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The AMS is a global community committed to advancing weather, water, and climate science and service.

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We advance understanding through high-impact, peer-reviewed scientific publications—including the Bulletin of the American Meteorological Society (BAMS).


We bring together atmospheric scientists, professionals, students, authors, educators, researchers, and weather enthusiasts from around the world to share and collaborate.


We offer certification programs, online learning, and other professional development opportunities so that our members can learn, grow, and succeed.


We help educators and policy-makers bring the very latest weather, water, and climate science to bear on our nation’s future… and the world’s.

Richard Clark
AMS President

For 35 years I’ve been a proud member of the AMS. My life, personal and professional, has been enriched by this community with whom I share my passion, and I relish the endearing friendships that I’ve made with so many of its members. Over the years, I’ve chaperoned several hundreds of undergraduate meteorology students to the Annual Meetings. It is satisfying to know that so many have continued on as active members and leaders, giving to this Society as volunteers and, in return, gaining from the historic legacy that they inherit and promising future that they will help forge

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Glossary Term of the Week

growing degree-day

A heat index that relates the development of plants, insects, and disease organisms to environmental air temperature.

GDD is calculated by subtracting a base temperature from the daily mean temperature and GDD values less than zero are set to zero. The summation over time is related to development of plants, insects, and disease organisms. The reference temperature (base temperature) below which development either slows or stops is species dependent. For example, cool season plants (canning pea, spring wheat, etc.): base temperature is 40°F (5°C); warm season plants (sweet corn, green bean, etc.): base temperature is 50°F (10°C); and very warm season plants (cotton, okra, etc.): base temperature is 60°F (15°C).

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