Even in the middle of winter, the temperature rarely dips below 15°C / 59°F, and you'll often find temperatures exceeding 20°C/ 68°F in Gran Canaria in December, January and February! The summer average temperature is only around 24°C/ 75°F, so there really isn't much differentiation between the two.
Which is the warmest Canary Island at Christmas?
LanzaroteNew Year's Eve is also a fun night out. Gran Canaria and Lanzarote are the hottest of the islands in December.