Keeping all things constant, the output voltage decreases as the temperature increases. There is a significant drop-off at temperatures higher than 150C. Other factors effecting output voltage include load current and operating frequency.
Other hyrid families exhibit the same phenomena. The actual output voltage varies depending partly on the number of stages and input voltage. Other factors include operating frequency, output current, and type of load.
MVM302P08 High Temp Data
MVM202P06 High Temp Data
MVM402P10 High Temp Data