Nellie, you're absolutely right. February is generally the worst month in the Canaries. This year there has been a terrible storm the 2nd feb (just google tenerife tormenta febrero and you'll find pictures, you tube...). Beaches were full of mud, trees, stones, for 2 weeks ....Hotels isolated during days due to floods of the barrencos, and I am talking about South Tenerife. Tourists were trapped at the Sheraton in Costa Adeje... You can be lucky and have a very nice week, or you can get rain and storm. This year, Feb 2010, def more than just 2 days of rain!!
It really depends on where you stay as some areas get hit with the rain and just 10 mins down the road and you have blue skies and sun, it can be very bizar. I live in Las Chafiras, near the Tenerife south airport and if it is going to be miserable it is normally there, my luck haha.
This month, 2 weeks ago we had a terrible storm, quite a lot of damage donr from the winds but the North was much worse off with 6 people dead ... tragic!
All i remember of last feb was the 2 days of rain but as i said, 10mins down the road can be totally different.
It really does vary but i dont find the month of feb so bad and i have lived here for 3 years now.
April onwards is alovely time to b here as it is not too hot before the summer heat of july-sept.