We cannot acurately predict the Earth’s temperature yet.
It is a statistical FACT that since Galliello Callilie first noticed them through his newly invented telescope around 1608 and started counting them, whenever sunspots are few the Earth is cold and whenever sunspots are abundant the Earth is warm.
Current solar cycle data seems to be past the peak
Posted on April 9, 2013
by Anthony Watts
Marshal Space Flight Centre.
The Sunspot Cycle (Updated 2013/04/01)
“Early records of sunspots indicate that the Sun went through a period of inactivity in the late 17th century. Very few sunspots were seen on the Sun from about 1645 to 1715 (38 kb JPEG image). Although the observations were not as extensive as in later years, the Sun was in fact well observed during this time and this lack of sunspots is well documented. This period of solar inactivity also corresponds to a climatic period called the “Little Ice Age” when rivers that are normally ice-free froze and snow fields remained year-round at lower altitudes. There is evidence that the Sun has had similar periods of inactivity in the more distant past. The connection between solar activity and terrestrial climate is an area of on-going research.”