*** The average temperature of the Earth during the Jurassic period was around 16.5°C (61.7°F). This is warmer than the current average temperature.
The Earth's current global average surface temperature is approximately 15°C (59°F), though it's fluctuating by about 2°C (4°F) above or below that figure on a monthly basis.
Image caption
Global surface temperatures were generally high throughout the Paleocene and Eocene, with a particularly warm spike at the boundary between the two geological epochs around 56 million years ago. Temperatures in the distant past are inferred from proxies, in this case, oxygen isotope ratios from fossil foraminifera, single-celled marine organisms. "Q" stands for Quaternary. Graphic produced using data from Zachos and Hansen, with help from Dr. Carrie Morrill, Director of the World Data Service for Paleoclimatology.
