • and webcam Click for Carneddau webcam
  • The OGGI webcams Click for the OGGI webcam

  • Ogwen Valley Mountain Rescue Organisation.   Ogwen Valley Mountain Rescue Organisation OVMRO
  • Current weather at Llyn Ogwen.   Current weather AWS


  • Cairngorm summit weather station Intermittent operation Courtesy of Heriot-Watt University Physics Department
  • Information

  • You can view the snowline histograms for previous years here:

  • Winter 2018-2019. Winter 2018-2019
    Winter 2017-2018. Winter 2017-2018
    Winter 2016-2017. Winter 2016-2017
    Winter 2015-2016.  Winter 2015-2016

  • You can view complete snowline reports for previous years here:

  • Winter 2018-2019. Winter 2018-2019
    Winter 2017-2018. Winter 2017-2018
    Winter 2016-2017. Winter 2016-2017
    Winter 2015-2016. Winter 2015-2016

  • For earlier archived reports refer to the Site Map.



    Observations are made as near to 0900 GMT as possible. I have a good view from Llansadwrn, weather permitting, across the Menai Strait towards the Snowdonia Mountains. I can see the northern slopes of the mountain range from Moel Eilio (west of Snowdon), Snowdon summits (Yr Wyddfa and Crib Goch), the Glyderau and Carneddau to Foel-fras and Drum to the east of the range near the Conwy Valley. With the aid of binoculars I make daily records that include any ice precipitation observed, the lowest altitude of snow lying at ( >= 50% cover), at ( >= 30% cover) and snow patches. I aim to update the diagram during the season at least twice weekly if there is any snow.

    Designed and written by Donald Perkins, Copyright © 1998 - 2019. All Rights Reserved.

    Page first published 29 September 2019 and will be updated during the season

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