There was a mini ice age in the middle of the 16th century. Bullinger wrote about it in his Diarium. The mini ice age was so severe that Bullinger considered that it was the judgment of God.
Otto Ulbricht has written “Extreme Wetterlagen im Diarium Heinrich Bullinger” which is to be found in Wolfgang Behringer, Hartman Lehmann dan Christian Pfister (eds), Kulurelle Konsequenzer der kleinen Eiszeit, pp147-175.
The following is a citation from the summary of the article:
“When looking closely at Bullinger’s diary, it becomes clear that he not only sensed the climatic change beginning in the early 1560’s (coldness, frost, hail frozen over lakes, floods), but he also described it as unique and sometimes even as a breakdown of the natural order of things. Adjectives he applied to characterize these changes have strong (and negative) emotional connotations. The extreme weather conditions – sometimes joined by famine – became the most important expression of God’s wrath in his thinking, thus displacing war and pestilence as secondary.
According to Bullinger, the main reason for God’s scorn was heavy drinking. Therefore, he and his colleagues tried to extend mandates against it to leading and secular authorities in Zurich. Religious reasons also played a role in keeping interest rates down throughout the famine of 1570/71. During this crisis, there was a major change in the liturgy through the introduction of common public prayer.”