Oshima Weather Records (JA000047675)

Record envelope, standing records and threshold days for Oshima (JA000047675), Japan, with 76 years of record.

Key Facts for Oshima

Oshima (JA000047675) is a weather station in Japan at 34.75 latitude and 139.38 longitude, 79 m (259 ft) above sea level.
The station reports from 1951 to 2026, 76 years of record.
1,464 records set at Oshima still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Oshima set a daily record precipitation of 157.2 mm (6.2 in) on 3 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Japan, 34.75 latitude, 139.38 longitude.
Elevation: 79 m (259 ft).
Period of record: 1951 to 2026, 76 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

10 days at or beyond a record

The band shows the record high and record low for each calendar day at Oshima. The lines show the 2026 daily maximum and minimum. 10 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Oshima, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	20.9 C (69.6 F)	-10.2 C (13.6 F)	16.9 C (62.4 F)	0.2 C (32.4 F)
Feb	21.0 C (69.8 F)	-4.0 C (24.8 F)	19.2 C (66.6 F)	-2.3 C (27.9 F)
Mar	22.5 C (72.5 F)	-1.4 C (29.5 F)	18.5 C (65.3 F)	4.1 C (39.4 F)
Apr	25.5 C (77.9 F)	0.1 C (32.2 F)	22.4 C (72.3 F)	8.7 C (47.7 F)
May	28.4 C (83.1 F)	5.3 C (41.5 F)	27.6 C (81.7 F)	5.3 C (41.5 F)
Jun	32.3 C (90.1 F)	10.5 C (50.9 F)	26.9 C (80.4 F)	16.1 C (61.0 F)
Jul	34.3 C (93.7 F)	12.4 C (54.3 F)	32.6 C (90.7 F)	19.6 C (67.3 F)
Aug	34.1 C (93.4 F)	16.0 C (60.8 F)	32.5 C (90.5 F)	19.5 C (67.1 F)
Sep	33.7 C (92.7 F)	12.4 C (54.3 F)	30.6 C (87.1 F)	16.4 C (61.5 F)
Oct	29.4 C (84.9 F)	7.2 C (45.0 F)	27.1 C (80.8 F)	17.4 C (63.3 F)
Nov	24.8 C (76.6 F)	3.0 C (37.4 F)	n/a	n/a
Dec	22.8 C (73.0 F)	-3.0 C (26.6 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Oshima still stand. 2025 holds the most, with 86.

Standing records at Oshima by the year they were set
Year set	Standing records
1951	10
1952	17
1953	27
1954	29
1955	10
1956	26
1957	17
1958	20
1959	14
1960	18
1961	11
1962	8
1963	22
1964	19
1965	26
1966	25
1967	28
1968	16
1969	30
1970	21
1971	20
1972	18
1973	21
1974	11
1975	9
1976	26
1977	30
1978	11
1979	15
1980	41
1981	32
1982	17
1983	16
1984	29
1985	18
1986	19
1987	28
1988	35
1989	14
1990	5
1991	8
1992	5
1993	16
1994	16
1995	8
1996	16
1997	16
1998	27
1999	13
2000	10
2001	14
2002	23
2003	15
2004	20
2005	7
2006	11
2007	13
2008	18
2009	14
2010	29
2011	25
2012	15
2013	21
2014	7
2015	20
2016	19
2017	14
2018	30
2019	23
2020	19
2021	6
2022	8
2023	16
2024	18
2025	86
2026	29

All-Time Record Progression

10 new records

10 all-time records were set at Oshima between 26 February 1981 and 18 August 2024. Each dot is a new record.

When Oshima set new all-time records
Date	Kind	Detail
1981-02-26	Record low minimum temperature	Record low minimum temperature -3.1 C (26.4 F)
1981-02-27	Record low minimum temperature	Record low minimum temperature -3.2 C (26.2 F)
1981-10-22	Record daily precipitation	Record daily precipitation 403.0 mm (15.9 in)
1990-01-28	Record low minimum temperature	Record low minimum temperature -10.2 C (13.6 F)
1994-08-01	Record high minimum temperature	Record high minimum temperature 26.6 C (79.9 F)
1994-08-07	Record high minimum temperature	Record high minimum temperature 26.9 C (80.4 F)
2004-07-21	Record high maximum temperature	Record high maximum temperature 34.3 C (93.7 F)
2018-07-17	Record high minimum temperature	Record high minimum temperature 27.0 C (80.6 F)
2024-08-11	Record high minimum temperature	Record high minimum temperature 27.3 C (81.1 F)
2024-08-18	Record high minimum temperature	Record high minimum temperature 27.6 C (81.7 F)

Wettest Day of Each Month

Oct: 403.0 mm (15.9 in)

The wettest day on record for each calendar month at Oshima. The most was 403.0 mm (15.9 in) on 22 October 1981.

Record daily precipitation for each month at Oshima
Month	Record daily precipitation (mm)	Date
Jan	189.5 mm (7.5 in)	23 January 1989
Feb	138.9 mm (5.5 in)	15 February 1991
Mar	226.5 mm (8.9 in)	23 March 1986
Apr	201.9 mm (7.9 in)	2 April 2013
May	240.5 mm (9.5 in)	29 May 2009
Jun	271.9 mm (10.7 in)	4 June 1963
Jul	342.5 mm (13.5 in)	15 July 1972
Aug	301.0 mm (11.9 in)	4 August 1986
Sep	374.3 mm (14.7 in)	26 September 1958
Oct	403.0 mm (15.9 in)	22 October 1981
Nov	347.0 mm (13.7 in)	30 November 1990
Dec	149.0 mm (5.9 in)	5 December 1968

Period of Record Coverage

1951 to 2026

76 years of record at Oshima, 1951 to 2026. 19 years have data for under 90 percent of days and are left out of rankings: 1996, 1998, 2002, 2003, 2004, 2006, 2013, 2014 and others.

Days with data per year at Oshima
Year	Days with data	Share of year	Complete
1951	365	100%	Yes
1952	366	100%	Yes
1953	357	98%	Yes
1954	361	99%	Yes
1955	357	98%	Yes
1956	359	98%	Yes
1957	357	98%	Yes
1958	359	98%	Yes
1959	360	99%	Yes
1960	360	98%	Yes
1961	357	98%	Yes
1962	361	99%	Yes
1963	358	98%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	363	99%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	343	94%	Yes
1991	333	91%	Yes
1992	337	92%	Yes
1993	332	91%	Yes
1994	337	92%	Yes
1995	338	93%	Yes
1996	327	89%	No
1997	337	92%	Yes
1998	320	88%	No
1999	329	90%	Yes
2000	334	91%	Yes
2001	342	94%	Yes
2002	319	87%	No
2003	325	89%	No
2004	328	90%	No
2005	339	93%	Yes
2006	326	89%	No
2007	342	94%	Yes
2008	338	92%	Yes
2009	342	94%	Yes
2010	331	91%	Yes
2011	342	94%	Yes
2012	338	92%	Yes
2013	112	31%	No
2014	2	1%	No
2015	267	73%	No
2016	317	87%	No
2017	312	85%	No
2018	319	87%	No
2019	315	86%	No
2020	70	19%	No
2021	3	1%	No
2022	144	39%	No
2023	7	2%	No
2024	3	1%	No
2025	358	98%	Yes
2026	275	75%	No

Latest Records

Latest records at Oshima
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
3 October 2026	Oshima, JP	daily rain (Provisional)	157.2 mm (6.2 in)	60.4 mm (2.4 in)	72 years	42 of 100 (Notable)
22 September 2026	Oshima, JP	daily high max (Provisional)	29.8 C (85.6 F)	0.1 C (0.2 F)	16 years	11 of 100 (Routine)
14 September 2026	Oshima, JP	daily rain (Provisional)	179.0 mm (7.0 in)	95.0 mm (3.7 in)	57 years	50 of 100 (Notable)
8 September 2026	Oshima, JP	daily high max (Provisional)	30.6 C (87.1 F)	0.1 C (0.2 F)	9 years	9 of 100 (Routine)
3 September 2026	Oshima, JP	daily rain (Provisional)	267.4 mm (10.5 in)	191.9 mm (7.6 in)	55 years	63 of 100 (Major)
26 August 2026	Oshima, JP	daily high min (Provisional)	26.9 C (80.4 F)	0.6 C (1.1 F)	0 years	10 of 100 (Routine)
25 August 2026	Oshima, JP	daily high min (Tie, Provisional)	26.8 C (80.2 F)	tie	0 years	1 of 100 (Routine)
24 August 2026	Oshima, JP	daily high min (Provisional)	26.4 C (79.5 F)	0.3 C (0.5 F)	31 years	17 of 100 (Routine)
12 August 2026	Oshima, JP	daily rain	98.5 mm (3.9 in)	10.6 mm (0.4 in)	67 years	29 of 100 (Routine)
2 August 2026	Oshima, JP	daily rain	78.0 mm (3.1 in)	25.0 mm (1.0 in)	45 years	27 of 100 (Routine)
31 July 2026	Oshima, JP	daily rain	125.0 mm (4.9 in)	37.9 mm (1.5 in)	63 years	37 of 100 (Notable)
29 July 2026	Oshima, JP	daily rain	99.0 mm (3.9 in)	6.8 mm (0.27 in)	16 years	13 of 100 (Routine)
26 July 2026	Oshima, JP	daily high max	32.4 C (90.3 F)	0.1 C (0.2 F)	31 years	16 of 100 (Routine)
23 July 2026	Oshima, JP	daily high min	26.4 C (79.5 F)	0.2 C (0.4 F)	24 years	14 of 100 (Routine)
22 July 2026	Oshima, JP	daily high min	26.1 C (79.0 F)	0.4 C (0.7 F)	0 years	8 of 100 (Routine)
21 July 2026	Oshima, JP	monthly high min	27.4 C (81.3 F)	0.4 C (0.7 F)	8 years	20 of 100 (Routine)
20 July 2026	Oshima, JP	daily high min	26.8 C (80.2 F)	1.0 C (1.8 F)	0 years	11 of 100 (Routine)
15 July 2026	Oshima, JP	daily high min	26.6 C (79.9 F)	1.0 C (1.8 F)	0 years	11 of 100 (Routine)
14 July 2026	Oshima, JP	daily high min	26.4 C (79.5 F)	0.9 C (1.6 F)	24 years	17 of 100 (Routine)
14 July 2026	Oshima, JP	daily high max (Tie)	32.2 C (90.0 F)	tie	8 years	2 of 100 (Routine)

Climate Trend

40 complete years, 1951 to 2025

One stripe for each of 40 complete years at Oshima, 1951 to 2025. Blue stripes are years cooler than the station's own mean of 15.2 C (59.4 F); red stripes are warmer. The coolest year was 1984, at 14.3 C (57.8 F), and the warmest was 2025, at 17.7 C (63.9 F). The strongest colour marks a difference of 2.6 C (4.7 F).

Annual mean temperature at Oshima as warming stripes, 1951 to 2025
Year	Annual mean temperature	Difference from the station mean
1951	15.5 C	+0.23 C
1952	15.2 C	+0.01 C
1953	15.2 C	-0.05 C
1954	15.4 C	+0.16 C
1955	15.8 C	+0.53 C
1956	15.2 C	-0.06 C
1957	15.0 C	-0.20 C
1958	15.4 C	+0.19 C
1959	16.0 C	+0.73 C
1960	15.8 C	+0.54 C
1961	16.0 C	+0.81 C
1962	15.3 C	+0.10 C
1963	14.7 C	-0.50 C
1964	15.2 C	-0.07 C
1965	14.8 C	-0.46 C
1966	15.3 C	+0.11 C
1967	15.2 C	-0.02 C
1968	15.0 C	-0.20 C
1969	15.1 C	-0.13 C
1970	14.7 C	-0.50 C
1971	14.9 C	-0.34 C
1972	15.3 C	+0.05 C
1973	14.9 C	-0.38 C
1974	14.6 C	-0.59 C
1975	15.1 C	-0.18 C
1976	14.8 C	-0.39 C
1977	15.4 C	+0.19 C
1978	15.5 C	+0.23 C
1979	15.9 C	+0.68 C
1980	14.7 C	-0.58 C
1981	14.6 C	-0.66 C
1982	15.2 C	-0.06 C
1983	15.1 C	-0.17 C
1984	14.3 C	-0.91 C
1985	15.0 C	-0.24 C
1986	14.6 C	-0.61 C
1987	15.5 C	+0.31 C
1988	14.8 C	-0.44 C
1989	15.5 C	+0.30 C
2025	17.7 C	+2.50 C

The fitted trend in annual mean temperature here over 1951 to 2025 is 0.09 C (-0.04 to 0.22) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.1 to 0.4) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Oshima
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.09 C (-0.04 to 0.22) per decade	0.2 F (-0.1 to 0.4) per decade	1951 to 2025	40	Not clearly different from zero
Mean daily maximum	0.10 C (-0.02 to 0.22) per decade	0.18 F (-0.03 to 0.40) per decade	1951 to 2025	40	Not clearly different from zero
Mean daily minimum	0.1 C (-0.1 to 0.2) per decade	0.1 F (-0.1 to 0.4) per decade	1951 to 2025	40	Not clearly different from zero

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1951 to 2026

Yearly extremes at Oshima: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	34.3 C (93.7 F)	2004	31.4 C (88.5 F)	76
Coldest night (TNn)	-10.2 C (13.6 F)	1990	-1.2 C (29.8 F)	76
Wettest day (Rx1day)	403.0 mm (15.9 in)	1981	181.6 mm (7.1 in)	76
Wettest five days (Rx5day)	598.7 mm (23.6 in)	1963	266.9 mm (10.5 in)	75
Longest dry spell (CDD)	35 days	2008	16 days	74

Hottest day (TXx)

The hottest day of the year at Oshima, 1951 to 2026. The record is 34.3 C (93.7 F) in 2004, marked on the chart; the median year is 31.4 C (88.5 F).

Hottest day (TXx) at Oshima by year
Year	Hottest day (TXx)
1951	32.2 C (90.0 F)
1952	31.4 C (88.5 F)
1953	34.1 C (93.4 F)
1954	30.9 C (87.6 F)
1955	29.9 C (85.8 F)
1956	33.2 C (91.8 F)
1957	31.2 C (88.2 F)
1958	29.8 C (85.6 F)
1959	30.2 C (86.4 F)
1960	31.0 C (87.8 F)
1961	31.4 C (88.5 F)
1962	31.2 C (88.2 F)
1963	29.4 C (84.9 F)
1964	32.8 C (91.0 F)
1965	31.2 C (88.2 F)
1966	32.6 C (90.7 F)
1967	32.0 C (89.6 F)
1968	29.3 C (84.7 F)
1969	31.1 C (88.0 F)
1970	30.3 C (86.5 F)
1971	30.5 C (86.9 F)
1972	30.5 C (86.9 F)
1973	30.7 C (87.3 F)
1974	29.8 C (85.6 F)
1975	30.9 C (87.6 F)
1976	29.5 C (85.1 F)
1977	30.6 C (87.1 F)
1978	30.4 C (86.7 F)
1979	30.0 C (86.0 F)
1980	29.7 C (85.5 F)
1981	30.5 C (86.9 F)
1982	30.1 C (86.2 F)
1983	32.1 C (89.8 F)
1984	31.8 C (89.2 F)
1985	31.6 C (88.9 F)
1986	30.9 C (87.6 F)
1987	32.0 C (89.6 F)
1988	30.5 C (86.9 F)
1989	29.9 C (85.8 F)
1990	30.7 C (87.3 F)
1991	31.0 C (87.8 F)
1992	31.3 C (88.3 F)
1993	30.6 C (87.1 F)
1994	32.9 C (91.2 F)
1995	32.3 C (90.1 F)
1996	31.5 C (88.7 F)
1997	32.8 C (91.0 F)
1998	32.2 C (90.0 F)
1999	32.2 C (90.0 F)
2000	32.0 C (89.6 F)
2001	33.3 C (91.9 F)
2002	32.2 C (90.0 F)
2003	31.5 C (88.7 F)
2004	34.3 C (93.7 F)
2005	31.5 C (88.7 F)
2006	32.8 C (91.0 F)
2007	32.5 C (90.5 F)
2008	33.6 C (92.5 F)
2009	32.2 C (90.0 F)
2010	33.9 C (93.0 F)
2011	32.7 C (90.9 F)
2012	32.6 C (90.7 F)
2013	28.6 C (83.5 F)
2014	30.4 C (86.7 F)
2015	33.3 C (91.9 F)
2016	32.7 C (90.9 F)
2017	33.0 C (91.4 F)
2018	33.9 C (93.0 F)
2019	32.4 C (90.3 F)
2020	25.1 C (77.2 F)
2021	30.4 C (86.7 F)
2022	32.1 C (89.8 F)
2023	30.6 C (87.1 F)
2024	24.0 C (75.2 F)
2025	33.6 C (92.5 F)
2026	32.6 C (90.7 F)

Coldest night (TNn)

The coldest night of the year at Oshima, 1951 to 2026. The record is -10.2 C (13.6 F) in 1990, marked on the chart; the median year is -1.2 C (29.8 F).

Coldest night (TNn) at Oshima by year
Year	Coldest night (TNn)
1951	-0.5 C (31.1 F)
1952	-1.6 C (29.1 F)
1953	-1.1 C (30.0 F)
1954	0.3 C (32.5 F)
1955	-1.9 C (28.6 F)
1956	-0.1 C (31.8 F)
1957	-0.9 C (30.4 F)
1958	-0.3 C (31.5 F)
1959	-0.8 C (30.6 F)
1960	-1.9 C (28.6 F)
1961	0.1 C (32.2 F)
1962	1.1 C (34.0 F)
1963	-2.8 C (27.0 F)
1964	-0.4 C (31.3 F)
1965	-1.6 C (29.1 F)
1966	-0.7 C (30.7 F)
1967	-2.1 C (28.2 F)
1968	-1.0 C (30.2 F)
1969	0.4 C (32.7 F)
1970	-1.2 C (29.8 F)
1971	-0.9 C (30.4 F)
1972	0.7 C (33.3 F)
1973	-1.8 C (28.8 F)
1974	-0.8 C (30.6 F)
1975	-2.8 C (27.0 F)
1976	-1.8 C (28.8 F)
1977	-1.8 C (28.8 F)
1978	-0.9 C (30.4 F)
1979	0.8 C (33.4 F)
1980	-0.5 C (31.1 F)
1981	-3.2 C (26.2 F)
1982	-2.1 C (28.2 F)
1983	-1.0 C (30.2 F)
1984	-3.1 C (26.4 F)
1985	-1.9 C (28.6 F)
1986	-1.0 C (30.2 F)
1987	-0.9 C (30.4 F)
1988	-0.7 C (30.7 F)
1989	-0.4 C (31.3 F)
1990	-10.2 C (13.6 F)
1991	-0.9 C (30.4 F)
1992	-1.2 C (29.8 F)
1993	-1.1 C (30.0 F)
1994	-2.3 C (27.9 F)
1995	-3.0 C (26.6 F)
1996	-4.0 C (24.8 F)
1997	-3.5 C (25.7 F)
1998	-2.4 C (27.7 F)
1999	-0.8 C (30.6 F)
2000	-2.2 C (28.0 F)
2001	-0.8 C (30.6 F)
2002	-1.4 C (29.5 F)
2003	-2.1 C (28.2 F)
2004	-1.2 C (29.8 F)
2005	-1.4 C (29.5 F)
2006	-2.5 C (27.5 F)
2007	-0.4 C (31.3 F)
2008	-2.0 C (28.4 F)
2009	-0.6 C (30.9 F)
2010	-1.8 C (28.8 F)
2011	-2.6 C (27.3 F)
2012	-2.2 C (28.0 F)
2013	-1.4 C (29.5 F)
2014	-1.4 C (29.5 F)
2015	-1.0 C (30.2 F)
2016	-3.3 C (26.1 F)
2017	-0.8 C (30.6 F)
2018	-2.4 C (27.7 F)
2019	0.6 C (33.1 F)
2020	1.3 C (34.3 F)
2021	-1.2 C (29.8 F)
2022	-1.3 C (29.7 F)
2023	-1.2 C (29.8 F)
2024	0.0 C (32.0 F)
2025	-1.5 C (29.3 F)
2026	-2.3 C (27.9 F)

Wettest day (Rx1day)

The wettest day of the year at Oshima, 1951 to 2026. The record is 403.0 mm (15.9 in) in 1981, marked on the chart; the median year is 181.6 mm (7.1 in).

Wettest day (Rx1day) at Oshima by year
Year	Wettest day (Rx1day)
1951	159.2 mm (6.3 in)
1952	164.9 mm (6.5 in)
1953	113.6 mm (4.5 in)
1954	159.5 mm (6.3 in)
1955	152.9 mm (6.0 in)
1956	123.5 mm (4.9 in)
1957	115.6 mm (4.6 in)
1958	374.3 mm (14.7 in)
1959	112.4 mm (4.4 in)
1960	157.3 mm (6.2 in)
1961	224.5 mm (8.8 in)
1962	141.9 mm (5.6 in)
1963	271.9 mm (10.7 in)
1964	118.1 mm (4.6 in)
1965	175.4 mm (6.9 in)
1966	229.7 mm (9.0 in)
1967	96.0 mm (3.8 in)
1968	149.0 mm (5.9 in)
1969	181.0 mm (7.1 in)
1970	196.5 mm (7.7 in)
1971	216.0 mm (8.5 in)
1972	342.5 mm (13.5 in)
1973	206.5 mm (8.1 in)
1974	146.0 mm (5.7 in)
1975	137.0 mm (5.4 in)
1976	276.0 mm (10.9 in)
1977	134.5 mm (5.3 in)
1978	124.5 mm (4.9 in)
1979	199.5 mm (7.9 in)
1980	270.0 mm (10.6 in)
1981	403.0 mm (15.9 in)
1982	246.5 mm (9.7 in)
1983	183.0 mm (7.2 in)
1984	138.0 mm (5.4 in)
1985	184.5 mm (7.3 in)
1986	301.0 mm (11.9 in)
1987	129.5 mm (5.1 in)
1988	145.0 mm (5.7 in)
1989	189.5 mm (7.5 in)
1990	347.0 mm (13.7 in)
1991	167.9 mm (6.6 in)
1992	121.9 mm (4.8 in)
1993	221.0 mm (8.7 in)
1994	115.1 mm (4.5 in)
1995	182.1 mm (7.2 in)
1996	341.9 mm (13.5 in)
1997	119.9 mm (4.7 in)
1998	115.1 mm (4.5 in)
1999	254.0 mm (10.0 in)
2000	137.9 mm (5.4 in)
2001	132.8 mm (5.2 in)
2002	248.9 mm (9.8 in)
2003	251.0 mm (9.9 in)
2004	209.0 mm (8.2 in)
2005	201.4 mm (7.9 in)
2006	193.0 mm (7.6 in)
2007	166.9 mm (6.6 in)
2008	158.5 mm (6.2 in)
2009	240.5 mm (9.5 in)
2010	110.0 mm (4.3 in)
2011	105.9 mm (4.2 in)
2012	233.9 mm (9.2 in)
2013	201.9 mm (7.9 in)
2014	150.9 mm (5.9 in)
2015	107.4 mm (4.2 in)
2016	291.1 mm (11.5 in)
2017	299.0 mm (11.8 in)
2018	150.9 mm (5.9 in)
2019	302.0 mm (11.9 in)
2020	275.1 mm (10.8 in)
2021	246.9 mm (9.7 in)
2022	202.9 mm (8.0 in)
2023	133.1 mm (5.2 in)
2024	193.0 mm (7.6 in)
2025	69.0 mm (2.7 in)
2026	267.4 mm (10.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Oshima, 1951 to 2026. The record is 598.7 mm (23.6 in) in 1963, marked on the chart; the median year is 266.9 mm (10.5 in).

Wettest five days (Rx5day) at Oshima by year
Year	Wettest five days (Rx5day)
1951	284.4 mm (11.2 in)
1952	268.6 mm (10.6 in)
1953	209.0 mm (8.2 in)
1954	405.6 mm (16.0 in)
1955	246.2 mm (9.7 in)
1956	220.5 mm (8.7 in)
1957	340.8 mm (13.4 in)
1958	529.8 mm (20.9 in)
1959	207.8 mm (8.2 in)
1960	217.0 mm (8.5 in)
1961	236.8 mm (9.3 in)
1962	216.5 mm (8.5 in)
1963	598.7 mm (23.6 in)
1964	200.7 mm (7.9 in)
1965	272.1 mm (10.7 in)
1966	271.2 mm (10.7 in)
1967	214.1 mm (8.4 in)
1968	248.0 mm (9.8 in)
1969	211.0 mm (8.3 in)
1970	344.0 mm (13.5 in)
1971	375.5 mm (14.8 in)
1972	436.5 mm (17.2 in)
1973	207.0 mm (8.1 in)
1974	195.5 mm (7.7 in)
1975	200.5 mm (7.9 in)
1976	289.0 mm (11.4 in)
1977	251.5 mm (9.9 in)
1978	200.5 mm (7.9 in)
1979	300.0 mm (11.8 in)
1980	320.0 mm (12.6 in)
1981	403.5 mm (15.9 in)
1982	369.5 mm (14.5 in)
1983	357.5 mm (14.1 in)
1984	238.5 mm (9.4 in)
1985	231.5 mm (9.1 in)
1986	357.0 mm (14.1 in)
1987	238.0 mm (9.4 in)
1988	324.5 mm (12.8 in)
1989	307.5 mm (12.1 in)
1990	109.9 mm (4.3 in)
1991	380.2 mm (15.0 in)
1992	142.6 mm (5.6 in)
1993	153.4 mm (6.0 in)
1994	247.6 mm (9.7 in)
1995	119.1 mm (4.7 in)
1996	77.9 mm (3.1 in)
1997	n/a
1998	97.6 mm (3.8 in)
1999	338.9 mm (13.3 in)
2000	208.5 mm (8.2 in)
2001	220.7 mm (8.7 in)
2002	88.9 mm (3.5 in)
2003	400.9 mm (15.8 in)
2004	352.5 mm (13.9 in)
2005	266.9 mm (10.5 in)
2006	217.2 mm (8.6 in)
2007	290.4 mm (11.4 in)
2008	325.1 mm (12.8 in)
2009	265.3 mm (10.4 in)
2010	304.5 mm (12.0 in)
2011	152.4 mm (6.0 in)
2012	406.4 mm (16.0 in)
2013	350.0 mm (13.8 in)
2014	256.8 mm (10.1 in)
2015	227.0 mm (8.9 in)
2016	307.6 mm (12.1 in)
2017	539.0 mm (21.2 in)
2018	245.9 mm (9.7 in)
2019	380.0 mm (15.0 in)
2020	468.1 mm (18.4 in)
2021	378.2 mm (14.9 in)
2022	361.9 mm (14.2 in)
2023	167.7 mm (6.6 in)
2024	294.1 mm (11.6 in)
2025	135.5 mm (5.3 in)
2026	369.5 mm (14.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Oshima, 1951 to 2026. The record is 35 days in 2008, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Oshima by year
Year	Longest dry spell (CDD)
1951	17 days
1952	15 days
1953	10 days
1954	12 days
1955	18 days
1956	20 days
1957	18 days
1958	13 days
1959	13 days
1960	22 days
1961	14 days
1962	21 days
1963	18 days
1964	25 days
1965	15 days
1966	31 days
1967	24 days
1968	16 days
1969	22 days
1970	17 days
1971	14 days
1972	11 days
1973	27 days
1974	17 days
1975	22 days
1976	27 days
1977	19 days
1978	12 days
1979	16 days
1980	19 days
1981	17 days
1982	11 days
1983	11 days
1984	21 days
1985	20 days
1986	18 days
1987	16 days
1988	27 days
1989	16 days
1990	3 days
1991	2 days
1992	3 days
1993	2 days
1994	2 days
1995	2 days
1996	3 days
1997	2 days
1998	2 days
1999	11 days
2000	n/a
2001	n/a
2002	2 days
2003	19 days
2004	19 days
2005	19 days
2006	15 days
2007	17 days
2008	35 days
2009	13 days
2010	19 days
2011	15 days
2012	16 days
2013	13 days
2014	20 days
2015	17 days
2016	12 days
2017	14 days
2018	19 days
2019	15 days
2020	24 days
2021	11 days
2022	16 days
2023	15 days
2024	17 days
2025	16 days
2026	14 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

58 years, 1951 to 2024

A day with at least 177.5 mm (7.0 in) of rain is expected about once in 2 years. A day with at least 445.7 mm (17.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Oshima: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	177.5 mm (7.0 in)
5 years	241.2 mm (9.5 in)
10 years	286.5 mm (11.3 in)
25 years	347.4 mm (13.7 in)
50 years	395.4 mm (15.6 in)
100 years	445.7 mm (17.5 in)	Longer than the 58 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 58 years of values from 1951 to 2024.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 403.0 mm (15.9 in) in 1981; 374.3 mm (14.7 in) in 1958; 342.5 mm (13.5 in) in 1972.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Oshima standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Oshima threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).