About Us

Degree Day is an independent research provider specializing in extreme weather and climate change risk modeling. With deep subject matter expertise, we deliver science-based, data-driven research to help decision-makers navigate the complexities of managing current and future hazards.

15+

years of expertise

in physical climate science and impacts, engineering, and natural disaster policy

Past roles at:

Ramboll, Arup, WSP, CalEPA, NOAA, and Princeton University.

Who We Are

For over 15 years, Degree Day’s team has conducted research on climate and extreme weather impacts. We partner with businesses, engineers, utilities, asset managers, and governments to deliver original, data-driven risk insights. While climate data are central to our work, we integrate diverse information sources and expert judgment. Our hands-on, interdisciplinary approach ensures practical, focused solutions tailored to real-world challenges.

Our Approach

We believe that physical climate risks require expert navigation. Data alone will fail to drive meaningful action, as climate model outputs are inherently limited. That’s why we take a tailored, evidence-based approach, interweaving multiple sources of data, contextual knowledge, and expert judgement to provide organizations with a comprehensive understanding of risk and measurable risk management benefits.

We recognize that organizations face resource constraints. That’s why we are committed to clearly demonstrating the financial value of proactive risk management, ensuring our clients see measurable returns on their investments in weather and climate risk management services.

Our Research Values

Independent and science-based

Degree Day is committed to the highest standards of academic integrity and rigor. We operate free from external influence, ensuring our research remains objective, unembellished, and grounded in evidence.

Data-driven and interdisciplinary

Degree Day leverages rigorous data analysis and multidisciplinary perspectives to tackle complex climate challenges. By integrating diverse viewpoints, we develop practical, actionable solutions that address real-world needs.

Focused on client needs

Degree Day is dedicated to providing decision-relevant insights that help our clients navigate weather and climate risk management. Our goal is to ensure measurable returns on their investments, equipping them with the tools to manage both present and future risks effectively.

Harnessing the latest science and data for climate risk analysis that is transparent and tailored for your organization

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Our Team

D.J. Rasmussen, PhD

Founder and Principal

D.J. Rasmussen has provided expert guidance and conducted cutting-edge research on the technical, strategic, and policy challenges posed by climate risks for over 15 years. He is the founder of Degree Day LLC, a consultancy that supports businesses, engineers, utilities, asset managers, and governments integrate weather and climate intelligence into decision-making and risk management.

He has collaborated with Fortune 500 companies, data center operators, federal and state government agencies, utilities, and transit organizations to develop tailored strategies for managing extreme weather and climate-related risks and enhancing resilience.

Prior to founding Degree Day, he held roles at multinational engineering firms and was a research fellow at Princeton University and NOAA’s Geophysical Fluid Dynamics Laboratory — a pioneering institution in atmosphere-ocean climate modeling.

His expertise is reflected in numerous technical reports and peer-reviewed research published in leading scientific journals, including Science and Nature Climate Change. He received his PhD in Applied Climate Science, Impacts, and Policy from Princeton University.