National Historic Landmark · Since 1885

North America's Oldest Continuous Weather Record

Every single day since February 1, 1885 — through wars, storms, and pandemics — someone has climbed Great Blue Hill and recorded the weather.

Support the Record Our Mission

51,780 Unbroken Days

141 Years of Data

2,500+ Youth/Year

How We Serve the Community

Science, Education & Discovery

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"The most homogeneous climate record in North America." — World Meteorological Organization

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Trusted By

NOAA NASA MIT WORLD METEOROLOGICAL ORG. NATIONAL PARK SERVICE AM. METEOROLOGICAL SOCIETY MUSEUM OF SCIENCE