A "new" database has been made available by the EU, from the Copernicus project (free access, login required).

UTCI and T_{MRT} , August 31st, 2018
This dataset provides a complete historical reconstruction of the UTCI (Universal Thermal Confort Index, a thermal comfort index as well as the MRT (Mean Radiant Temperature, essential for the thermal comfortestimation), from 1979 up to today. Those parameters are computed by the ERA5-HEAT (Humen thErmAl comforT) model. It is based upon a reanalysis of observations from across the world, to provide a globally complete and consistent description of the Earth’s climate and its evolution in recent decades.
Technical data:
DATA DESCRIPTION |
Data type |
Gridded |
Horizontal coverage |
Global except for Antarctica (90N-60S, 180W-180E) |
Horizontal resolution |
0.25° x 0.25° |
Vertical resolution |
Surface level |
Temporal coverage |
1979-01-01 to near real time for the most recent version. |
Temporal resolution |
Hourly data |
File format |
NetCDF |
Conventions |
Climate and Forecast (CF) Metadata Convention v1.6 |
Versions |
UTCI v1.0 |
Update frequency |
Intermediate dataset updated daily in near real time, Consolidated dataset monthly updates with 2-3 month delay behind real time. |