Dear ... (твой друг) ,
It was good of you to think of writing to me, and I appreciate it very much.
I am indeed keeping well and am enjoying comparative leisure. I try to divide my time about equally between reading and recreation.
The weather here in ... (твой город) has been rather changeable lately. In the morning the sun shines warmly, but by noon the sky clouds over and we usually have a shower. Sometimes a storm blows up, but it never lasts very long.
It must be very hot now in ...(город), so take care of yourself.
Best regards.
Your friend