Interesting from met office This Evening and Tonight:
Many areas dry and becoming frosty overnight as temperatures fall under clear skies. Cloudier conditions are likely to prevail south of Manchester, with occasional light snow flurries possible here and perhaps over the Pennines. Minimum temperature -3 °C.
Tuesday:
Any light sleet or snow in the south should clear to leave the region dry by afternoon, with sunny spells more likely later. Cold with light winds. Widespread frost overnight. Maximum temperature 4 °C.
Updated: 1517 on Mon 11 Feb 2013
So just maybe weatherpro app is correct