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 2018- 19

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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.Wintry weather arrived on the 26th with showers of hail and snow around the summits, heaviest in the afternoon. On the 27th snow was lying thinly on the northern slopes of the Carneddau with icy deposits as low as 1800 ft in places. Slight snow lying above 3000 ft with ice at 2250 ft on the 28th and ice precipitation showers in the evening. Frost at low levels especially valley on the 29th with further wintry showers at times turning summits briefly white. Frost again at low levels on the morning of the 30th slight snow generally above 2500-2750 ft on northern slopes including Snowdon this persisting until the morning of the 31st.



On the 1st no snow could be seen on the mountains. Wintry conditions returned on the 20th with ice precipitation on the summits with a little snow at times.Snow on Carnedd Llewelyn in hazy November sunshine. On the 21st overnight precipitation rain at low levels, but cold enough to leave slight snow lying at 2650 ft and icy deposits as low as 2250 ft in places. The snow persisted on Carnedd Llewelyn and other summits on the 22nd in hazy afternoon sunshine will small amounts and ice remaining up to the 28th then absent during a very mild spell to the end of the month.




In very mild weather snow was absent at the beginning of the month. With summits conditions continuing mild, only occasionally wintry up to the 8th, no snow. Icy conditions prevailed on the tops especially on Snowdon on the 14th and 15th and during the day showers became wintry once again. Fresh snow on Carnedd Llewelyn on 16th December 2018.Overnight 15/16th rain turned to snow by morning leaving sprinkling of snow generally above 2850 ft and light covering snow on Foel-fras, Carnedd Llewelyn and Snowdon where in places on previous ice. Slight snow persisted on the tops on the 17th then overnight 17/18th temperatures rose to 6C as a warm from with rain moved across melting much of the snow. Overnight 18/19th a little fresh wet snow on summits over 2950 ft including C. Dafydd and Llewelyn. Snow patches were persisting on Snowdon and small pockets of ice on summits including Carneddau and Glyderau. various ice precipitations occurred up to the 22nd among the summits.


There was no lying snow on the mountains at the beginning of the month.



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 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 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 - 2018. All Rights Reserved.

    Page first published 14 August 2018 and will be updated during the season

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