Is this a brown recluse? It's on the outside of my window and only comes out at night and gone during the day.
the simple answer is no. Hard to get clear id but most probably a Garden Cross - which refers to the pattern on the body not that it's annoyed.
If you are in the UK and have not been to America recently then it's a low chance of meeting a BR and it would more than likely be in the house having hitched a ride in a bag - outside happily doing it's own thing points towards a native 'pider . Recluse are very plain with spindley spider legs
Cin J