Guidance and Science Reports

Demonstration Projects

A set of six project leaflets demonstrate how different sectors may use the new set of UK climate projections, UKCP18. They were led by sector specialists and were written for their sector, describing how existing methods/risk assessments can still be used and where new methods need to be developed to exploit the opportunities that the UKCP18 dataset brings.

Data availability, access and formats

Find out which datasets are available through the UKCP User Interface and CEDA Data Catalogue, how you can access them and their formats at Data availability, access and formats [1.5MB].


These brief documents provide a summary of the key characteristics and results available from the climate projections and observations for each of the main variables: Temperature, Precipitation, Weather types, Wind and Sea level & storm surge. You can also find a factsheet on the derived projections for RCP2.6 and 2 and 4 degree warming worlds.

What are RCPs?

A guide to Representative Concentration Pathways [259KB] and how the relate to UKCP18 climate projections.

Caveats and Limitations

Find out what you need to be aware of before using UKCP18 datasets in UKCP18 Guidance: Caveats and Limitations [787KB].

How to interpret UKCP18 data

Guidance to users on how to interpret the different plots available through the science reports and user interface.

How to use the different sets of Land Projections

There are three sets of projections available over UK land: probabilistic, global and regional.  This guidance document (How to use the different sets of Land Projections [1.8MB]) helps users to consider how to choose the set of projections that meets their needs.

How to Bias Correct UKCP18 data

The choice of whether to bias correct data and the method chosen can be very specific to the user application.  For this reason, UKCP18 projections are presented without additional bias correction.  This guide helps users to make informed choices about bias correction: How to Bias Correct UKCP18 data [809KB]

Science Overview

Provides the highlights from each of the components of UKCP18 including observations, projections over land and the marine projections. Read Science Overview [20MB].

Science Reports

Four science reports are available that provide headline messages, descriptions of the methods used, an evaluation of the underlying models as well as the future projections. They include the Land Projections Report [59MB], Marine Projections Report [5MB], Derived Projections Report [11MB] and the State of the UK Climate Report.

Technical Notes

In response to some user queries, we’ve also published a technical note [1.1MB] clarifying characteristics of the probabilistic projections data such as the clipping at the extremes ends of the distributions and non-zero sum of anomalies during the baseline period.


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