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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.

51,572 Unbroken Days
141 Years of Data
2,500+ Youth/Year
Earth Day · April 18, 2026

Climb for a Better Tomorrow

Join hundreds of community members ascending Great Blue Hill this Earth Day. Every step supports climate education for the next generation.

🧗 5th Annual Climb — Earth Day, April 18, 2026

Register now →
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

  • 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.

  • Mar 24, 2026 From April Break to August: Programs for Every Young Explorer

    From April break through the end of August, Blue Hill Observatory has programs for students of all ages — from week-long nature adventures for elementary schoolers to an intensive meteorology career program for high schoolers. Here's everything coming up this spring and summer.

  • Mar 24, 2026 Earth Day Climb Event. Same Hill. Same Mission. A Bigger Invitation.

    On April 18th, hundreds of community members will ascend Great Blue Hill together for one of Greater Boston's most beloved Earth Day traditions.

See all news →
Current Conditions

Great Blue Hill Today

· 2:00 AM

Blue Hill Observatory

Temperature
Wind — WSW 13 G 18 mph
Gust
Humidity 91%
Pressure 29.842" (1010.6 mb)
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