Yokosuka Weather Records (JAW00043323)

Record envelope, standing records and threshold days for Yokosuka (JAW00043323), Japan, with 53 years of record.

Key Facts for Yokosuka

Yokosuka (JAW00043323) is a weather station in Japan at 35.28 latitude and 139.67 longitude, 53 m (174 ft) above sea level.
The station reports from 1953 to 2005, 53 years of record.
1,464 records set at Yokosuka still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Yokosuka tied a daily record low maximum temperature of 8.3 C (46.9 F) on 15 December 2005.

About the Station

Location: Japan, 35.28 latitude, 139.67 longitude.
Elevation: 53 m (174 ft).
Period of record: 1953 to 2005, 53 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Yokosuka. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Yokosuka, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	22.8 C (73.0 F)	-3.9 C (25.0 F)	n/a	n/a
Feb	23.9 C (75.0 F)	-3.9 C (25.0 F)	n/a	n/a
Mar	23.9 C (75.0 F)	-2.2 C (28.0 F)	n/a	n/a
Apr	28.3 C (82.9 F)	1.1 C (34.0 F)	n/a	n/a
May	32.2 C (90.0 F)	7.2 C (45.0 F)	n/a	n/a
Jun	37.8 C (100.0 F)	10.6 C (51.1 F)	n/a	n/a
Jul	38.9 C (102.0 F)	13.3 C (55.9 F)	n/a	n/a
Aug	41.1 C (106.0 F)	15.6 C (60.1 F)	n/a	n/a
Sep	37.8 C (100.0 F)	12.2 C (54.0 F)	n/a	n/a
Oct	32.2 C (90.0 F)	6.1 C (43.0 F)	n/a	n/a
Nov	27.2 C (81.0 F)	2.2 C (36.0 F)	n/a	n/a
Dec	25.0 C (77.0 F)	-1.1 C (30.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Yokosuka still stand. 1994 holds the most, with 107.

Standing records at Yokosuka by the year they were set
Year set	Standing records
1953	36
1954	52
1955	21
1956	21
1957	29
1958	26
1959	30
1960	25
1961	18
1962	18
1963	26
1964	25
1965	38
1966	33
1967	39
1968	25
1969	38
1970	27
1971	16
1972	15
1973	16
1974	16
1975	18
1976	40
1977	41
1978	16
1979	22
1980	39
1981	35
1982	20
1983	17
1984	50
1985	25
1986	16
1987	43
1988	42
1989	34
1990	59
1991	28
1992	33
1993	27
1994	107
1995	20
1996	29
1997	23
1998	25
2001	4
2002	16
2003	17
2004	17
2005	11

All-Time Record Progression

10 new records

10 all-time records were set at Yokosuka between 6 August 1984 and 5 August 1994. Each dot is a new record.

When Yokosuka set new all-time records
Date	Kind	Detail
1984-08-06	Record high maximum temperature	Record high maximum temperature 36.1 C (97.0 F)
1984-08-07	Record high maximum temperature	Record high maximum temperature 37.2 C (99.0 F)
1986-02-18	Record daily snowfall	Record daily snowfall 20.8 cm (8.2 in)
1987-07-25	Record high maximum temperature	Record high maximum temperature 37.8 C (100.0 F)
1987-08-17	Record high minimum temperature	Record high minimum temperature 27.2 C (81.0 F)
1994-07-03	Record high maximum temperature	Record high maximum temperature 38.9 C (102.0 F)
1994-07-27	Record high minimum temperature	Record high minimum temperature 27.8 C (82.0 F)
1994-08-03	Record high maximum temperature	Record high maximum temperature 40.0 C (104.0 F)
1994-08-05	Record high maximum temperature	Record high maximum temperature 41.1 C (106.0 F)
1994-08-05	Record high minimum temperature	Record high minimum temperature 28.9 C (84.0 F)

Wettest Day of Each Month

Jul: 281.2 mm (11.1 in)

The wettest day on record for each calendar month at Yokosuka. The most was 281.2 mm (11.1 in) on 8 July 1974.

Record daily precipitation for each month at Yokosuka
Month	Record daily precipitation (mm)	Date
Jan	48.0 mm (1.9 in)	4 January 1982
Feb	85.6 mm (3.4 in)	9 February 1985
Mar	94.2 mm (3.7 in)	30 March 1969
Apr	73.7 mm (2.9 in)	23 April 1985
May	127.5 mm (5.0 in)	14 May 1986
Jun	239.8 mm (9.4 in)	28 June 1966
Jul	281.2 mm (11.1 in)	8 July 1974
Aug	199.6 mm (7.9 in)	1 August 1989
Sep	210.8 mm (8.3 in)	30 September 1990
Oct	237.7 mm (9.4 in)	22 October 1981
Nov	170.2 mm (6.7 in)	17 November 1977
Dec	93.5 mm (3.7 in)	3 December 1959

Period of Record Coverage

1953 to 2005

51 years of record at Yokosuka, 1953 to 2005. 2 years have data for under 90 percent of days and are left out of rankings: 1953, 2001.

Days with data per year at Yokosuka
Year	Days with data	Share of year	Complete
1953	306	84%	No
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	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	364	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	365	100%	Yes
1987	334	92%	Yes
1988	365	100%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	365	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	332	91%	Yes
2001	242	66%	No
2002	332	91%	Yes
2003	352	96%	Yes
2004	333	91%	Yes
2005	363	99%	Yes

Latest Records

Latest records at Yokosuka
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 December 2005	Yokosuka, JP	daily low max (Tie)	8.3 C (46.9 F)	tie	48 years	4 of 100 (Routine)
6 November 2005	Yokosuka, JP	daily rain	46.7 mm (1.8 in)	8.1 mm (0.32 in)	2 years	9 of 100 (Routine)
29 October 2005	Yokosuka, JP	daily high min (Tie)	17.8 C (64.0 F)	tie	11 years	2 of 100 (Routine)
8 October 2005	Yokosuka, JP	daily high min (Tie)	22.2 C (72.0 F)	tie	11 years	2 of 100 (Routine)
2 October 2005	Yokosuka, JP	daily high max	28.3 C (82.9 F)	0.5 C (0.9 F)	10 years	9 of 100 (Routine)
2 October 2005	Yokosuka, JP	daily high min (Tie)	22.2 C (72.0 F)	tie	11 years	2 of 100 (Routine)
25 August 2005	Yokosuka, JP	daily rain	74.9 mm (2.9 in)	26.6 mm (1.0 in)	47 years	29 of 100 (Routine)
23 August 2005	Yokosuka, JP	daily rain	58.4 mm (2.3 in)	21.8 mm (0.9 in)	36 years	24 of 100 (Routine)
21 August 2005	Yokosuka, JP	daily high min	26.7 C (80.1 F)	0.6 C (1.1 F)	27 years	16 of 100 (Routine)
20 August 2005	Yokosuka, JP	daily high min	27.2 C (81.0 F)	1.1 C (2.0 F)	50 years	25 of 100 (Routine)
26 July 2005	Yokosuka, JP	daily rain	70.9 mm (2.8 in)	1.3 mm (0.05 in)	23 years	11 of 100 (Routine)
1 July 2005	Yokosuka, JP	daily high min (Tie)	23.3 C (73.9 F)	tie	44 years	4 of 100 (Routine)
12 June 2005	Yokosuka, JP	daily high min	21.7 C (71.1 F)	0.6 C (1.1 F)	14 years	11 of 100 (Routine)
14 May 2005	Yokosuka, JP	daily low max	15.6 C (60.1 F)	0.5 C (0.9 F)	26 years	13 of 100 (Routine)
28 April 2005	Yokosuka, JP	daily high min	18.3 C (64.9 F)	1.6 C (2.9 F)	46 years	22 of 100 (Routine)
13 April 2005	Yokosuka, JP	daily low max	10.6 C (51.1 F)	0.5 C (0.9 F)	52 years	21 of 100 (Routine)
12 April 2005	Yokosuka, JP	daily low max	8.3 C (46.9 F)	0.6 C (1.1 F)	18 years	11 of 100 (Routine)
10 April 2005	Yokosuka, JP	daily high min	15.6 C (60.1 F)	0.6 C (1.1 F)	36 years	17 of 100 (Routine)
7 April 2005	Yokosuka, JP	daily high min	16.7 C (62.1 F)	2.3 C (4.1 F)	50 years	27 of 100 (Routine)
22 March 2005	Yokosuka, JP	daily high max	19.4 C (66.9 F)	0.5 C (0.9 F)	23 years	12 of 100 (Routine)

Climate Trend

44 complete years, 1954 to 2005

One stripe for each of 44 complete years at Yokosuka, 1954 to 2005. Blue stripes are years cooler than the station's own mean of 15.9 C (60.6 F); red stripes are warmer. The coolest year was 1984, at 14.6 C (58.2 F), and the warmest was 1994, at 18.3 C (64.9 F). The strongest colour marks a difference of 2.4 C (4.3 F).

Annual mean temperature at Yokosuka as warming stripes, 1954 to 2005
Year	Annual mean temperature	Difference from the station mean
1954	15.3 C	-0.57 C
1955	16.1 C	+0.19 C
1956	15.8 C	-0.07 C
1957	15.1 C	-0.75 C
1958	15.6 C	-0.27 C
1959	16.0 C	+0.11 C
1960	15.7 C	-0.23 C
1961	16.0 C	+0.13 C
1962	15.5 C	-0.36 C
1963	15.1 C	-0.79 C
1964	15.4 C	-0.53 C
1965	15.1 C	-0.84 C
1966	15.5 C	-0.38 C
1967	15.6 C	-0.34 C
1968	15.4 C	-0.48 C
1969	15.4 C	-0.45 C
1970	15.0 C	-0.85 C
1971	15.2 C	-0.72 C
1972	15.9 C	-0.02 C
1973	15.7 C	-0.17 C
1974	15.3 C	-0.57 C
1975	15.7 C	-0.22 C
1976	15.2 C	-0.67 C
1977	15.9 C	-0.04 C
1978	16.0 C	+0.13 C
1979	16.6 C	+0.74 C
1980	15.3 C	-0.64 C
1981	15.0 C	-0.87 C
1982	15.6 C	-0.26 C
1983	15.2 C	-0.69 C
1984	14.6 C	-1.32 C
1985	15.5 C	-0.39 C
1986	15.8 C	-0.10 C
1988	16.2 C	+0.32 C
1989	17.0 C	+1.11 C
1990	18.0 C	+2.09 C
1991	17.3 C	+1.41 C
1992	17.0 C	+1.10 C
1993	16.4 C	+0.52 C
1994	18.3 C	+2.38 C
1995	17.2 C	+1.35 C
1996	16.7 C	+0.76 C
1997	17.1 C	+1.16 C
2005	16.2 C	+0.30 C

The annual mean temperature here has risen by 0.3 C (0.2 to 0.5) per decade over 1954 to 2005. In Fahrenheit: 0.6 F (0.3 to 0.9) per decade. The slope is a straight line fitted to 44 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Yokosuka
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.2 to 0.5) per decade	0.6 F (0.3 to 0.9) per decade	1954 to 2005	44	Rise
Mean daily maximum	0.5 C (0.3 to 0.6) per decade	0.8 F (0.5 to 1.1) per decade	1954 to 2005	44	Rise
Mean daily minimum	0.2 C (0.1 to 0.4) per decade	0.4 F (0.2 to 0.7) per decade	1954 to 2005	44	Rise

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

1953 to 2005

Yearly extremes at Yokosuka: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.1 C (106.0 F)	1994	33.9 C (93.0 F)	51
Coldest night (TNn)	-3.9 C (25.0 F)	1967	-1.1 C (30.0 F)	51
Wettest day (Rx1day)	281.2 mm (11.1 in)	1974	111.0 mm (4.4 in)	51
Wettest five days (Rx5day)	318.5 mm (12.5 in)	1974	170.2 mm (6.7 in)	51
Longest dry spell (CDD)	51 days	1973	21 days	51

Hottest day (TXx)

The hottest day of the year at Yokosuka, 1953 to 2005. The record is 41.1 C (106.0 F) in 1994, marked on the chart; the median year is 33.9 C (93.0 F).

Hottest day (TXx) at Yokosuka by year
Year	Hottest day (TXx)
1953	35.6 C (96.1 F)
1954	33.3 C (91.9 F)
1955	33.3 C (91.9 F)
1956	33.3 C (91.9 F)
1957	32.8 C (91.0 F)
1958	32.8 C (91.0 F)
1959	32.8 C (91.0 F)
1960	32.8 C (91.0 F)
1961	33.3 C (91.9 F)
1962	33.3 C (91.9 F)
1963	32.2 C (90.0 F)
1964	33.3 C (91.9 F)
1965	33.3 C (91.9 F)
1966	34.4 C (93.9 F)
1967	33.9 C (93.0 F)
1968	32.2 C (90.0 F)
1969	34.4 C (93.9 F)
1970	32.8 C (91.0 F)
1971	32.8 C (91.0 F)
1972	33.3 C (91.9 F)
1973	33.3 C (91.9 F)
1974	32.8 C (91.0 F)
1975	33.9 C (93.0 F)
1976	32.8 C (91.0 F)
1977	33.9 C (93.0 F)
1978	35.6 C (96.1 F)
1979	33.9 C (93.0 F)
1980	32.2 C (90.0 F)
1981	32.8 C (91.0 F)
1982	32.2 C (90.0 F)
1983	33.9 C (93.0 F)
1984	37.2 C (99.0 F)
1985	35.0 C (95.0 F)
1986	36.1 C (97.0 F)
1987	37.8 C (100.0 F)
1988	33.9 C (93.0 F)
1989	35.0 C (95.0 F)
1990	37.2 C (99.0 F)
1991	37.8 C (100.0 F)
1992	37.8 C (100.0 F)
1993	36.1 C (97.0 F)
1994	41.1 C (106.0 F)
1995	40.0 C (104.0 F)
1996	37.8 C (100.0 F)
1997	33.9 C (93.0 F)
1998	33.9 C (93.0 F)
2001	31.7 C (89.1 F)
2002	35.6 C (96.1 F)
2003	32.8 C (91.0 F)
2004	34.4 C (93.9 F)
2005	33.9 C (93.0 F)

Coldest night (TNn)

The coldest night of the year at Yokosuka, 1953 to 2005. The record is -3.9 C (25.0 F) in 1967, marked on the chart; the median year is -1.1 C (30.0 F).

Coldest night (TNn) at Yokosuka by year
Year	Coldest night (TNn)
1953	0.0 C (32.0 F)
1954	-0.6 C (30.9 F)
1955	-2.2 C (28.0 F)
1956	0.0 C (32.0 F)
1957	-1.7 C (28.9 F)
1958	-0.6 C (30.9 F)
1959	-1.7 C (28.9 F)
1960	-2.2 C (28.0 F)
1961	-1.1 C (30.0 F)
1962	0.0 C (32.0 F)
1963	-2.8 C (27.0 F)
1964	-0.6 C (30.9 F)
1965	-1.7 C (28.9 F)
1966	-1.7 C (28.9 F)
1967	-3.9 C (25.0 F)
1968	-1.7 C (28.9 F)
1969	-1.1 C (30.0 F)
1970	-3.9 C (25.0 F)
1971	-1.7 C (28.9 F)
1972	0.0 C (32.0 F)
1973	-1.7 C (28.9 F)
1974	-1.7 C (28.9 F)
1975	-2.2 C (28.0 F)
1976	-3.3 C (26.1 F)
1977	-3.3 C (26.1 F)
1978	-2.2 C (28.0 F)
1979	0.0 C (32.0 F)
1980	-1.1 C (30.0 F)
1981	-3.9 C (25.0 F)
1982	-2.2 C (28.0 F)
1983	-1.1 C (30.0 F)
1984	-3.9 C (25.0 F)
1985	-2.8 C (27.0 F)
1986	-2.2 C (28.0 F)
1987	0.0 C (32.0 F)
1988	0.0 C (32.0 F)
1989	0.0 C (32.0 F)
1990	-1.1 C (30.0 F)
1991	-1.1 C (30.0 F)
1992	0.0 C (32.0 F)
1993	1.1 C (34.0 F)
1994	-1.1 C (30.0 F)
1995	-1.1 C (30.0 F)
1996	-2.2 C (28.0 F)
1997	-1.1 C (30.0 F)
1998	0.6 C (33.1 F)
2001	0.0 C (32.0 F)
2002	1.1 C (34.0 F)
2003	0.6 C (33.1 F)
2004	1.1 C (34.0 F)
2005	0.6 C (33.1 F)

Wettest day (Rx1day)

The wettest day of the year at Yokosuka, 1953 to 2005. The record is 281.2 mm (11.1 in) in 1974, marked on the chart; the median year is 111.0 mm (4.4 in).

Wettest day (Rx1day) at Yokosuka by year
Year	Wettest day (Rx1day)
1953	85.3 mm (3.4 in)
1954	94.0 mm (3.7 in)
1955	87.9 mm (3.5 in)
1956	82.8 mm (3.3 in)
1957	187.7 mm (7.4 in)
1958	184.7 mm (7.3 in)
1959	93.5 mm (3.7 in)
1960	85.9 mm (3.4 in)
1961	199.1 mm (7.8 in)
1962	84.3 mm (3.3 in)
1963	98.0 mm (3.9 in)
1964	47.5 mm (1.9 in)
1965	114.6 mm (4.5 in)
1966	239.8 mm (9.4 in)
1967	45.7 mm (1.8 in)
1968	104.1 mm (4.1 in)
1969	94.2 mm (3.7 in)
1970	156.2 mm (6.1 in)
1971	88.6 mm (3.5 in)
1972	119.1 mm (4.7 in)
1973	128.5 mm (5.1 in)
1974	281.2 mm (11.1 in)
1975	174.2 mm (6.9 in)
1976	133.1 mm (5.2 in)
1977	170.2 mm (6.7 in)
1978	84.8 mm (3.3 in)
1979	103.4 mm (4.1 in)
1980	73.7 mm (2.9 in)
1981	237.7 mm (9.4 in)
1982	131.3 mm (5.2 in)
1983	80.3 mm (3.2 in)
1984	95.8 mm (3.8 in)
1985	105.2 mm (4.1 in)
1986	148.3 mm (5.8 in)
1987	58.7 mm (2.3 in)
1988	139.4 mm (5.5 in)
1989	199.6 mm (7.9 in)
1990	210.8 mm (8.3 in)
1991	138.7 mm (5.5 in)
1992	88.4 mm (3.5 in)
1993	124.5 mm (4.9 in)
1994	164.8 mm (6.5 in)
1995	111.0 mm (4.4 in)
1996	146.3 mm (5.8 in)
1997	113.8 mm (4.5 in)
1998	60.5 mm (2.4 in)
2001	31.2 mm (1.2 in)
2002	77.5 mm (3.1 in)
2003	177.3 mm (7.0 in)
2004	175.5 mm (6.9 in)
2005	74.9 mm (2.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Yokosuka, 1953 to 2005. The record is 318.5 mm (12.5 in) in 1974, marked on the chart; the median year is 170.2 mm (6.7 in).

Wettest five days (Rx5day) at Yokosuka by year
Year	Wettest five days (Rx5day)
1953	140.2 mm (5.5 in)
1954	170.2 mm (6.7 in)
1955	218.7 mm (8.6 in)
1956	123.5 mm (4.9 in)
1957	257.0 mm (10.1 in)
1958	244.0 mm (9.6 in)
1959	111.8 mm (4.4 in)
1960	119.2 mm (4.7 in)
1961	284.0 mm (11.2 in)
1962	114.0 mm (4.5 in)
1963	227.6 mm (9.0 in)
1964	103.4 mm (4.1 in)
1965	169.2 mm (6.7 in)
1966	302.8 mm (11.9 in)
1967	74.4 mm (2.9 in)
1968	225.2 mm (8.9 in)
1969	145.8 mm (5.7 in)
1970	179.1 mm (7.1 in)
1971	135.3 mm (5.3 in)
1972	212.6 mm (8.4 in)
1973	161.8 mm (6.4 in)
1974	318.5 mm (12.5 in)
1975	243.8 mm (9.6 in)
1976	167.7 mm (6.6 in)
1977	186.7 mm (7.4 in)
1978	95.5 mm (3.8 in)
1979	164.4 mm (6.5 in)
1980	150.6 mm (5.9 in)
1981	238.2 mm (9.4 in)
1982	257.5 mm (10.1 in)
1983	201.7 mm (7.9 in)
1984	172.5 mm (6.8 in)
1985	167.6 mm (6.6 in)
1986	164.3 mm (6.5 in)
1987	88.4 mm (3.5 in)
1988	171.5 mm (6.8 in)
1989	291.9 mm (11.5 in)
1990	278.1 mm (10.9 in)
1991	214.0 mm (8.4 in)
1992	137.9 mm (5.4 in)
1993	161.4 mm (6.4 in)
1994	183.8 mm (7.2 in)
1995	161.8 mm (6.4 in)
1996	251.0 mm (9.9 in)
1997	153.9 mm (6.1 in)
1998	101.7 mm (4.0 in)
2001	49.2 mm (1.9 in)
2002	111.8 mm (4.4 in)
2003	255.5 mm (10.1 in)
2004	226.8 mm (8.9 in)
2005	180.8 mm (7.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Yokosuka, 1953 to 2005. The record is 51 days in 1973, marked on the chart; the median year is 21 days.

Longest dry spell (CDD) at Yokosuka by year
Year	Longest dry spell (CDD)
1953	11 days
1954	18 days
1955	18 days
1956	24 days
1957	28 days
1958	16 days
1959	14 days
1960	22 days
1961	20 days
1962	20 days
1963	27 days
1964	29 days
1965	20 days
1966	28 days
1967	16 days
1968	25 days
1969	22 days
1970	29 days
1971	22 days
1972	17 days
1973	51 days
1974	16 days
1975	19 days
1976	32 days
1977	20 days
1978	15 days
1979	28 days
1980	18 days
1981	18 days
1982	16 days
1983	25 days
1984	18 days
1985	24 days
1986	16 days
1987	18 days
1988	26 days
1989	26 days
1990	21 days
1991	24 days
1992	28 days
1993	19 days
1994	21 days
1995	38 days
1996	20 days
1997	26 days
1998	29 days
2001	18 days
2002	23 days
2003	19 days
2004	19 days
2005	27 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

49 years, 1954 to 2005

A day with at least 116.7 mm (4.6 in) of rain is expected about once in 2 years. A day with at least 309.2 mm (12.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Yokosuka: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	116.7 mm (4.6 in)
5 years	165.4 mm (6.5 in)
10 years	198.7 mm (7.8 in)
25 years	242.2 mm (9.5 in)
50 years	275.4 mm (10.8 in)	Longer than the 49 years of record
100 years	309.2 mm (12.2 in)	Longer than the 49 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, 49 years of values from 1954 to 2005.

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: 281.2 mm (11.1 in) in 1974; 239.8 mm (9.4 in) in 1966; 237.7 mm (9.4 in) in 1981.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Yokosuka, at 1984. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1984 ran 0.4 C (0.8 F) higher than in the years before (likely change).

Suspected changes in the annual mean temperature at Yokosuka, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1984	+0.4	+0.8	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

Data for Yokosuka standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Yokosuka 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).