Annual Count of Frost Days (annual number of days where the minimum daily temperature is below 0 °C), projections for a range of future warming levels from UKCP18. Provided on a 12km BNG grid.Frost days have large negative impacts on crops, transportation, and energy demand. While there is a general reduction in frost days across the country, different administrative regions of the UK show a variation in the magnitude of the projected decrease in the numbers of frost days. There is a steady rate of decrease in frost days per year with global mean warming in all UK regions. See also Icing Days, which is a similar metric but measures more severe cold weather impacts.This data contains a field for each warming level. They are named 'Frost Days', the warming level, and 'upper' 'median' or 'lower' as per the description below. E.g. 'Frost Days 2.5 median' is the median value for the 2.5°C projection. Decimal points are included in field aliases but not field names e.g. 'Frost Days 2.5 median' is 'FrostDays_25_median'. Data defaults to displaying 'Frost Days 2.0°C median' values, use 'change style' to display other values.The warming levels used are 1.5°C, 2.0°C, 2.5°C, 3.0°C, 4.0°C, and two baselines are also provided for 1981-2000 (corresponding to 0.51°C warming) and 2000-2017 (corresponding to 0.835°C warming).What is the data?The data is from the UKCP18 regional projections using the RCP8.5 scenario. Rather than giving projections for a specific date under different scenarios, one scenario is used and projections are given at the different warming levels. So this data shows the expected number of Frost Days should these warming levels be reached, at the time that the warming level is reached.For full details, see 'Future Changes to high impact weather in the UK'. HM Hanlon, D Bernie, G Carigi and JA Lowe. Climatic Change, 166, 50 (2021) https://doi.org/10.1007/s10584-021-03100-5What do the 'median', 'upper', and 'lower' values mean?This scenario is run as 12 separate ensemble members. To select which ensemble members to use, a single value was taken from each ensemble member - the mean of a 21yr period centred on the year the warming level was reached. They were then ranked in order from lowest to highest.The 'lower' fields are the second lowest ranked ensemble member.The 'higher' fields are the second highest ranked ensemble member.The 'median' fields are the median average of all ensemble members.This gives a median average value, and a spread of the ensemble members indicating the level of uncertainty in the projections.This dataset forms part of the Met Office’s Climate Data Portal service. This service is currently in Beta. We would like your help to further develop our service, please send us feedback via the site - https://climate-themetoffice.hub.arcgis.com/

Annual number of frost days (days where minimum temperature falls below 0C) averaged over 1991-2020, provided on a 2km BNG grid.This data contains a field for the average over the period, named 'Airfrost Days'.Data source:HadUK-Grid v1.1.0.0 (downloaded 11/03/2022)More about HadUK-Grid - https://www.metoffice.gov.uk/research/climate/maps-and-data/data/haduk-grid/haduk-grid This dataset forms part of the Met Office’s Climate Data Portal service. This service is currently in Beta. We would like your help to further develop our service, please send us feedback via the site - https://climate-themetoffice.hub.arcgis.com/