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)

Matthew Douglas reads a record of atmospheric pressure 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)

Matthew Douglas holds a sun card, which shows the duration of sunlight for the previous 24 hours, 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)