600 to 200 BC = Cold period
200 BC to 600 AD = “Roman Warming”
600 to 900 = Cold period (aka “The Dark Ages”)
900 to 1300 = “Medieval Warming”
1300 to 1850 = “Little Ice Age”
1850 to date = “Modern Warming”
- 1860 to 1875 = average temperature up for 15 years
- 1875 to 1890 = down for 15 years
- 1890 to 1903 = up for 13 years
- 1903 to 1918 = down for 15 years
- 1918 to 1941 = up for 23 years
- 1941 to 1976 = down for 35 years
- 1976 to 1998 = up for 22 years
- 1998 to 2015 = down for 17 years so far
Note: 1860 to 1978 measured using non-global surface thermometers
– 1979 to 2015 measured using global, and much more accurate, weather satellites