Climate Impacts Research

Urban Climate Change Research Network

Cover of ARC3.2 report

The Urban Climate Change Research Network (UCCRN) is a consortium dedicated to the analysis of climate change mitigation, adaptation and energy issues from an urban perspective.

At COP21, the UCCRN released the "Summary for City Leaders" of the Second UCCRN Assessment Report on Climate Change and Cities (ARC3.2) at the Climate Summit for Local Leaders in Paris City Hall on December 4, 2015.

UCCRN is dedicated to providing the information that city leaders–from government, the private sector, non-governmental organizations, and the community—need in order to assess current and future risks, make choices that enhance resilience to climate change and climate extremes, and take actions to reduce greenhouse gas emissions. The ARC3.2 Summary for City Leaders provides a broad synthesis of the latest scientific research on climate change and cities. It presents the majors findings and key messages on urban climate science, disasters and risk, urban planning and design, mitigation and adaptation, equity and environmental justice, economics, finance, and the private sector, urban ecosystems, urban coastal zones, public health, housing and informal settlements, energy, water, transportation, solid waste, and governance.

The report included Climate Observations and Projections for 100 ARC3.2 Cities

Global map of projected temperature change

Projected temperature change in the 2050s and ARC3.2 Cities. Temperature change projection is mean of 35 global climate models (GCMs) and one representative concentration pathway (RCP4.5). Colors represent mean annual temperature change for a mid-range scenario (RCP 4.5), from CMIP5 models (2040-2069 average minus 1971-2000 average).

  • Temperatures are already rising in cities around the world due to both climate change and the urban heat island effect. Mean annual temperatures in 39 ARC3.2 cities have increased at a rate of 0.12 to 0.45°C per decade over the 1961 to 2010 time period.
  • Mean annual temperatures in the 100 ARC3.2 cities around the world are projected to increase by 0.7 to 1.5°C by the 2020s, 1.3 to 3.0°C by the 2050s, and 1.7 to 4.9°C by the 2080s (Figure 2).
  • Mean annual precipitation in the 100 ARC3.2 cities around the world is projected to change by -7 to +10% by the 2020s, -9 to +15% by the 2050s, and -11 to +21% by the 2080s.
  • Sea level in the 52 ARC3.2 coastal cities is projected to rise 4 to 19 cm by the 2020s; 15 to 60 cm by the 2050s, and 22 to 124 cm by the 2080s.

Further Information

+ UCCRN Website

+ Download ARC3.2 Summary for City Leaders

+ Return To Climate Impacts homepage