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Summer in London is brilliant. There are rooftop bars to drink on, outdoor cinemas to watch old classics on and plenty of green spaces to throw a picnic blanket down on.

But there’s one element of roasting hot temperatures in the capital that’s sure to aggravate even the most seasoned of commuters.

When the temperature rises to the pleasant mid-20s above ground, it’s common knowledge that the Tube manages to maintain a climate that feels hotter than Death Valley.

And while every journey feels sticky, muggy and unpleasant, some Tube lines are significantly hotter than others.

TfL has, this week, revealed the temperatures of some of the most popular Tube lines, ranking them from hottest to coldest during the summer months.

The hottest line is, unsurprisingly, one of the oldest on the system. The baking Bakerloo line, hits an average temperature of 27C in 2016, peaking at a sweltering 31C in August.

Closely following is the Central line, which can hit temperatures of 26.1C at the height of rush hour - when you’re most likely to be wedged under several other people’s armpits.

Startling sights spotted on the Tube 9 show all Startling sights spotted on the Tube 1/9 Arctic Circle Line Brave: a young girl greets the 'bear' on a platform at Charing Cross Hannah Halden 2/9 Ill-judged outfit Shocking scene: A passenger apparently dressed as a suicide bomber 3/9 Mistletoe Northern Line: Mistletoe was spotted hanging in Tube carriages last week @tayadelacruz 4/9 Undaunted: A passenger stands with a green car door in the middle of a carriage 5/9 Identical Two women were pictured reading the Standard with matching shoes, dresses and Disney bags 6/9 Milistare Ed Milliband glares as he takes the Tube (Rob Crego) Rob Crego 7/9 Spartans Angry: Spartan 'soldiers' get up close and personal with some London commuters 8/9 Rescue mission Londoners had to free this man when his head got stuck in the doors of a Central line train 9/9 Maybe not on the Tube, but... A commuter snapped using a table as a seat in the first class carriage of a London commuter train 1/9 Arctic Circle Line Brave: a young girl greets the 'bear' on a platform at Charing Cross Hannah Halden 2/9 Ill-judged outfit Shocking scene: A passenger apparently dressed as a suicide bomber 3/9 Mistletoe Northern Line: Mistletoe was spotted hanging in Tube carriages last week @tayadelacruz 4/9 Undaunted: A passenger stands with a green car door in the middle of a carriage 5/9 Identical Two women were pictured reading the Standard with matching shoes, dresses and Disney bags 6/9 Milistare Ed Milliband glares as he takes the Tube (Rob Crego) Rob Crego 7/9 Spartans Angry: Spartan 'soldiers' get up close and personal with some London commuters 8/9 Rescue mission Londoners had to free this man when his head got stuck in the doors of a Central line train 9/9 Maybe not on the Tube, but... A commuter snapped using a table as a seat in the first class carriage of a London commuter train

If you’re looking for a breezy and significantly less sweaty commute this summer, it's the District, Circle, Hammersmith & City or Metropolitan lines that you'll want to reroute onto.

Thanks to the gods of air conditioning, the temperatures on these line average at a bearable 18.5C - meaning you won’t turn up to work looking like you’ve just stepped out of a sauna.