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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.

51,596 Unbroken Days
141 Years of Data
2,500+ Youth/Year
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

  • Apr 22, 2026 141 Years of Watching the Sky. Help Us Never Stop.

    On this Earth Day, we invite you to invest in the climate record that cannot be replaced — and the community that sustains it.

  • Apr 22, 2026 Climb for a Better Tomorrow: Thank You for Making It Unforgettable

    With full hearts, we extend our deepest thanks to the participants, sponsors, and volunteers who made the fifth annual Climb for a…

  • Mar 24, 2026 Meet Cheryl Cummings, Director of Strategic Partnerships

    Cheryl Cummings has spent more than two decades helping mission-driven organizations grow — building strategies, strengthening teams, and connecting people to causes worth believing in. For the past six years, she has brought that experience to bear at Blue Hill Observatory & Science Center, where she serves as Director of Strategic Partnerships.

  • Mar 24, 2026 Your Legacy at the Observatory

    By including Blue Hill Observatory in your will or estate plan, you help ensure that this extraordinary scientific and historic legacy continues for generations to come — that the climate record keeps growing, that students keep climbing this hill, and that the doors of the Observatory stay open to scientists, educators, and the curious public long into the future.

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Current Conditions

Great Blue Hill Today

May 9 · 6:10 AM EST

Blue Hill Observatory

Temperature 49°F
Wind SSW 1 mph
Gust 2 mph
Humidity 51%
Pressure 29.917"
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