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Geography

The three country point: the tripoint of the border between Germany, Belgium and the Netherlands

Aachen lies on the tripoint of Germany, the Netherlands, and Belgium in the middle of the Meuse–Rhine Euroregion, which contains an open valley basin and includes tributaries of the Wurm and the Rur rivers. The city is located in the basin of the Meuse, directly on the northern edge of the Eifel region of the Rhenish Massif, about {{safesubst:#invoke:convert|convert}} north of the High Fens.

The highest point of Aachen measures 410 m Normalnull (NN) and lies in the far southeast of the city. The lowest point is 125 m NN and is located in the north, on the border with the Netherlands. The length of the city border is {{safesubst:#invoke:convert|convert}}, {{safesubst:#invoke:convert|convert}} of which border Belgium and {{safesubst:#invoke:convert|convert}} border the Netherlands. From north to south, the city is {{safesubst:#invoke:convert|convert}} at its widest, and from east to west, it is {{safesubst:#invoke:convert|convert}}.{{ safesubst:#invoke:Unsubst||date=__DATE__ |$B= {{#invoke:Category handler|main}}{{#invoke:Category handler|main}}[citation needed] }}

Climate

As the westernmost city in Germany<ref name=munro>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref> (and close to the Low Countries), Aachen and the surrounding area belongs to a temperate climate zone, with humid weather, mild winters, and warm summers. Because of its location north of the Eifel and the High Fens and its subsequent prevailing westerly weather patterns, rainfall in Aachen (on average 805 mm/year) is comparatively higher than, for example, Bonn (with 669 mm/year). Another factor in the local weather forces of Aachen is the occurrence of Foehn winds on the southerly air currents, which results from the city's geographic location on the northern edge of the Eifel.<ref name=climate>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref>

Because the city is surrounded by hills, it suffers from inversion-related smog. Some areas of the city have become Urban heat islands as a result of poor heat exchange, both because of the area's natural geography, as well as from human activity. The city's numerous cold air corridors, which are slated to remain as free as possible from new construction, therefore plays an important role in the urban climate of Aachen.<ref>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref>

The January average is {{safesubst:#invoke:convert|convert}}, while the July average is {{safesubst:#invoke:convert|convert}}. Precipitation is almost evenly spread throughout the year.

- {{#invoke: WeatherBox | buildRow | mode = basic | group_name = sun
colspan="14" Climate data for Aachen, Germany for 1981–2010 (Source: DWD)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year

{{#invoke: WeatherBox | buildRow | mode = temperature | group_name = record high

color_scheme = t label = Record high °C (°F) annual_mode = max }}

{{#invoke: WeatherBox | buildRow | mode = temperature | group_name = high

color_scheme = t label = Average high °C (°F) annual_mode = avg }}

{{#invoke: WeatherBox | buildRow | mode = temperature | group_name = mean

color_scheme = t label = Daily mean °C (°F) annual_mode = avg }}

{{#invoke: WeatherBox | buildRow | mode = temperature | group_name = low

color_scheme = t label = Average low °C (°F) annual_mode = avg }}

{{#invoke: WeatherBox | buildRow | mode = temperature | group_name = record low

color_scheme = t label = Record low °C (°F) annual_mode = min }}

{{#invoke: WeatherBox | buildRow | mode = precipitation | group_name = precipitation

date_mode=true prefer_cm = Expression error: Unrecognized punctuation character "{". label = Average precipitation mm (inches) annual_mode = sum }}
date_mode = true | scale_factor = 1 label = Mean monthly sunshine hours annual_mode = sum }}
colspan="14" style="text-align:center;font-size:95%;" Source: Data derived from Deutscher Wetterdienst<ref>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref>

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