It Resulted in crop failure
Famine.
The lives of all medieval Europeans were tied to the fortunes of agriculture. In the twelfth and thirteenth centuries a gradually warming climate lengthened the growing season in northern Europe, making it possible to grow more grain even on less arable land. This trend was reversed at the end of the thirteenth century and in the fourteenth century the European mainland became progressively colder. This caused changes in rainfall patterns, shortened the growing seasons and lessened the productivity of cereal agriculture. Europe's vulnerability to climatic change came in 1315 during the great famine in northern Europe.
Western
the alps
That depends on where you live. In North-western Europe the climate is mild, but at Italie and the surrounding countries, the weather is very sunny and warm.
No, But weather can move radiation around if it is already in the air like it has been with the Fukushima accident in Japan and then back in Europe in the Chernobyl event.
in europe it was summer rains and bad weather
The cut off contact with Japan A+
Black plague
Crop Failure
The cut off contact with Japan A+
Heavy rains resulted inflooding, crop failure, and the famine of 1315-1317. The problem was not confined to those years, however, and existed over a period of decades. There are links below.
In the fourteenth century, the Black Death was plaguing Europe.
feudalism
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D. Competition among rival states
The fourteenth century in Europe did not differ demographically from the High Middle Ages much. The large-scale migration of peoples all over Europe had mostly happened between 400 and 800 AD . The later Viking migrations into England, Russia and Sicily had happened in the centuries thereafter, but by the 13th century big demographic shifts had become a thing of the past. The only very notable change was that the 14th century had seen the second Great Plague, also known as the Black Death, that killed between 50 and 70% of Europe's population.
Actually, it came from China to India and then down to Europe. Many historians think it came through Italian ports.