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Weather in Stockholm

Stockholm Weather

Climate
Stockholm, with a February mean of −3.0 °C (26.6 °F), had a humid continental climate (Köppen Dfb) for the most recent official reference period. Due to the city's high northerly latitude, daylight varies widely from more than 18 hours around midsummer, to only around 6 hours in late December. Despite its northern location, Stockholm has relatively mild weather compared to other locations at similar latitude, or even farther south. With an average of just over 1800 hours of sunshine per year, it is also one of the sunniest cities in Northern Europe, receiving more sunshine than Paris, London and a few other major European cities of a more southerly latitude. Due to recent mildening of the climate it could be classified as cold marine with significant continental influence if the −3 °C (27 °F) isotherm is used. The urban heat island combined with prevailing wind travelling over land rather than sea during summer renders Stockholm to have the warmest summers in the Nordic countries.

Summers average daytime high temperatures of 20–25 °C (68–77 °F) and lows of around 13 °C (55 °F), but temperatures can reach 30 °C (86 °F) on some days. Days above 30 °C (86 °F) occur on average 1.55 days per year (1992-2011). Days between 25 °C (77 °F) and 30 °C (86 °F) are relatively common especially in July and August. Nighttime lows of above 20 °C (68 °F) are rare, with the hot summer nights roaming around 17 to 18 °C (63 to 64 °F). Winters generally bring cloudy weather with the most precipitation falling in December and January (as rain or as snow). The average winter temperatures ranges from −3 to −1 °C (27 to 30 °F), and occasionally drop below −20 °C (−4 °F). Spring and autumn are generally cool to mild.

The climate table below presents weather data from the years 2002–2014 although the official Köppen reference period was from 1961–1990. According to ongoing measurements, the temperature has increased during the years 1991–2009 as compared with the last series. This increase averages about 1.0 °C (1.8 °F) over all months. Warming is most pronounced during the winter months, with an increase of more than 2.0 °C (3.6 °F) in January. For the 2002–2014 measurements some further increases have been found, although some months such as June have been relatively flat.

The highest temperature ever recorded in Stockholm was 36 °C (97 °F) on 3 July 1811; the lowest was −32 °C (−26 °F) on 20 January 1814. The temperature has not dropped to below −25.1 °C (−13.2 °F) since 10 January 1987.

Annual precipitation is 539 mm (21.2 in) with around 170 wet days and light to moderate rainfall throughout the year. Snowfall occurs mainly from December through March. Snowfall may occasionally occur in late October as well as in April.

In Stockholm, the aurora borealis can occasionally be observed.

source: wikipedia