... Your site must be very sheltered if you did not have air frosts
during the cold spell in mid-November; on 16th I recorded a screen
minimum of -5.8°C, and on 24th -5.0°C, only 20 km or so west of you.
Could you tell us a little of your instrumentation and exposure
perhaps?

Stephen Burt
Stratfield Mortimer, Berkshire