Glacier National Park
60 Workable. Moon up after 12:55am, 50% cloud.
Why
| Cloud | 35 | 50% cloud, mostly high cirrus, thin to the eye but ruinous for photography |
| Moon | 88 | last quarter at 34%, rises 12:55am, dark before that |
| Darkness | 100 | 10h37m of astronomical darkness, 7:00pm–5:37am |
| Transparency | 100 | Dewpoint spread 15.9°C, dry and steady air |
| Targets | 0 | Orionids running, about 0 an hour at best |