often a very rapid fall in temperature. ... temperature at Christchurch fell by 20°C, the synoptic .... according to time of day; from the climatology of Ridley (1987). ...... kat-7-. -. -- lonounou. -. -. ---. 5. -. --. -. -. I boczne. Io. 10 08 06 04 02 00 22 20 ...