Five children, two boys and three girls, with the girls wearing white scarves, sit on the pavement outside in front of a large window.
There is snow outside.
People wear scarves when there is not snow outside.
Just because five children, two boys and three girls, with the girls wearing white scarves, sit on the pavement outside in front of a large window, doesn't mean there is snow outside.
You can not infer there is snow.