<P> The temperature records in England are continuous back to the mid 17th century . The Central England temperature (CET) record is the oldest in the world, and is a compound source of cross-correlated records from several locations in central England . Precipitation records date back to the eighteenth century and the modern England and Wales Precipitation series begins in 1766 . </P> <P> A detailed narrative account of the weather of every year from 1913 to 1942, with photographs of plants taken on the same day in each of those years, may be found in Willis (1944). </P> <P> As with many parts of the world, over the last century the United Kingdom has reported a warming trend in temperatures . While some of this may be due to a recovery from the cooler period of climate mid 20th century (particularly the 1960s) the last 20 years has nonetheless seen an unprecedented level of warm weather . This rise in temperatures is illustrated by the most recent dataset (1981--2010) for Belfast and Cambridge Botanical Gardens, and the same data 50 years previous (1931--1960). </P> <Table> <Tr> <Th_colspan="14"> (hide) Climate data for Belfast, 1931 - 1960 </Th> </Tr> <Tr> <Th> Month </Th> <Th> Jan </Th> <Th> Feb </Th> <Th> Mar </Th> <Th> Apr </Th> <Th> May </Th> <Th> Jun </Th> <Th> Jul </Th> <Th> Aug </Th> <Th> Sep </Th> <Th> Oct </Th> <Th> Nov </Th> <Th> Dec </Th> <Th> Year </Th> </Tr> <Tr> <Th> Average high ° C (° F) </Th> <Td> 6.0 (42.8) </Td> <Td> 6.8 (44.2) </Td> <Td> 9.2 (48.6) </Td> <Td> 11.8 (53.2) </Td> <Td> 14.9 (58.8) </Td> <Td> 17.5 (63.5) </Td> <Td> 18.4 (65.1) </Td> <Td> 18.3 (64.9) </Td> <Td> 16.1 (61) </Td> <Td> 12.6 (54.7) </Td> <Td> 9.1 (48.4) </Td> <Td> 6.9 (44.4) </Td> <Td> 12.3 (54.13) </Td> </Tr> <Tr> <Th> Average low ° C (° F) </Th> <Td> 1.5 (34.7) </Td> <Td> 1.5 (34.7) </Td> <Td> 2.7 (36.9) </Td> <Td> 3.9 (39) </Td> <Td> 6.1 (43) </Td> <Td> 9.2 (48.6) </Td> <Td> 11.0 (51.8) </Td> <Td> 10.7 (51.3) </Td> <Td> 9.2 (48.6) </Td> <Td> 6.8 (44.2) </Td> <Td> 4.1 (39.4) </Td> <Td> 2.9 (37.2) </Td> <Td> 5.8 (42.45) </Td> </Tr> <Tr> <Td_colspan="14"> Source: Stadtklima </Td> </Tr> </Table>

What are the 4 climatic zones of the uk