ALT An original handwritten page from Blue Hill Observatory's September 1938 meteorological journal. Entries for September 21 document the Great New England Hurricane as it struck the Observatory, including rapidly increasing winds, equipment damage, falling trees and other storm impacts.

ALT View from the rooftop of the Blue Hill Weather Observatory on the morning of September 11, 2026. The sun shines through a sky filled with thin, streaked and layered clouds above the wooded landscape. Observatory instruments and part of the communications tower are visible along the right side of the image.

ALT Blue Hill Observatory’s handwritten surface weather observation record from September 11, 2001. The historic form contains hourly temperature, wind, cloud, and weather observations recorded throughout the day, along with the daily summary showing a high of 79°F, a low of 60°F, no precipitation, and 94% of possible sunshine.

ALT View from Blue Hill Observatory overlooking a forested landscape beneath a clear blue sky. The bright sun shines overhead, with Ponkapoag Pond visible in the distance and hints of early autumn color beginning to appear among the trees.