The weather files with reference to the 2020s will cover the 30-year climatic period around that decade. This means that it covers the period 2010 to 2040, with the 2020s being the middle of the three decades (10’s/20’s/30’s).
Projects assessed under the applicable BREEAM standards should continue to use the 2020 weather files for mechanical ventilation, and the 2050 weather files for natural ventilation.
CIBSE weather files are available via the link below:
04 Jul 2024 - Clarified that 2020 and 2050 weather files are still valid for the applicable standards and guidance applied to all relevant UK standards. Applicability to international standards removed and link to CIBSE weather data added.
