T.A. Cinco et al. / Atmospheric Research 145–146 (2014) 12–26 19 Fig. 5. Trends in the frequency of days with minimum temperature in the Philippines (1951–2010) below the 1961–1990 mean 1st percentile (cold nights). trends for both an increase in hot days and decrease in cold nights. The stations at Alabat, Virac and Legaspi which are located on the Pacific coast within 200 km of one another, in an area known as the Bicol region, show a significant decrease in hot days which could be considered as a small cooling trend cluster. From approximately 8°N to 13°N there is a line of five stations on the Pacific coast (Catamaran, Hinatuan, Surigao, Catbalogan and Tacloban) which all exhibit statistically significant increase in hot days with the station at Tacloban showing a particularly high increase. Other than this, there does not appear to be a discernible national level spatial pattern for either cold day or hot night indices. A significant increase in hot days is also found at the station in Baguio and this was also the case in both the other reference studies which used data from this station in earlier observations of the same indicator (Griffiths et al., 2005; Manton et al., 2001). This station is also one of two stations (the other is Malaybalay) located in an upland area, both of which show large significant trend increases which perhaps provides an indication that elevation does not play an influential constraining role in temperature extreme indices. However, the recent urbanisation of most of the cities in which the stations used in this study are located means we must use caution when considering these results as definitive.