This table contains hourly elements for the last 30 years measured at our synoptic station in Birr, Co Offaly. 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).