The Medieval Warm Period (MWP) (900-1300) was a period during the Middle Ages of high sunspot count and warm temperatures globally. Some scientists and researchers argue that the MWP was only in Europe, others say it was only the Northern Hemisphere, while others, like myself, argue that it was a global phenomenon.
Temperatures in Europe, Asia and Africa during this time were quite warm, summers were longer and winters were milder and shorter. Due to the warmth, empires and economies thrived during this 400 year stretch of warm climate. Crops were able to be grown and people were able to make a living as we do today.
Some of the proxy data shows that the Sierra Nevada mountains in North America went through an extended period of drought, which lasted a decade at a time or longer. The drought conditions were similar to what we have seen over the past couple of years. The proxies also point to extended drought conditions in parts of Australia and the Eurasian Steppe, while Northern China experienced extended periods of drought and excessive rainfall.
It should also be mentioned that the Vikings were starting to explore during this time. They landed on Greenland and they started farming on the southern half of the land mass, hence, how Greenland got it’s name. In about 100 or so years after the Vikings settled, they were forced out of Greenland as the MWP came to an end and the Little Ice Age began.
We don’t have thermometer data dating back to the Middle Ages. Accurate thermometers weren’t invented until the 1850s. We have climate proxy data from tree rings, fossils, ice cores, and sediment cores which can give us an estimate of what the climate was like from 100 years ago to three or more billion years ago. We can also look at diaries and historical documents which give an idea of what the climate was like for a certain time period. I argue that the Medieval Warm Period was global. There is absolutely NO evidence to support the statement that the MWP was only in Europe or the Northern Hemisphere. All evidence supports my theory, that the Medieval Warm Period was global. This map below from the Skeptical Science Blog proves that the MWP was a ‘global phenomenon’ by giving a map of the globe with temperature graphs from climate proxy data going back thousands of years, up to the present. As you can see by the graphs, the MWP was global.
The map below is called Medieval Warm Period map. It shows us a map of the world with different points. When you click on the point, it will give you details about the place. It also gives you a link to the source and graph.
I analyzed the data to see if Skeptical Science was right about it being a global phenomenon. So, here are my conclusions.
The MWP map gave five different datasets; places that were warmer than today, places that were cooler than today, places that had the same temperature as today, places that were drier, and places that were wetter.
The results show that the Medieval Warm Period was global which supports Skeptical Science’s post. Out of 1,143 locations, 548 of them were warmer than today (48%), 41 locations were cooler than today (4%), 85 locations had the same average temperature as today during the MWP (7%), 216 locations were drier (19%), and 253 were wetter (22%).
If we want to compare just temperature data, then we will have to get rid of the hydroclimate data, which leaves us with 648 locations.
If we look at the results above, we can see that around 81% of the world had above normal temperatures and it was warmer than today. during the MWP, and only a little under 19% of the world was cooler than today.
The MWP was somewhere around 2 to 3.5 degrees Celsius warmer than today.
NASA’s James Hansen confirmed this in 1981.
The IPCC shows us the same graph in their 1990 report.
However, due to the climate change scam, NASA and the climate alarmists no longer shows the MWP.