page_title: Västerås
section_title: Climate
hierarchical_section_title: Västerås / Climate
caption_attribution_description: Tagen 3000' ovanför Västerås
context_page_description: Västerås is a city in central Sweden on the shore of Lake Mälaren in the province of Västmanland, 100 kilometres west of Stockholm. The city had a population of 127,799 in 2019, out of the municipal total of 154,602.
  Västerås is the seat of Västerås Municipality, the capital of Västmanland County and an episcopal see.
context_section_description: According to the Köppen climate classification, Västerås experiences a humid continental climate bordering, according to the original −3 °C (27 °F) isotherm, an oceanic climate (Dfb/Cfb) with cold winters and warm summers.
  Summers tend to be quite unpredictable with sunny spells but with a risk of sudden showers. The sunniest weather usually occurs when high-pressure systems are blocking the low-pressure systems that usually move in from the Atlantic Ocean. Daytime temperatures in July mostly hover around 22 °C (72 °F), but may sometimes exceed 25 °C (77 °F) and occasionally even 30 °C (86 °F).
  Winters are usually cold with a snow cover that lasts for several months. Some winters can be mild with longer spells without snow on the ground. The weather differs a lot whether the air masses are coming from the Atlantic Ocean or from the Eurasian continent. In the first case, temperatures over 5 °C (41 °F) might be expected. In the second case, the temperature may not rise above −15 °C (5 °F) in the middle of the day. Lake Mälaren is usually frozen from December until the end of March.
  The highest official temperature reading of 36.0 °C (96.8 °F) was recorded on July 9, 1966. The lowest temperature of −36.5 °C (−33.7 °F) was recorded on January 24, 1875.
caption: Aerial photo of a wintry Västerås.
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