Pendulum clocks generally go fast in winter and slow in summer.Why ?

Explanation

In summer due to increase in temperatureof atmosphere length of pendulum will increase .
Time period of pendulum `T =2pi sqrt((l)/(g)) T prop sqrt l` . So it will make less number of oscillations per day. So clock will run slowly in summer.
In winter temperature of atmosphere decreases. So length of pendulum decreases.
Hence time period of oscillation will also decrease . As a result pendulum will make more oscillations per day clocks will run fast in winter .