Many people planning to holiday in Snowdonia, the Highlands of Scotland or the Lake District this summer will be considering a walk on the hills or mountains. If you are planning one of the high walks, apart from your fitness and how sore your feet will get, one of your main considerations will be the WEATHER.

Before you start on your walk you will be getting together your hiking shoes, filling your backpack with provisions but please dont forget to CHECK THE WEATHER! The Met Office has forecasts for the Lake District, Snowdonia and Scotland. Even if it looks like it is going to be a nice day you can never be certain what is going to sweep in across the hills. If you are walking Ben Nevis or Snowdon you can be on the hills for most of the day plenty of time for the weather to change! Knowing and being prepared for the weather conditions will add to your enjoyment of your day, and will keep you safe.

Weather on the mountains is very unpredictable almost unbelievably so at times. It is very possible that you will choose a lovely clear day for your climb, and will start the day in a tee shirt with the sun beating down on your back.

As you start to climb higher you may find that cloud begins to form, and the summit will be hidden from view! You will be safe if you keep to the well trodden paths, but it is really not advisable to go too far from the track. The cloud and mist can form very quickly and become very thick and it is very easy to quickly become disorientated and lose your way.

Another thing you will notice as you climb the mountain is that the temperature will drop. It will certainly be much colder at the top than at the bottom - particularly in low cloud. The average temperature on the summit of Ben Nevis is -1 degree centigrade. You will need to take a jumper even if you start off on a warm summers day, and will also need a waterproof in case of low cloud or mist - this can be very wet, and if you are not suitably prepared, your clothes will get sodden.

Visit http://www.mountainwalk.co.uk/weather.html to see examples of weather changes on walks up Snowdon and Ben Nevis. The photographs on this page were all taken on the same walk on an early August day up the Watkins Path of Mount Snowdon. The day started off without a cloud in the sky - three hours later we were scrambling through thick cloud and near gale force winds, getting very wet. Once the summit of Snowdon was reached there were no photo opportunities apart from being able to see nothing through the cloud, there was also the strong wind that threatened to blow walkers off the top of the cairn!

Snowdon does have the benefit of its summit cafe although it can get very crowded. When you walk up Snowdon you can feel that you have achieved something, even if mist spoils the view. And on top of that you can have a cup of tea or hot soup to warm you for the way down - a luxury not found on many peaks!

And just to show mountains have the same typical weather, the same web page shows a walk up Ben Nevis. Again the start of the walk up has the sun shining, but the summit shrouded in mist!

The lesson is be prepared - and especially so on in late spring or early autumn where you could finding yourself scrabbling through snow on the higher peaks and hills.

And if you are a novice walker it is best to avoid the worst weather of the winter months entirely, unless you go with an experienced guide.