The pattern varies greatly across Europe.
Severe weather is rather rare, so that source of flight cancellation is less of a problem in Europe, except on very rare days with winter snow storms. However, industrial action by airlines (AZ especially) ATC (France regularly) or airport staff is somewhat more of a problem in Europe. Rarely a year goes by without some of these problems, which can affect traffic crossing through French airspace for example as much as local traffic. However, pressure on airports and on air space in Europe makes delay very common at LHR
especially. Most British airports have inadequate security staff to operate their present proceedures, so that flights are delayed due to crew and passengers being stuck in security lines. Dublin, for example has inadequate ground movement capability in the terminal area, leading to knock on delays caused from early morning departures running late. Some European low cost operators resort to cancellation as a near first option if they run into any difficulties due to weather, airport conditions or availability.