July and August are Tenerife's high summer months, with temperatures in the 80s all over the island, though you may find it to be cooler on the north end of the island and at the beaches due to the cooling trade winds that prevail in the Canary Islands. These months are generally dry, and humidity throughout the year is low.
Tenerife, which is at the same latitude as the Sahara Desert, experiences most of its rain and some of its coolest temperatures in December. That said, daytime temperatures are still in the low 70s and rain is limited to about five days in December. January is the coolest month of the year with average temperatures right at about 70 degrees Fahrenheit, while February and March are very pleasant and in the low 70s.
The north-northeast parts of Tenerife are the coolest and wettest, though the island doesn't get much rain. The north side, where San Cristobal de La Laguna is located, averages about 14 inches of rain annually, with November, December and January being the wettest months. Even so, San Cristobal gets about two inches of rain in each of these months. Temperatures are a few degrees cooler than the island average, and there often huge cloud banks over this area.
Santa Cruz de Tenerife, on the south end of the island, is generally warmer and clearer than the north. The climate is considered subtropical, and the town receives about nine inches of rain per year. January and February are the rainiest months, with about 1.4 inches, but daytime temperatures still range from about 65 to 70 degrees Fahrenheit.
The largest mountain on Tenerife, El Teide is the dividing line for climate changes. More than 12,000 feet above sea level at its highest point, El Teide is the highest mountain in Spain and, as such, it gets snow during the winter.
