Winters in Bregenz are cold and unpredictable, with temperatures often dropping below freezing in January and February. Spring is a gradual warming period, with temperatures slowly rising into the mid-teens by April and May. Summer brings mild and pleasant weather, with highs occasionally reaching above 30 degrees Celsius in June and July. Autumn is characterized by a decline in temperature, with cooler nights returning by September and October. The coldest months are December and January, while the warmest month is usually June or July.