Quality Management Area, implemented to counter high levels of nitrogen dioxide in the atmosphere. Climate The city has an oceanic climate. (Köppen: Cfb). Cambridge has an official weather observing station, at the Cambridge University Botanic Garden, about south of the city centre. In addition, the Digital Technology Group of the university's Department of Computer Science and Technology maintains a weather station on the West Cambridge site, displaying current weather conditions online via web browsers or an app, and also an archive dating back to 1995. The city, like most of the UK, has a maritime climate highly influenced by the Gulf Stream. Located in the driest region of Britain, Cambridge's rainfall averages around per year, around half the national average, The driest recent year was in 2011 with of rain at the Botanic Garden and at the NIAB site. This is just below the semi-arid precipitation threshold for the area, which is 350mm of annual precipitation. Conversely, 2012 was the wettest year on record, with reported. Snowfall accumulations are usually small, in part because of Cambridge's low elevation, and low precipitation tendency during transitional snow events. Owing to its low-lying, inland, and easterly position within the British Isles, summer temperatures tend to be somewhat higher than areas further west, and often rival or even exceed those recorded in the London area. Cambridge also often records the annual highest national temperature in any given year – in July 2008 at NIAB and in August 2007 at the Botanic Garden are two recent examples. Other years include 1876, 1887, 1888, 1892, 1897, 1899 and 1900. The absolute maximum stands at recorded on 19 July 2022 at Cambridge University Botanic Garden. Before this date, Cambridge held the record for the all-time maximum temperature in the UK, after recording on 25 July 2019. Typically the temperature will reach or higher on over 25 days of the year over the 1981–2010 period, with the annual warmest day averaging over the same period. The absolute minimum temperature recorded at the Botanic Garden site was , recorded in February 1947, although a minimum of was recorded at the now defunct observatory site in December 1879. More recently the temperature fell to on 11 February 2012, on 22 January 2013 and on 20 December 2010. The average frequency of air frosts ranges from 42.8 days at the NIAB site, to 48.3 days at the Botanic Garden per year