Monthly mean global solar radiation (MJ/m²)

WAKKANAI   WMO Station ID:47401 Lat 45^o24.9'N  Lon 141^o40.7'E

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual
1961	3.4	6.0	9.0	11.9 )	13.1	16.6 )	13.6	12.1 )	10.8	7.2	4.5	2.4 )	9.2
1962	3.7	7.5	9.4	12.3 )	15.9 )	14.3 )	12.2 )	9.4	10.1 )	7.9	4.1 )	2.8 )	9.1
1963	3.7 )	6.8	11.1	11.7	19.9 )	20.5	16.7 )	11.6	14.6 )	10.5 )	5.2 )	3.1 )	11.3
1964	4.1	9.2	13.0	15.9	20.1	17.6	16.7 )	12.1	12.9	7.5	4.4	2.6	11.3
1965	3.5	6.2 )	10.4	17.2	17.5	17.4	16.6	15.5	10.0	8.5	3.4	2.2 )	10.7
1966	2.8	4.7	9.5 )	13.4	17.0	17.0	14.9 )	11.8	15.4	8.5	5.3	3.3	10.3
1967	4.9 )	9.0	13.7	17.5	18.2	17.6	16.6	19.1	12.4	10.8	5.3	3.4	12.4
1968	4.6 )	8.9 )	12.9	19.1 )	15.9	22.3	16.2 )	15.0 )	13.9 )	9.3	4.7	4.0	12.3
1969	4.3 )	8.7 )	15.1 )	18.8	16.7	15.2	17.9 )	13.5	13.2	7.2	4.4	2.8	11.5
1970	3.8	7.2	10.6	14.7	13.7	11.9	12.6	10.0 )	10.4 ]	9.3	4.7	2.9 )	9.2 ]
1971	4.6	6.2 ]	11.3	14.5	14.5 )	16.9	13.1	12.6	11.3	8.0 )	4.8	3.1	10.4 ]
1972	4.4	7.2 )	12.8	15.1 )	15.3	14.4	16.2	14.4	10.8	6.9	3.0	2.4	9.0 ]
1973	4.2	5.2	11.0	13.3	16.5	20.5	13.8	14.6	13.1	7.4 )	3.5	2.5	10.5
1974	3.5	7.1	12.1	13.1	14.6 )	16.4	18.5	13.3	11.5	6.7	3.5	2.8	10.3
1975	3.3	6.9	10.6	12.4	13.3	14.7 )	×	15.2 ]	12.9 )	7.7	5.2 )	3.2 )	9.0 ]
1976	4.2 )	7.7	11.8 )	14.9	18.7	17.5	18.8	14.4	12.7	7.2	3.1	3.1	11.2
1977	4.4	8.0	11.5	13.6	15.3	16.7	14.5	18.0	12.1	8.8	4.2	2.8	10.8
1978	4.0	8.7	13.8	13.9	17.0	17.5	16.7	14.0	15.1	7.8	4.9	2.9	11.4
1979	3.6	6.8	11.9	15.9 )	18.3 )	17.8	17.7	18.7	12.9	8.4	3.7	2.8	11.6
1980	3.3	7.2	12.2	14.4	16.5	17.4	16.1	15.2	13.4	8.7	4.6	2.5	11.0
1981	4.8	8.1	12.0 )	15.7	16.1	16.9	15.7	10.9	13.8	7.8	3.5	2.9	10.7
1982	3.9	8.3	11.1	14.2	16.9	20.8 )	17.4	15.2	14.2	8.5	4.1	2.8	11.5
1983	3.9	7.1	11.9	16.2	15.5	14.2	16.3	16.0	10.8	8.0	5.0	3.1	10.7
1984	4.6	7.3	13.3	17.1	16.0	19.1	18.9 )	14.3	13.8	8.4	4.9	3.2	11.7
1985	5.3	7.8	12.5	15.8	20.0	19.6	16.6	12.9	13.3	7.7 )	4.0	2.8 )	11.5
1986	4.4	7.7	11.9	13.6	15.7	19.5	14.4 )	15.1	14.1	9.5	3.7	3.4	11.1
1987	3.8	6.6	10.5 )	15.1	18.5	20.6 )	13.0 )	11.3	12.5	8.1	4.0 )	2.9 )	10.6
1988	3.7 )	7.2	12.2 )	13.4	18.8	18.2	19.9	12.8	14.7	8.1	4.5	2.8	11.4
1989	4.4	8.5	9.8	13.8	18.6	18.4	17.8	14.6	10.9	7.6	4.2	3.1	11.0
1990	4.3	6.4	12.9	14.9	16.2	16.8	20.1	13.3	13.2	9.6	5.3	3.0	11.3
1991	4.0	7.8	10.9	13.2 )	20.6	17.2 )	15.1	15.3 )	13.5 )	8.4	4.1 )	2.6	11.1
1992	4.0 )	7.1 )	12.9 )	11.9 )	15.7 )	18.2	14.7	13.8	9.5	8.8	3.4	2.6	10.2
1993	3.5	6.5	11.8	12.8	16.6	12.3	18.2	13.6	12.2 )	7.9	3.7	2.4	10.1
1994	3.7	5.7	10.1	14.6	17.3	18.1	14.4	15.6	9.9	8.5	3.8	2.5	10.4
1995	3.4	7.5	11.3	13.1	16.9	19.4	17.1	13.4	14.6	8.5	3.2	3.3 )	11.0
1996	3.3 )	7.5	11.5	18.2	15.5	16.3	14.5	15.2	12.6	8.2	4.5	2.4	10.8
1997	3.9	7.9	12.0	17.5	15.7	13.2	14.4 )	11.6 )	14.7	7.3	4.9	3.2 )	10.5
1998	3.6 )	7.9	12.3	16.1	20.7	21.7	15.4	12.8	12.6	9.6 )	3.3 )	2.8 )	11.6
1999	4.2	7.4 )	11.1	16.9	16.2	22.1 )	15.3	16.4	14.2 )	8.3	3.7	2.7	11.5
2000	4.0	8.4	11.8	14.0	16.4	16.4	15.0	16.4	11.5	7.8	4.0	2.9	10.7
2001	4.0	6.4	11.2	15.5	17.4	17.0	16.6 )	16.6	13.0	7.7	4.0	2.4	11.0
2002	4.2	7.8	11.6	16.5	22.0 )	17.2	14.6	12.3	16.6	7.7	3.3	2.8 )	11.4
2003	4.3 )	9.5	13.5	15.7	19.3	19.8	18.7	14.4	14.2	8.0	3.7 )	3.1	12.0
2004	3.7 )	5.8	10.7	16.5	16.7	19.5	16.3	17.1	13.8	8.5	4.5	2.7	11.3
2005	3.7	6.7	10.6	13.4	18.0	21.1	17.8	16.9	14.2	8.9	4.5	3.3	11.6
2006	4.2 )	6.9	9.4	14.0	18.9	16.1	19.5	13.9 )	12.7	9.8	4.2	2.7	11.0
2007	4.7	7.1	11.6	17.5	16.0	18.4	20.0	15.2	11.0	8.6	4.6	2.6 )	11.4
2008	3.9	7.8 )	12.2	16.6	15.8	19.2	14.7	16.0	14.0	8.4	4.2	2.8	11.3
2009	3.4	5.9	10.0	17.8	19.1	13.3	13.3	16.5	15.4	8.9	3.9	3.3	10.9
2010	3.8	6.2	10.5	13.9	16.5	20.8	12.3 )	16.3	14.5	9.2	4.3	2.8	10.9
2011	4.7	7.7	12.8	14.3	15.1	16.5	16.6 )	15.6	12.1	8.3	4.5	2.8	10.9
2012	4.1	7.0	11.6	16.5	15.6	20.3	15.2	15.4	10.5	8.2	3.3	2.4	10.8
2013	3.8	7.0	9.9	15.2	14.4	19.4	20.4	12.7	11.8	8.6	4.4	2.8	10.9
2014	4.0	8.0	14.1	18.0	15.9	18.7	17.6	16.3	12.4	8.8	5.1	2.9	11.8
2015	4.0	7.1	10.1	15.6	17.9	15.8	15.4	14.8	13.4	7.9	5.1	3.0	10.8
2016	3.4	5.3	12.0	14.2	19.9	17.4	17.4	15.7	11.9	6.6	3.3	3.2	10.9
2017	4.1	6.6	13.7	15.8	18.2	15.0	15.6	15.6	14.6	8.8	3.6	2.9	11.2
2018	3.4	6.4	12.1	16.2	17.0	14.6	18.0	15.1	15.6	9.3	4.4	2.6	11.2
2019	3.8	7.7	11.8	18.5	20.9	17.8	15.8	12.0	15.1	9.1	3.6	2.7	11.6
2020	4.4	7.0	12.9	17.4	19.2	15.4	19.2	13.1	12.3	8.5	3.6	2.9	11.3
2021	3.6	5.7	11.8	15.8	15.6	21.7	21.8	15.8	15.0	9.0	3.9	2.6	11.9
2022	4.1	7.7	11.0	17.1	17.3	15.1	18.6	16.4	14.5	7.9	4.3	2.8	11.4
2023	3.9	7.4	11.9	14.4	19.8	18.6	15.5	13.2	13.8	8.9 )	4.1	2.5	11.2
2024	3.4	7.7	12.9	15.8	17.1	17.9	17.1	12.2	15.5	9.3	4.4	2.9	11.4
2025	3.3	6.6	10.1	13.7	17.2	18.6	16.6	15.7	14.2	8.3	5.3 ]		12.4 ]

Remarks
The red lines, if any, indicate data inhomogeneity caused by changes in instrumentation, observation methods and/or site location.

Japan Meteorological Agency, 1-3-4 Otenachi, Chiyoda-ku, Tokyo 100-8122, Japan
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