The Welsh 3000s Challenge is not an organised race or event. It is generally undertaken by individuals or groups of friends who decide on an appropriate date for themselves.
Most people walk it as close to the 22nd June as possible. This gives the maximum amount of light, but is before the temperature starts to get too high.
At this time of year sunrise is about 5am and sunset is about 10pm.
USNO sunrise/sunset calculator can be used to work out sunlight hours.
(Snowdon is 4 degrees 5 minutes west, 53 degrees 4 minutes north. BST is equal to being one hour east of Greenwich.)
The weather will be key in determining whether you complete this walk, and your completion time. It is therefore important not to have a set date on which you are going to walk, but to be flexible.
It’s almost impossible to find the perfect day, but you are likely to be slowed down if it is:
The weather will also effect the quality of sleep that you get at the top of Snowdon the night before the walk (along with the amount of noise created by other people during the night, as Snowdon is a busy place this time of year!).
Met Office - Snowdonia forecast
MWIS - Snowdonia forecast
Metcheck - forecast for Snowdon or Glyder Fawr (use 2nd pulldown)
Snow-Forecast - 6 day Snowdon forecast
Ogwen Mountain Rescue - Y Garn webcam