flatout wrote:In answer to the OP – No. And it is not the temperature at your departure time that is the criteria.
The best guide still remains the application of your own ‘common sense’ based on knowledge of your own cycling manor, habits and routes (gritted, hills and dips, water run-off, tree overhangs, urban or countryside, burst water mains, tyre selection, weight of bike and rider, overnight lows, recent rainfall, time of day, sunshine or overcast, vehicular traffic density, etc. etc.).
If in doubt leave it out.
How does leaving the bike outside help?!?