HI Amal,
Juniper does not have an industrial L2 switch or outdoor switches.
A few alternative options:
* Look at the ACX1100 which is temperature hardened without fans but requires an outdoor rack. It's a router but can do most of the L2 features needed
* ACX500-O has 3 copper and 3 SFP ports in a outdoor casing... but has a high price due to built-in GPS reciever.