New TfL data reveals the Victoria line is the hottest Tube line

According to monthly data gathered by TfL the Victoria line was the hottest line last year with an average temperature of 28.2C.

During its warmest month in September, temperatures reached a sweltering 31C and during its coolest month they went down to 25C.

The next warmest lines were the Central (26.7C) and Bakerloo (26C) with the air-conditioned Circle, Hammersmith & City, District and Metropolitan lines the coolest (19.3C).

TfL says it has "removed heat from our station and tunnel environment by installing new ventilation or cooling solutions" including doubling the capacity of its 13 ventilation shafts on the Victoria line.

Platform temperatures on the Tube are routinely monitored using data loggers, according to TfL.

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Full list of average Tube temperatures (TfL figures 2023)

• Victoria line (28.2 C)
• Central line (26.7C)
• Bakerloo line (25.9C)
• Northern line (25.3C)
• Piccadilly line (23.8C)
• Jubilee line (21.8C)
• Waterloo & City line (20.5C)
• Circle, Hammersmith & City, District and Metropolitan lines (19.3C)