[gosub100]

This is amazing yet again that they can ingest rain and snow so the inside can be, what, close to 3000F yet you can come into land in Minneapolis when it's -30F and everything Just Works. Imagine how different aviation would be if in an alternate universe we had modern jet engines but under no circumstances could they ingest water?

[osigurdson]

Note that at cruising altitude it would be more like -80F. The engine would be more efficient at sea level at -30F as the mass flow rate would be higher. Ingesting water vapour actually improves things for the same reason. The downside is it can cause corrosion over time.