This table contains hourly elements for the last 30 years measured at our synoptic station in Knock_Airport, Co Mayo. The file is updated monthly. Values for each hour may include (depending on the station): Precipitation Amount (mm); Air Temperature (°C); Wet Bulb Air Temperature (°C); Dew Point Air Temperature (°C); Vapour Pressure (hpa); Relative Humidity (%); Mean Sea Level Pressure (hPa); Mean Hourly Wind Speed (kt); Predominant Hourly wind Direction (kt); Synop Code Present Weather; Synop Code Past Weather; Sunshine duration (hours); Visibility (m); Cloud Ceiling Height (100s feet); Cloud Amount (octa).