To be fair I think the airfield is in a frost pocket. It’s usually a couple of degrees colder than here (Didcot). But in the end Oxon tends to be relatively cold because it’s a relatively long way from the sea and because being low-lying most of it isn’t very windy.
The weatherpeople were saying yesterday that, depending on how cold it is today, this could turn out to be the coldest February since 1996 “or even 1986”. We lived in a damp draughty uninsulated rented place in Kidlington in 1986. One cold night ice formed on the glass of water on Mrs VB’s bedside table. The water in the helium gasometer at the university Physics Dept froze despite having a 4kW heater running in it. And IIRC the mercury hit -20C in Oxford itself ! A few years earlier I remember being snowed in on the Banbury Rd and people skiing into and out of town. The water in a friend’s toilet bowl froze. We have indeed become snowflakes since then.