Climate

Warmer Temperatures

• Current climate models project that Colorado will warm by 2.5°F by 2025 and 4°F by 2050. Summers are likely to warm more than winters.
• Warmer temperatures will affect evaporation rates in our rivers, streams and reservoirs, perhaps making less water available for beneficial use.

Seasonal Precipitation Shifts

• A projected seasonal shift in precipitation may result in more mid-winter precipitation throughout the state and, in some areas, a decrease in late spring and summer precipitation.
• Lower elevation snowpack (below 8200 ft.) is likely to decline, with modest declines projected for high elevation snowpack (above 8200 ft.).
• The timing of runoff is projected to shift earlier in the spring, which may reduce late summer stream flows. Runoff timing changes will likely occur regardless of changes in precipitation.

The Technical Update to the Water Plan, released in July 2019, embeds considerations of climate change in our state's future water supply study for the first time. Three of the five planning scenarios examined in the study include assumptions related to a hotter and drier future climate (scenarios titled: Cooperative Growth, Adaptive Innovation, and Hot Growth). The other two planning scenarios (Business as Usual and Weak Economy) assume similar climate conditions and variability to the observed conditions of the 20th century compared to historical natural flows for the period 1950–2013). Projections of future climate conditions were not a part of previous statewide supply studies (e.g. SWSI 2010) and can have a significant influence on hydrology, water use, and estimated supply-demand gaps.

A detailed explanation of the methodology can be found in Volume 2 of the Tech Update. More detailed explanations of climate impacts around Colorado can be found in several documents such as the Colorado Climate Plan (2018), Colorado Water Plan (2022), Colorado River State of the Science Report (2020) and the foundational work of the multi-phase Colorado River Water Availability Study (2019).

• Colorado Climate Change Vulnerability Study: Western Water Assessment, in collaboration with Colorado State University, conducted a broad study of climate vulnerability for the state of Colorado with assistance and guidance from CWCB. Drawing from existing data and peer-reviewed research, the study summarizes the key challenges facing seven sectors: ecosystems, water, agriculture, energy, transportation, outdoor recreation and tourism, and public health. It also details current adaptive capacity and potential strategies in those sectors to meet future climate challenges.
• The Colorado Climate Preparedness Project: The project provides a catalog of climate impacts and adaptation activities and options in five climate sensitive sectors in the state: water, wildlife, ecosystems and forests, electricity, agriculture and outdoor recreation. An associated online database is also available.
• The Colorado River Water Availability Study: The study aims to find out how much water from the Colorado River Basin System is available to meet Colorado’s current and future water needs.
• The Joint Front Range Climate Change Vulnerability Study: The study provided the education, tools and methodology necessary to examine the possible effects of climate change on several common watersheds.
• Drought Planning: The CWCB encourages and assists communities in preparing and implementing drought mitigation plans, monitors drought impacts and educates water providers about drought planning.
• The Colorado Drought Mitigation and Response Plan: The plan provides a road map to assist the state with reducing the impact of water shortages over the short and long-term. The plan includes a mechanism for drought monitoring, impact assessment, response to emergency drought problems and mitigation of long-term drought impacts.
• The Colorado Climate Action Plan: The plan sets specific, achievable goals for Coloradans to help address global warming.
• 2008 Colorado Climate Change: A Synthesis to Support Water Resource Management and Adaptation 
• Climate Change in Colorado Fact Sheet
• Colorado's Forests & Climate Change

• Colorado Climate Plan
  (Exec Summary, Full PDF 2018)


• Colorado Resiliency Framework
  (Full PDF, 2015)
   
• Colorado River State of the Science Report
  (Full PDF, 2020)


• Colorado River Water Availability Study, Phase II
  (Full PDF, 2019)


• Climate Change in Colorado Report
  (Full PDF, Exec Summary, 2014)


• Climate Definitions