HadUK-Grid Datasets
An overview of the available datasets.
The HadUK-Grid gridded and regional land surface climate observation datasets are provided under open government licence.
Variables and periods available:
| Climate Variable | id | Definition | Start Year |
|---|---|---|---|
| Maximum air temperature | tasmax | Maximum air temperature measured between 0900 UTC on day D and 0900 UTC on day D+1 (oC) | 1960 |
| Minimum air temperature | tasmin | Minimum air temperature measured between 0900 UTC on day D-1 and 0900 UTC on day D (oC) | 1960 |
| Precipitation | rainfall | Total precipitation amount measured between 0900 UTC on day D and 0900 on day D+1 (mm) | 1891 |
| Climate Variable | id | Definition | Start year |
|---|---|---|---|
| Maximum air temperature | tasmax | Average of daily maximum air temperature over the calendar month, season or year (oC) | 1884 |
| Minimum air temperature | tasmin | Average of daily minimum air temperature over the calendar month, season or year (oC) | 1884 |
| Mean air temperature | tas | Average of daily mean air temperature over the calendar month, season or year (oC) | 1884 |
| Precipitation | rainfall | Total precipitation amount over the calendar month, season or year (mm) | 1836 |
| Sunshine duration | sun | Duration of bright sunshine during the month, season or year (hours) | 1910 |
| Mean wind speed at 10 m | sfcWind | Average of hourly mean wind speed at a height of 10 m above ground level over the month, season or year (knots) | 1969 |
| Mean sea level pressure | psl | Average of hourly (or 3-hourly) mean sea level pressure over the month, season or year (hPa) | 1961 |
| Mean relative humidity | hurs | Average of hourly (or 3-hourly) relative humidity over the month, season or year (%) | 1961 |
| Mean vapour pressure | pv | Average of hourly (or 3-hourly) vapour pressure over the month, season or year (hPa) | 1961 |
| Days of ground frost | groundfrost | Count of days when the grass minimum temperature is below 0oC (days) | 1961 |
| Days of snow lying | snowLying | Count of days with greater than 50% of the ground covered by snow at 0900 UTC (days) | 1971 |
| Period | Description | Notes |
|---|---|---|
| 1961-1990 | Standard reference climatology period providing monthly, seasonal and annual averages for 1961 to 1990 | Not available for snowLying or sfcWind |
| 1981-2010 | Standard reference climatology period providing monthly, seasonal and annual averages for 1981 to 2010 | |
| 1991-2020 | Standard reference climatology period providing monthly, seasonal and annual averages for 1991 to 2020 | |
| 1981-2000 | 20 year reference climatology period provided for use with UKCP18 products |
Resolutions and domains available
The HadUK-Grid dataset is produced on a 1km x 1km grid resolution on the Ordnance Survey's National Grid.
To facilitate comparison of the observational dataset with the UKCP18 climate projections the dataset is also provided at 12km, 25km and 60km resolution. All the gridded datasets use the same grid projection. The re-gridding is conducted through averaging of all 1km grid points that fall within each of the coarser resolution grid cells.
Area averages are also produced based on averaging the 1km grid across a set of geographical regions to provide spatial statistics for country, administrative regions and river basins. The details of these areas can be found on UKCP technical notes page and the associated shapefiles.