Table 3: Long-term daily (recorded at 9am GMT) meteorological data available in e-RA recorded at: Rothamsted from 1853; Woburn from 1928; Broom’s Barn from 1982.

From: The electronic Rothamsted Archive (e-RA), an online resource for data from the Rothamsted long-term experiments

Variable   Rothamsted, Harpenden, Hertfordshire 51.82N 0.37 W 128 m asl Woburn, Husband Crawley, Bedfordshire 52.02 N 0.62W 89 m asl Brooms Barn, Higham, Bury St Edmunds, Suffolk 52.27 N 0.57E 70 m asl
  Unit Start End date Start End date Start End date
Rainfall mm 1853 current 1928 current 1982 current
Rainfall 1/1000th acre gauge mm 1853 current        
Wind direction 0-360o 1853 current 1928 current 2012 current
Drainage from 20, 40 and 60-inch rain gauges Inches 1870 current        
Maximum temperature oC 1878 current 1928 current 1982 current
Minimum temperature oC 1878 current 1928 current 1982 current
Sunshine hours 1890 current 1928 current 1982 current
Grass minimum temperature oC 1909 current 1929 current 1982 current
Dew point (derived) oC 1915 current 1968 current 1982 current
Cloud cover Oktas 1915 2007 1928 1999    
Barometric pressure mb 1915 2003a 1928 1999a    
Wet bulb temperature oC 1915 2014 1928 2009 1982 2009
Dry bulb temperature oC 1915 current 1928 current 1982 current
Wind force/speed msec−1 1915/1960 current 1928/1968 current 2012 current
Visibility code 1923 2007 1928 1999    
Relative humidity (derived) % 1925 2014 1928 2009 1982 2009
Relative humidity (recorded) % 2014 current 2009 current 2009 current
Soil temperature under grass, various depths oC 1931 currenta 1928 currenta 2012 current
Soil temperature under bare soil, various depths oC 1931 current 1968 current 1982 current
Rainfall duration hours 1931 current 1988 1999    
Total solar radiationb MJ m−2 1931 current 1981 current 1982 current
Wind run km 1946 current 1968 current 1982 current
Vapour pressure (derived) mb 1946 current 1928 currenta 1982 2009
Days with hail occurring code 1960 2007a 1968 1999a    
Days with thunder occurring code 1960 2007a 1968 1999a    
Days with snow occurring code 1960 2007a 1968 1999a    
Depth of fresh snow mm 1960 1978 1968 1978    
Total depth of snow mm 1960 2007 1968 1999    
Days with fog occurring code 1960 1978 1968 1978    
Snow lying code 1960 1978 1968 1978    
State of ground code         1982 1996
Net solar radiation MJ m−2         1997 current
Daily met data for schools 6 variables 1990 current        
Monthly met data for schools 4 variables 1878 2013        
  1. a Data not measured for all years
  2. b J cm−2 at Rothamsted.