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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.

51,597 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

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Current Conditions

Great Blue Hill Today

May 10 · 6:44 AM EST

Blue Hill Observatory

Temperature 50.8°F
Wind SSW 7 mph
Gust 14 mph
Humidity 97%
Pressure 29.868"
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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