This will help to prevent your seedlings and plants dying in the frost. Email: Location: Barrow Birmingham Camberley Cambridge Cardiff Chepstow Christchurch City of Derry Airport Colchester Doncaster Edinburgh Glasgow Godalming Godalming Guildford Khatmandu Kingston Upon Thames Liverpool London Manchester Moscow Mytchett Newport Oulu Oxford Reading Reykjavik San Francisco Sheffield Walney Island Airport Watford Whitchurch York Lower than Temperature: degrees C