32.5 metres (107 feet) above sea level and lies in Friedehorst Park in the northwestern borough of Burglesum. As a result, Bremen has the lowest high point of all the German states. Climate Bremen has a moderate oceanic climate (Köppen climate classification Cfb) due to its proximity to the North Sea coast and temperate maritime air masses that move in with the predominantly westerly winds from the Atlantic Ocean. However, periods in which continental air masses predominate may occur at any time of the year and can lead to heat waves in the summer and prolonged periods of frost in the winter. In general though, extremes are rare in Bremen and temperatures below and above occur only once every couple of years. The record high temperature was on 9 August 1992, while the official record low temperature was on 13 February 1940. On 13 October 2018, Bremen recorded its warmest October day on record with 28.6 °C (83.4 °F). However, the astronomer Heinrich Wilhelm Matthias Olbers reported to have measured −27.3 °C on 23 January 1823. Being at some distance from the main North Sea, Bremen still has a somewhat wider temperature range than Bremerhaven that is located on the mouth of Weser. Average temperatures have risen continually over the last decades, leading to a rise in the mean annual temperature between 1961–90 and 1981–2010 reference periods. As in most parts of Germany, the year 2014 has been the warmest year on record averaging , making Bremen the second-warmest German state after Berlin in 2014. While Bremen is located in the comparatively cloudy northwestern part of Germany, there has been a significant increase in average sunshine hours over the last decades, especially in the months of April, May, and July, causing the annual mean to rise by 121 hours between the reference periods of 1961–90 and 1991–2020. This trend has continued over the last 10 years (2011–2020), which average 1680 hours of sunshine, almost 200 hours more than in the international reference period of 1961–90. Nevertheless, especially the winters remain extremely gloomy by international standards with December averaging hardly more than one hour of sunshine (out of 7 astronomically possible) per day, a feature that Bremen shares with most of Germany and its neighbouring countries, though. Precipitation is distributed fairly even around the year with a small peak in summer mainly due to convective precipitation, i.e. showers and thunderstorms. Snowfall