The climate table below presents weather data from the years 1981–2010 although the official Köppen reference period was from 1961 to 1990. According to ongoing measurements, the temperature has increased during the years 1991–2009 as compared with the last series. This increase averages about  overall months. Warming is most pronounced during the winter months, with an increase of more than  in January. For the 2002–2014 measurements some further increases have been found, although some months such as June have been relatively flat.