The climate in London is relatively temperate, but there is such a variety of ways for different parts of the city to feel, especially during the summer months, that some streets may remain somewhat cool, while others become very uncomfortable (especially in the afternoons and evenings). The thing that causes these differences in how different streets and places within the city are felt to be, in terms of comfort, is the interaction of different urban features with the effects of heat, sunlight, and airflow.
The Role of Greenery and Shade
Also, when water evaporates from the leaves of trees (a process called evapotranspiration) and is released into the air, it has the effect of cooling off air that will ultimately come into contact with the area surrounding the tree(s). A street with large amounts of vegetation will tend to be significantly cooler than a street with a minimal amount of vegetation.
Building Materials and Street Design
In addition to how the vegetation impacts temperature, the materials used to construct the roadways and the buildings on or adjacent to the road play another major role in impacting how much heat is retained by the roadways and the amount of time(s) they release heat. For example, dark surfaces (such as asphalt or concrete) absorb a large amount of heat during the day and slowly give that heat up over an extended period of time; therefore, compared to lighter-coloured roadways, dark-coloured roadways would create longer-lasting heat than their light-coloured counterpart.
Beyond the contribution that street vegetation and building materials contribute to the creation of heat retention in cities, the configuration of a street can also play a role. For example, narrow streets with tall buildings on either side of the street can trap heat and create what is commonly referred to as an “urban canyon”.
Airflow, Traffic, and Human Activity
In addition to the way air flows within a defined area, the number of vehicles driven and the number of people who live or work on/near a given street will have an impact on how hot a space feels. Streets with many vehicles moving at high speeds create additional heat (primarily from the engines of the vehicles themselves) and therefore can contribute significantly more heat to a surrounding area than a street that is not heavily travelled. In commercial buildings where many people are present (and where there are many activities going on during the day), there are far greater amounts of heat created than if you were only to occupy the same space in a residential building (where there are typically far fewer people).
Final Insight
As our world warms due to climate change, understanding this will be increasingly important for urban planners. Because of this, urban planners have begun implementing solutions into their designs to enhance the existing trees, improving airflow, and reducing high heat-absorbing structures to create more comfortable environments.
FAQs
1. Why do tree-lined streets feel cooler?
Because trees provide shade and release moisture into the air, which helps lower temperatures.
2. What is the urban heat island effect?
It is when cities become warmer than surrounding areas due to buildings, roads, and human activity.
3. Do building materials affect temperature?
Yes, materials like asphalt and concrete absorb and retain more heat than lighter or reflective surfaces.
4. Why are busy streets hotter?
Traffic, pollution, and human activity generate additional heat, raising overall temperatures.
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