Vibration is a fast killer of incandescent bulbs.

Is the one blowing on a more exposed corner?

There are coated bulbs for 'rough service' and other bulbs that contain better filament support.
The coated bulbs are not designed for vibration, but breakage of the glass.

Try a ceiling fan type bulb.

Verfiy that the lamp is really burned out. The fixture socket may be the problem. Sometimes the center contact point is deformed and not making good contact.

It is on an outside corner so perhaps the greater exposure is the problem. Would a ceiling fan type of bulb be suitable for outside use? I will also try the latest burned out bulb in another fixture to see what happens. Thanks very much to both of you for your suggestions.

Abbey

If you don't have them on a dimmer, photo control, or electronic timer switch, replace them with compact fluorescents. CFs withstand vibration and physical shock much better.

"If you don't have them on a dimmer, photo control, or electronic timer switch, replace them with compact fluorescents. CFs withstand vibration and physical shock much better."

Depending on your location the CFLs may have problems with cold weather.