Daily Relative Humidity

Relative humidity is a measure of the amount of moisture in the air presented as a percentage of the maximum amount of moisture that air can hold at its current temperature. Shifting patterns of relative humidity, as projected by the Met Office Hadley Centre climate models, can influence indoor air quality conditions, with consequential impacts to occupant health. To help illustrate these patterns, the average annual relative humidity (%) is mapped for the average year in the time period for the 50th and 95th percentile models out of the 12-model suite. Time periods are baseline (1980-2000), 2030 (2021-2040), and 2070 (2061-2080). County-level results represent an area-weighted-average of the results for each climate data grid within the county.

Additional information is available here: Wales Housing Climate Analysis Additional Information

Accompanying maps in this series can be found here:

Climate Projections consisting of Daily Maximum Temperature, Annual Precipitation, Daily Relative Humidity and Daily Specific Humidity

Indoor Conditions results consisting of Indoor Air Quality and Overheating

Building Fabric degradation results consisting of Solar Insolation, Precipitation and Relative Humidity

Case Studies for four representative towns and cities illustrate results at a resolution of 2.2 km, giving insight into the variation that is projected geographically across each area:

Aberystwyth consisting of Climate, Indoor and Fabric

Cardiff consisting of Climate, Indoor and Fabric

Swansea consisting of Climate, Indoor and Fabric

Wrexham consisting of Climate, Indoor and Fabric

For a better understanding of the impact of summertime overheating on houses that have been highly insulated and suggestions on approaches to tackling them go to: Considering summertime overheating in highly insulated homes: factsheet | GOV.WALES

For a better understanding of the impact of summertime overheating on post 1985 properties (including older buildings converted into flats) and suggestions on approaches to tackling them go to: Considering summertime overheating in post 1985 properties (including older buildings converted into flats): factsheet | GOV.WALES

For a better understanding of the impact of summertime relative humidity in older properties and suggestions on approaches to tackling them go to: Considering summertime relative humidity in older properties: factsheet | GOV.WALES

For a better understanding of the maintenance, repair and adaptation priorities of older, traditional properties under a changing climate, go to: Considering repair, maintenance and adaptation priorities for older properties: factsheet | GOV.WALES