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

Llansadwrn (Anglesey) Weather:
Eryri (Snowdonia) Snowline Report

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Logo: Llansadwrn Weather - Melin Llynnon, Ynys Môn.

Eryri (Snowdonia) Mountains Winter Season 2023/24

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



September 2023

There was no snow observed in September.


Ice precipitation spotted on Carnedd Llewelynon 15 October 2023.

On the morning of the 14th there was some ice precipiation on Cairngorm, Scotland and in the afternoon as wintry showers spread across the mountaintops of Eryri a little ice precipitation was spotted fleetingly on the NW-facing slopes of Yr Wyddfa. On the 15th a little was seen remaining on the north-east of the Carnedd Llewelyn summit and again on the the morning of the 16th.




First lying snow of the season on Yr Wyddfa 0900 GMT on 29 November 2023.On the 28th there were showers of wet snow on the mountains of Eryri with sleet at times to low levels. Snow was seen in the afternoon on some summits and at 1000 ft in places in central mountaion areas. Snow fell overnight and settled as low as 2000 ft at the base of the Black Ladders and was lying in parts in north-facing slopes and on Yr Wyddfa (left) at 2500 ft at 0900 GMT on the 29th and was at a similar level on the 30th.





On the 1st light snow was lying at 2500 ft on the north-facing slopes of the Carneddau and Yr Wyddfa. Snow from showers fell on the 2nd with light snow lying at 2250 ft on the Carneddau. During the evening moderate to heavy snow fell on the summits with wet snow and rain at lower levels. Snow on the Carneddau on 3 December 2023.On the morning of the 3rd snow was lying at 2000 ft with 30% cover at 1800 ft settled at 1500 ft in places. There was a light to moderate covering across the range from Drum and westward on Moel Eilio and summits of Yr Eifl on Llyn. Fresh snow fell on the 5th and on the 6th snow was lying at 2000 ft. On the morning of the 7th snow was lying at 2250 ft with patches at 2000 ft. On the 8th there was broken snow cover above 2850 ft and snow patches surviving after rising temperatures and rain. On the 11th there were snow patches as low as 2500 ft with pockets of remnant snow/ ice left in places round summits...



January 2024

On the 5th and 6th there were wintry showers around the summits, a mixture of small hail and sleet. On the 7th there was slight snow seen lying above 2850 ft on the Carneddau, and 2500 ft on Yr Wyddfa on the 9th with snow patches on Garnedd Ugain, this persisting then becoming more broken by the 11th when there were moderate snow patches largest on the E flank of Carnedd Llewelyn and smaller elsewhere including icy remnants. Snow on the Carneddau on 9 January 2024.On the 14th fresh snow fell with light snow lying seen above 2500 ft in the morning some as low as 2000 ft on the Carneddau. Snow showers overnight with snow lying 2500 ft generally on the 15th, with some at 2000 ft under the Black Ladders, and dustings on Moel Eilio and summits of Yr Eifl on Llyn. Snow cover on Yr Wyddfa on 17 January 2024.On the 16th snow was lying at Ogwen and lightly on the northern slopes of the Carneddau at 450 ft. In the west Moel Eilio and Yr Eifl were capped with snow. Further showery snow overnight 16/17th and 17th/18th when snow was lying on the morning of the 18th at low levels, including Caernarfon, Menai Bridge and parts of Anglesey.

Snow on the Carneddau on 18 January 2024.On the 19th snow was lying around 750 ft with some snow and ice persisting as low as 300 ft in places. Snow patches were persisting on the 22nd around and above 2750ft some of these, cornices on cliffs and remnants survived to the end of the month.






A few small snow patches and cornices were present around and above 3000 ft at the beginning of the month. Remnants persisted, but were absent by the 7th. Light wet snow fell on the 8th in the west and was at 1000 ft at 0900 GMT. More significant snow fell in places in the east of the range. Broken snow was present above 2750 ft on the 9th with remnants as low as 2250 ft in places. Some snow patches and icy remnants were seen on the 13th these melting rapidly as temperatures rose to 9C and rain. Snow was absent until the 22nd when snow was seen on Carnedd Dafydd in a break in the cloud in the afternoon. Snow was seen on the summits on the 23rd before further fell in the afternoon and overnight 23/24th leaving light snow lying at 2000 ft at 0900 GMT on the 24th. On the 25th to 26th snow was lying at 2500 ft and was broken and thin by the 27th. Snow was absent at the end of the month.



Snow had returned on the 1st and was lying at 1500 ft and still snowing during the morning was settling at 1000 ft or below in places. Similar levels were observed on the 2nd with Moel Eilio and Yr Eifl summits on Llyn capped with snow. Snow capped Moel Eilio and summits of Yr Eifl on the 4th and was lying at 2000 ft on the Carneddau with 30% cover at 1500 ft. On the 5th broken snow was lying on the north-facing slopes Carneddau above 2500 ft with some snow as low as 2000 ft in places. Gully snow and cornices were seen on some cliffs. On the 6th snow had disappeared on Moel Eilio and Yr Eifl and by the 14th was absent on Yr Wyddfa and elsewhere. Turning colder there was a little ice precipitation on the tops on the 23rd. On the 26th there were remnants around the summits and on the 27th sleet and snow showers in the afternoon. Overnight snow fell widely and on the morning of the 28th was lying at 1000 ft at Ogwen and Llandegai and as low as 350 ft on the Carneddau, Glyderau and Yr Wyddfa, Moel Eilio and Yr Eifl also had snow lying to low levels (sea level was reported). Thaw was rapid at lower levels, on the 29th snow was lying at 2500 ft remaining around highest summits at 3250 ft on the 31st with a few patches at 2250 ft.


On the 1st there were areas of old drifted thawing snow with a 30% cover in places as low as 2750 ft. Broken snow and old drifts remained on the tops of the Carneddau on the 2nd with several small patches and remnants at 2750 ft and one at 2650 ft. On the 4th broken snow was present on the tops of the Carneddau with gully patches and thawing remnants at 2750 ft. There was little left on Yr Wyddfa in the afternoon.

Snowdonia snowline current histogram.


  • 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 Eryri/ Snowdonia 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

  • MWIS Mountain Weather Information Service MWIS

  • Cairngorm

  • 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 2022-2023. Winter 2022-2023
    Winter 2021-2022. Winter 2021-2022
    Winter 2020-2021. Winter 2020-2021
    Winter 2019-2020. Winter 2019-2020

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

  • Winter 2022-2023. Winter 2022-2023
    Winter 2021-2022. Winter 2021-2022
    Winter 2020-2021. Winter 2020-2021
    Winter 2019-2020. Winter 2019-2020

  • 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 - 2024. All Rights Reserved.

    Page first published 14 September 2023 and will be updated during the season

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