As a general rule, arrive at the airport no later than two hours before your domestic flight is scheduled to depart. This is somewhat later than the typical suggestion of three hours for an international flight.
Oxford: Annual Weather Averages. July is the hottest month in Oxford with an average temperature of 16Â°C (61Â°F) and the coldest is January at 4Â°C (39Â°F) with the most daily sunshine hours at 9 in June.
The average temperature in London, England in May is quite mild at 12.5 Â°C (54.5 Â°F). Afternoons can be very mild with average high temperatures reaching 17 Â°C (62.6 Â°F). Overnight temperatures are generally a little cool with an average low of 8 Â°C (46.4 Â°F). In May the range/ variation of daily average temperatures is 9 Â°C (16.2 Â°F). The weather in May is a little parched with occasional rain. A mere 46mm (1.8in) of water is dumped during on average 13 days. In May the heavens above London, England are reasonably fine with on balance a moderate 6:11 of bright sunshine daily. The shortest day is 14:48 long and the longest day is 16:15 long with an average length of 15:35.