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in temperature and humidity. Air masses are separated by transition zones or boundaries that may be more sharply defined - these are called fronts. Air masses and weather fronts (Factsheet 10) 11. Interpreting weather charts On a weather chart, lines joining places with equal sea-level pressures are called

day. Mon Tue Wed Thu Fri Sat Sun Monthly atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for March 2024 for the UK and north Atlantic, based on the ERA5 reanalysis (Hersbach et al, 2019), both as actual values and as an anomaly relative

level pressure These charts show the monthly mean sea level pressure for April 2024 for the UK and north Atlantic, based on the ERA5 reanalysis (Hersbach et al, 2019), both as actual values and as an anomaly relative to the April long term average. These charts provide an indication of the weather

of February 2023 as daily totals. The daily rainfall is the total from 0900UTC on the day in question to 0900UTC the following day. Mon Tue Wed Thu Fri Sat Sun Monthly atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for February 2023 for the UK

the following day. Mon Tue Wed Thu Fri Sat Sun Monthly atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for September 2023 for the UK and north Atlantic, based on the ERA5 reanalysis (Hersbach et al, 2019), both as actual values and as an anomaly

atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for July 2024 for the UK and north Atlantic, based on the ERA5 reanalysis (Hersbach et al, 2019), both as actual values and as an anomaly relative to the July long term average. These charts provide

as daily totals. The daily rainfall is the total from 0900UTC on the day in question to 0900UTC the following day. Mon Tue Wed Thu Fri Sat Sun Monthly atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for February 2024 for the UK and north Atlantic

atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for January 2024 for the UK and north Atlantic, based on the ERA5 reanalysis (Hersbach et al, 2019), both as actual values and as an anomaly relative to the January long term average. These charts provide

on the day in question to 0900UTC the following day. Mon Tue Wed Thu Fri Sat Sun Monthly atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for June 2024 for the UK and north Atlantic, based on the ERA5 reanalysis (Hersbach et al, 2019), both as actual

0900UTC on the day in question to 0900UTC the following day. Mon Tue Wed Thu Fri Sat Sun Monthly atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for January 2024 for the UK and north Atlantic, based on the ERA5 reanalysis (Hersbach et al, 2019