FACS-GMU Urban Heat Island Mapping Project

On Thursday, July 16, 2026, one of the hottest days of the year, over 80 volunteers(opens in new tab) measured weather data across Northern Virginia. Using our  Volunteer Guide, each team mounted a weather-tracking device to the roof of their vehicle before driving pre-assigned routes during the morning, afternoon, and evening to measure temperature and humidity across the region.

Measurement Day is part of phase one of FACS’ Urban Heat Island Mapping Project, in partnership with George Mason University’s Virginia Climate Center.

The results of the study will be a much more localized understanding of Northern Virginia’s heat landscape than can be provided by traditional weather stations alone.

The information collected through this project can help local governments, community organizations, local businesses and residents identify where investments can make the greatest difference. Data can help inform decisions about tree planting, shade structures, parks and green spaces, destination-based cooling centers, transportation infrastructure, building design, and other strategies for reducing the impacts of extreme heat.

1. Because of the strong community interest in this project, our annual Climate Crisis Forum in October will focus on urban heat islands in Northern Virginia and continue building on this work. You can grab a ticket on our Climate Crisis Forum webpage.
2. Researchers, including students, at George Mason University are currently analyzing the data collected to create heat maps of the region. We will continue sharing updates and findings, including how this data can support local planning, public health, and climate resilience.