You can see our Shelf-Life policy on the relevant Support Page. It states “product must be stored in a suitable environment that is not subjected to extreme variations in temperature and humidity” – I think we would have to consider minus 45 degrees as being an extreme in relation to connector performance. But I can only confirm that we have not tested long-term storage at low temperatures. You might want to consider drying the product and storing in a vacuum sealed pack. It may also depend on how long you intend to store it before use. If you are referring to storage after the product has been assembled to a PCB, there is less risk as you are no longer expecting the product to solder after storage, or handling which might cause problems if the housing has gone brittle. I can only recommend that if this is a crucial factor, you will need to carry out specific testing to confirm its suitability.

Single row pin headers can be carefully snapped by hand. For both single and double row, you can also purchase a hand-cutting tool Z1022-00 – it was designed for 2.54mm pitch, but can work on 2mm. Or, you can use a fine slitting saw if you have access to cutting machinery – this will give the cleanest edge.