T.A. Cinco et al. / Atmospheric Research 145–146 (2014) 12–26 17 1.5 Anomaly (base yr 61-90) 1998, 1.0 Temperature Anomlay (0C) 1.0 5 years running mean 0.5 Linear (5 years running mean) 0.0 y = 0.0123x - 0.2933 -0.5 1950 1952 1954 1956 1958 1960 1962 1964 1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 -1.0 Year Fig. 2. Observed annual mean temperature anomalies in the Philippines during the period 1951–2010 compared with the 1961–1990 normal values. 1965, 1972, 1982, 1987, 1991, 1994, 1997, 2002, 2004, 2009 (1964, 1970, 1971, 1973, 1974, 1975, 1988, 1998, 1999, 2010). However, the temperature signal is often noted in the year following the onset of a warming phase and on this basis it would appear that 1972–1973, 1982–1983, 1986–1987, 1997–1998 and 2009–2010 are El Niño events detectable in the Philippines' temperature record. This suggests that not all recorded El Niño events produce a noticeable response in the Philippines' temperature records. According to the records, 1.5 Anomaly (base yr 61-90) 1998, 0.9 Temperature Anomlay (0C) 1.0 5 years running mean 0.5 Linear (5 years running mean) 0.0 y = 0.0078x - 0.2332 -0.5 1950 1952 1954 1956 1958 1960 1962 1964 1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 -1.0 Year Fig. 3. Observed mean annual maximum temperature anomalies in the Philippines during the period 1951–2010 compared with the 1961–1990 normal values.