Climate

Outdoors Indoors Differences
13°C °C -13°C
1011mb mb -1011mb

Approximate ΔP (Stack Effect) = -2.53Pa

Data Sources:

BBC Weather for Bicester area (http://open.live.bbc.co.uk/weather/feeds/en/2655729/observations.rss)
Locally gathered from a BMP085 sensor (although made obsolete by the BMP180)