Final answer:
The warmest UK location on average in 2015 is likely in Southern England, influenced by the Gulf Stream that contributes to milder climate conditions despite the region's northern latitude.
Step-by-step explanation:
The question regarding the warmest UK location on average in 2015 relates to Geography, as it involves climate and regional temperatures in the United Kingdom. The UK's climate is moderated by its proximity to the ocean and the influence of the Gulf Stream, which pulls warm water from the tropics. This effect is particularly pronounced in Southern England, which includes London, known for its economic significance and high population density. In 2015, the warmest locations in the UK would likely have been in this Southern region given its milder climate.
It is important to note that the average annual temperature on Earth has been rising for the past 100 years, which could contribute to warmer temperatures in places like the UK. Among the various factors impacting seasonal and annual temperatures, the Gulf Stream plays a crucial role in maintaining moderate climatic conditions in the British Isles despite their northern latitude.