WIKI
Operating temperature
Electrical and mechanical devices used in military and aerospace applications must endure greater environmental variability, including temperature range.

For example, resistors are manufactured in several grades:
Commercial grade: 0 °C to 70 °C (sometimes −10 °C to 70 °C)
Industrial grade: −40 °C to 85 °C (sometimes −25 °C to 85 °C)
Military grade: −55 °C to 125 °C (sometimes -65 °C to 175 °C)