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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.

51,613 Unbroken Days
141 Years of Data
2,500+ Youth/Year
Take Action· 2026

Ask Your Senator to Co-Sponsor Amendment 1002 to FY 2027 Budget

Ask your Massachusetts State Senator to co-sponsor Amendment 1002 in the FY2027 Senate Budget — a $100,000 earmark to sustain Blue Hill Observatory, filed by Senator Driscoll.

How We Serve the Community

Science, Education & Discovery

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

From the Observatory

Latest News & Research

  • May 26, 2026 April 2026 Weather Summary

    Monthly Climate Summary · April 2026 Warm and Dry on the Hill.Spring Arrived Quietly. April 2026 brought slightly above-normal temperatures and well…

  • May 26, 2026 Save the Record. 141 Years Cannot Be Replaced.

    Grassroots Campaign · 2026 Save the Record.141 Years Cannot Be Replaced. Blue Hill Observatory & Science Center is launching a grassroots campaign…

  • May 26, 2026 Take Action for Blue Hill Observatory

    Take Action · 2026 Help Protect the Observatory. Your Voice Matters. Our community has already delivered two remarkable victories in the Massachusetts…

  • May 26, 2026 New at the Observatory in May 2026

    News & Announcements · 2026 A New Chapter for Blue Hill Observatory. We have been busy. A redesigned website, a new café…

See all news →
Current Conditions

Great Blue Hill Today

May 26 · 1:24 PM EST

Blue Hill Observatory

Temperature 79.3°F
Wind SW 7 mph
Gust 15 mph
Humidity 46%
Pressure 30.018"
View full weather data →
Our Mission

The Last Best Independent Climate Record

As federal science funding erodes, Blue Hill Observatory stands at a crossroads. We hold North America's longest continuous weather record — data that NOAA, NASA, and leading universities rely on. That record doesn't maintain itself.

Trusted By
UNITED NATIONS NOAA NASA NATIONAL PARK SERVICE NATIONAL WEATHER SERVICE WORLD METEOROLOGICAL ORG. AM. METEOROLOGICAL SOCIETY MUSEUM OF SCIENCE