When I was growing up (in Luton), 70ºF was
commonly and conventionally regarded as the beginning
of "warm" weather. Nowadays I find anything above
21ºC uncomfortably warm ... but that's a different story,
and not where I want to go here.

20 minutes with the old record books produced the
following statistic - the longest period of consecutive
days each summer with a maximum of at least
21ºC (i.e. 70ºF) ... the earlier years are taken from
the official climat. station located about 400m from
our back garden where the rest of the readings were
taken:

1954 5
1955 13
1956 4
1957 12
1958 6
1959 12
1960 7
1961 10
1962 3
1963 7
1964 20
1965 10
1966 6
1967 13
1968 5
1969 13
1970 9
1971 10
1972 9
1973 12
1974 4
1975 27
1976 25
1977 7
1978 9
1979 7
1980 8
1981 10
1982 12
1983 18
1984 24
1985 6
1986 10
1987 14
1988 6
1989 17
1990 26
1991 12
1992 14
1993 8
1994 21
1995 23
1996 8
1997 20
1998 9
1999 19
2000 14
2001 15
2002 10
2003 23
2004 31 unfinished

Philip Eden
Luton 113m