David Fraser
Senior Member.
Recently Look-Up.org.uk made a claim that the Met Office had informed him that the temperature for the formation of contrails must be -57C
https://www.facebook.com/permalink.php?story_fbid=1416500845255774&id=1410029482561123&stream_ref=10
I contacted the Met Office myself and I received the same response as above. I challenged the figure of -57C and after a few emails I received this response.
Simply they made a mistake and hopefully are in the process of correcting their standard email about contrails.
https://www.facebook.com/permalink.php?story_fbid=1416500845255774&id=1410029482561123&stream_ref=10