The ninth century seems to have experienced a warmer climate, which has been called the Medieval Warm Period.
But from the 14th century things were different. It rained "without stopping" in 1315, and grain didn’t ripen. The situation was much the same the following year. Later in the 14th century there were several episodes of wild weather and cold periods.
The Little Ice Age can be divided into two phases, according to an article in The New Yorker. It began with a cooling period in 1300 - 1400. The coldest period was from the end of the 1500s to 1850.
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