A provisional long mean air temperature series for Armagh observatory

Abstract

Two long mean surface air temperature series are presented for Armagh Observatory; one based on twice daily ‘spot’ temperature readings, 1796–1882, and the other on daily maximum and minimum temperatures, 1844–1992. Our data confirm the correlation of temperature with solar cycle length, first suggested by Friis-Christensen and Lassen (Science254, 698, 1991) and, for this site, extend their result a further 65 years, back to the end of the 18th century.