1854 - Ongoing Met Office VOS Global Marine Meteorological Observations dataset https://portal.medin.org.uk/portal/start.php?tpc=010_f767f8a48495a86693ccf55d6c8bb03b Meteorological observations originating from voluntary observing ships produced routinely for weather forecasting and as part of the long term climatological record. Observations are made manually from any given position on the ship's track/route. Measurements include date, time, position, mean sea level pressure, air temperature, dew-point temperature, wind speed, wind direction, sea surface temperature (SST), visibility, clouds, wind wave period and height, present weather, past weather, pressure tendency and swell direction, period and height. Due to the nature of this data there may often be gaps within the dataset. 18540105