Almost the entire surface of the national park is situated above the 2,000 m, being its climate characterized by large thermal fluctuations, strong winds, low precipitation and high insolation. In general, due to the fact it is located above the sea of clouds (concentration of the trade winds on the island), in the park you can enjoy magnificent blue skies that contrast with the often more cloudy areas of the North and East of the island.
The precipitations are mainly concentrated in the months from October to March and tend to be in the form of snow. The snowfalls cover the Teide and the Cañadas with a spectacular white cloak . Due to the strong thermal fluctuations between day and night (it can be between 10 and 20 º C) the snow usually doesn't last long. Due to the night frosts, it is usual that the landscape dawns white and, as the day goes by, it recovers its habitual colour. During the cold season, it is common to find a strange phenomenon called the cencellada, which consists of large ice crystals up to 15 centimetres that hang on the leaves of plants.
For the visitor, it is important to know this climatic uniqueness and to have in mind that there can be changes, sometimes abrupt, in the climate of the summit. As an example, the appearance of the characteristic sombrerito (little hat) on the peak of Mount Teide may indicate the entry of upper winds or even storms. To this must be added the presence of microclimates, each of them with special thermal characteristics.
It is also very important to take into account the problem of the solar radiation (the highest in Spain), due to the actual number of hours of sunshine and the cleanness of the atmosphere in this area, which makes the radiation index in this place very high.
This rigorous climate made the local flora and fauna acquire especially particular characteristics in order to adapt.
To check the weather forecast:
http://www.aemet.es/en/eltiempo/prediccion/comunidades?k=coo&w=&o=pais
http://www.tutiempo.net/Tiempo-Provincia-Santa-Cruz-de-Tenerife-E38.html.