I teach F1 and 2 and we have to provide outdoor activities whatever the weather. The kids all bring wellies and waterproofs and love playing out in the puddles (even though sometimes us teachers don't).
DS is in Y2 further up school and on rainy days comes out hyper after being kept in all day, jumps in every puddle on the way home and goes straight out to play in the garden.
If we have to allow our younger more delicate little darlings to play in the rain/snow/wind, then why can't the older kids. I'd happily provide waterproofs, Y2s can dress much more quickly than F! and 2s. Are the KS1&2 teachers just nesh? (ducks and hides) 