Matthew Douglas, the observatory's chief weather observer, annotates a weather chart in his office at the Blue Hill Observatory and Science Center, Saturday, March 14, 2026, in Milton, Mass. (Laura Martin Agudelo/MIT Graduate Program in Science Writing via AP)

A cyclist rides up a road leading to the Blue Hill Observatory and Science Center, with a view of downtown Boston in the background, Sunday, March 15, 2026, in Milton, Mass. (Laura Martin Agudelo/MIT Graduate Program in Science Writing via AP)

Matthew Douglas, the observatory's chief weather observer, reads temperature and humidity from the thermometers and a psychrometer outside the Blue Hill Observatory and Science Center, Friday, March 13, 2026, in Milton, Mass. (Laura Martin Agudelo/MIT Graduate Program in Science Writing via AP)

Amanda Joly reads a graph detailing wind data at the Blue Hill Observatory and Science Center, Saturday, March 14, 2026, in Milton, Mass. (Laura Martin Agudelo/MIT Graduate Program in Science Writing via AP)

Mercury barometers measure atmospheric pressure at the Blue Hill Observatory and Science Center, Saturday, March 14, 2026, in Milton, Mass. (Laura Martin Agudelo/MIT Graduate Program in Science Writing via AP)

Anemometers record wind speed and direction at the Blue Hill Observatory and Science Center, Friday, March 13, 2026, in Milton, Mass. (Laura Martin Agudelo/MIT Graduate Program in Science Writing via AP)

A Campbell-Stokes sunshine recorder operates at the Blue Hill Observatory and Science Center, Friday, March 13, 2026, in Milton, Mass. (Laura Martin Agudelo/MIT Graduate Program in Science Writing via AP)

A gauge indicates the wind speed and direction inside the Blue Hill Observatory and Science Center, Friday, March 13, 2026, in Milton, Mass. (Laura Martin Agudelo/MIT Graduate Program in Science Writing via AP)