Monthly mean air temperature

WAKKANAI   Station No:47401 Lat 45^o24.9'N  Lon  141^o40.7'E   (^oC)

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
1938	-5.2	-4.9	-0.6	4.7	9.5	11.6	17.9	22.2	16.5	10.7	3.3	-4.7	6.8
1939	-7.5	-6.6	-1.4	4.0	7.5	13.0	17.4	20.0	17.4	9.7	3.0	-2.5	6.2
1940	-6.0	-5.7	-0.5	3.5	8.5	11.0	16.6	19.7	15.6	10.4	3.7	-1.0	6.3
1941	-6.5	-5.8	-2.6	3.6	8.1	11.4	12.7	16.5	16.0	10.0	4.0	-2.9	5.4
1942	-7.8	-8.2	-0.8	3.5	7.1	12.0	17.4	18.4	15.7	10.5	2.5	-2.9	5.6
1943	-4.1	-6.1	-1.1	3.5	6.9	12.9	19.3	21.5	17.5	11.7	1.2	-3.6	6.6
1944	-7.7	-7.9	-2.2	1.7	8.9	13.7	19.0	21.3	16.6	10.8	1.3	-6.0	5.8
1945	-7.8	-6.9	-1.8	3.9	5.5	11.0	13.6	18.7	16.8	11.0	3.9	-4.8	5.3
1946	-6.5	-6.0	-3.3	4.5	7.6	14.9	18.2	22.2	16.9	11.5	4.4	-2.5	6.8
1947	-4.9	-5.5	-2.3	3.7	9.0	11.2	17.1	19.3	15.1	10.6	2.4	-4.6	5.9
1948	-2.7	-4.4	-0.2	6.0	10.7	12.2	16.2	22.0	16.9	11.1	4.2	-0.6	7.6
1949	-2.6	-2.8	-3.4	1.9	9.4	11.8	16.9	20.8	17.8	10.8	3.1	-3.8	6.7
1950	-5.7	-4.8	-1.3	4.0	9.2	14.6	19.3	22.6	16.8	9.0	3.0	-2.9	7.0
1951	-6.7	-6.5	-2.2	3.7	9.5	12.3	16.7	22.3	15.6	10.1	3.7	-0.3	6.5
1952	-5.7	-7.1	-2.4	3.8	8.3	13.1	16.4	19.7	17.0	11.3	0.9	-7.1	5.7
1953	-7.7	-7.3	-0.9	3.6	6.9	11.1	16.8	19.2	17.6	11.2	-0.6	-2.6	5.6
1954	-6.7	-4.1	-2.5	4.0	7.5	11.0	13.7	17.0	17.2	9.5	3.2	-1.8	5.7
1955	-6.4	-4.8	-1.3	4.7	7.0	12.7	20.3	19.5	15.5	10.6	3.6	-0.4	6.8
1956	-6.1	-4.6	-2.0	5.1	10.8	11.2	13.8	16.3	17.2	12.3	2.8	-2.6	6.2
1957	-3.9	-5.5	-2.9	4.4	9.3	10.9	17.1	18.2	15.5	11.1	5.4	-1.1	6.5
1958	-4.9	-4.9	-2.3	4.4	8.5	12.6	17.5	18.3	16.8	10.6	4.5	-0.5	6.7
1959	-7.3	-2.8	0.8	6.4	9.4	12.7	17.1	18.5	16.2	11.6	2.9	-3.9	6.8
1960	-7.2	-5.2	-1.4	3.5	7.7	10.8	15.9	20.8	18.1	9.7	3.3	-3.9	6.0
1961	-7.7	-5.3	-1.4	5.5	8.7	14.7	19.5	20.0	18.9	10.4	4.1	-1.3	7.2
1962	-4.2	-5.4	-2.5	6.7	10.0	12.9	16.8	17.7	16.6	9.9	2.6	-1.5	6.6
1963	-3.6	-3.7	0.1	5.0	10.4	12.4	16.8	17.1	15.6	10.7	4.3	-1.7	7.0
1964	-4.5	-7.7	-1.3	3.7	9.9	11.9	15.3	17.7	14.9	10.0	3.6	-1.9	6.0
1965	-4.1	-5.7	-2.8	3.2	9.1	13.3	15.2	18.8	15.8	11.4	2.1	-2.6	6.1
1966	-5.0	-5.5	-1.0	3.2	8.1	12.2	15.3	17.5	15.4	11.6	4.1	-4.4	6.0
1967	-6.8	-5.9	-0.7	4.5	10.0	11.4	16.4	20.5	15.5	11.0	1.8	-1.5	6.4
1968	-4.2	-4.7	1.9	5.7	8.9	14.5	17.3	18.1	15.9	9.1	5.3	-0.7	7.3
1969	-7.3	-7.5	-2.5	3.9	7.2	10.6	17.0	16.5	16.1	9.4	2.2	-5.4	5.0
1970	-6.6	-6.0	-4.2	4.6	10.4	12.9	17.4	19.2	16.8	10.5	4.3	-3.3	6.3
1971	-6.3	-6.4	-1.7	4.1	7.6	11.6	15.8	17.2	15.2	11.5	3.4	-2.2	5.8
1972	-5.3	-5.0	-0.6	5.9	9.4	12.8	16.8	20.4	15.7	10.9	1.9	-1.4	6.8
1973	-4.2	-5.3	-2.9	4.2	8.4	12.8	17.0	20.9	17.1	10.4	3.5	-1.9	6.7
1974	-2.6	-4.6	-2.1	4.0	8.4	11.8	16.8	18.8	16.5	10.1	1.9	-5.7	6.1
1975	-4.1	-6.1	-1.5	4.3	8.4	13.7	16.1	20.6	17.3	10.4	3.8	-3.8	6.6
1976	-4.6	-3.5	-1.4	4.0	8.9	11.9	17.5	17.6	15.7	10.2	1.3	-2.0	6.3
1977	-8.3	-7.1	-1.0	3.6	8.0	11.9	18.2	19.1	17.4	11.4	4.5	-1.8	6.3
1978	-6.7	-9.2	-1.6	4.3	9.2	13.5	20.6	21.3	17.4	9.6	3.4	-2.1	6.6
1979	-6.9	-4.5	-2.5	2.7	7.8	13.2	15.8	20.3	16.9	11.3	2.9	-0.1	6.4
1980	-5.4	-7.1	-1.9	1.9	7.8	12.9	15.9	16.5	16.0	10.0	4.3	-0.6	5.9
1981	-5.4	-6.3	-2.6	5.6	8.1	11.8	17.1	18.7	16.0	10.5	0.8	-0.6	6.1
1982	-5.6	-5.3	-0.6	3.7	9.0	11.9	16.9	21.0	17.5	11.4	4.3	-1.0	6.9
1983	-4.2	-7.6	-1.9	6.8	8.2	8.5	14.5	18.9	15.8	8.9	4.8	-2.1	5.9
1984	-4.9	-6.6	-3.3	2.9	7.9	15.5	19.5	20.5	16.6	9.2	2.3	-3.6	6.3
1985	-8.7	-4.8	-1.4	4.9	8.6	11.7	16.6	21.1	15.7	10.3	2.7	-4.2	6.0
1986	-7.2	-6.5	-2.4	4.6	8.4	11.2	14.4	19.6	16.8	9.1	2.1	-1.9	5.7
1987	-6.4	-5.6	-1.4	4.2	8.6	12.6	17.5	18.0	16.4	11.1	2.0	-3.1	6.2
1988	-4.8	-6.3	-1.8	4.1	8.0	12.6	14.1	20.4	16.1	10.4	2.0	-1.5	6.1
1989	-2.6	-2.4	0.8	4.0	8.2	10.7	18.4	20.4	16.8	10.8	4.8	-1.3	7.4
1990	-5.7	-2.4	1.4	5.7	9.3	13.4	18.9	20.3	17.1	13.3	6.2	1.2	8.2
1991	-1.6	-3.6	-1.5	4.8	10.1	14.3	16.2	19.0	16.6	11.8	3.5	-2.3	7.3
1992	-3.6	-3.6	-0.4	3.7	8.1	12.1	17.6	18.0	14.9	11.1	3.2	-1.2	6.7
1993	-2.7	-3.3	-0.2	3.1	8.6	10.7	15.6	17.6	16.3	11.1	3.7	-1.6	6.6
1994	-6.1	-2.7	-1.3	4.4	10.0	12.8	17.4	21.7	17.5	11.8	4.3	-2.9	7.2
1995	-4.0	-4.0	-0.8	4.8	11.0	12.7	18.4	19.3	16.3	12.3	5.2	-0.6	7.6
1996	-4.6	-4.5	-1.0	3.5	6.9	12.0	15.9	18.7	16.8	10.4	2.3	-2.4	6.2
1997	-3.0	-3.3	-1.5	4.3	7.3	11.7	17.4	17.2	16.1	10.3	6.4	-0.7	6.9
1998	-6.9	-5.1	0.3	5.3	10.1	12.9	15.5	18.1	17.2	12.5	2.0	-2.4	6.6
1999	-4.1	-5.6	-2.6	4.2	8.4	14.5	16.6	21.0	18.3	11.2	3.8	-1.9	7.0
2000	-4.2	-5.6	-2.1	3.5	9.3	12.8	18.9	21.5	17.7	10.6	1.5	-4.1	6.7
2001	-6.3	-7.7	-2.4	4.7	8.5	13.0	17.4	18.7	15.6	10.8	4.0	-4.2	6.0
2002	-3.6	-1.0	0.5	6.8	11.1	12.1	15.7	17.1	17.0	10.8	2.3	-4.4	7.0
2003	-4.7	-5.6	-0.7	5.3	10.1	13.9	14.3	18.4	16.6	11.3	4.5	-1.4	6.8
2004	-3.9	-3.0	-0.5	4.4	10.6	14.6	16.8	19.7	17.8	11.8	5.9	-2.0	7.7
2005	-4.6	-5.7	-1.0	3.9	7.0	14.3	16.7	21.0	17.9	12.6	4.9	-2.3	7.1
2006	-5.5	-4.7	-0.9	2.1	9.3	11.9	18.4	21.6	17.7	11.0	4.5	-1.8	7.0
2007	-3.7	-3.2	-0.7	3.5	7.6	14.3	16.7	20.4	17.0	10.9	3.0	-1.7	7.0
2008	-6.0	-4.8	0.6	6.0	8.3	11.9	17.9	18.8	17.9	11.5	3.8	-0.4	7.1
2009	-2.4	-4.4	0.0	4.5	10.0	12.3	14.8	18.6	16.9	11.4	3.1	-2.2	6.9
2010	-3.4	-4.9	-1.4	3.5	7.3	15.0	18.1	22.4	18.4	11.4	4.8	-1.1	7.5
2011	-5.1	-2.2	-0.6	4.4	6.5	12.8	17.5 )	21.5	18.3	12.1	4.9	-2.3	7.3
2012	-5.4	-6.4	-2.4	4.6	8.9	12.6	17.2	20.4	19.4	11.8	3.8	-3.0	6.8
2013	-5.8	-5.1	-1.3	4.5	4.9 ]								-1.9 ]

Remarks

The red lines indicate data inhomogeneities caused by changes in instrumentation, observation methods and/or observing station locations.