(Äp'É-nÄf'rÄ­n) A hormone that is secreted by the adrenal gland in response to physical or mental stress, as from fear, and is regulated by the autonomic nervous system. The release of epinephrine causes an increase in heart rate, blood pressure, and respiratory rate.
The average maximum daytime temperature in Sicily in December is a comfortable 16Â°C (61Â°F), while the average minimum night-time temperature is a cool 11Â°C (52Â°F). On average 90 mm (3.5 inches) of rain normally falls in Sicily during December with rain falling on 12 days of the month.
Averages for Palermo in December. By the end of the year, the crowds have thinned greatly and the temperatures in Palermo have dropped. Even with the cooler temperatures, this is a great time of the year to visit, as youâll still get warmer temperatures than most of Europe gets this time of the year.