Yokosuka Threshold Days by Year (JAW00043323)

15 fixed thresholds counted per year at Yokosuka (JAW00043323): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Yokosuka Thresholds

Yokosuka: days with a maximum temperature at or above 30 C (86 F) in 49 years, most in 1994 with 86.
Yokosuka: days with a maximum temperature at or above 90 F (32.2 C) in 49 years, most in 1994 with 65.
Yokosuka: nights with a minimum temperature at or above 20 C (68 F) in 49 years, most in 1994 with 125.
Yokosuka: nights with a minimum temperature at or above 25 C (77 F) in 49 years, most in 1994 with 56.
15 fixed thresholds have at least one qualifying day at Yokosuka.

Days at or above 30 C (86 F)

49 years with a qualifying day

Days per year at Yokosuka with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 86 in 1994.

Days at or above 30 C (86 F) per year at Yokosuka
Year	Days	Decade average
1954	18	21.3
1955	28	21.3
1956	25	21.3
1957	15	21.3
1958	18	21.3
1959	24	21.3
1960	22	28.5
1961	41	28.5
1962	24	28.5
1963	19	28.5
1964	32	28.5
1965	29	28.5
1966	27	28.5
1967	39	28.5
1968	22	28.5
1969	30	28.5
1970	31	34
1971	29	34
1972	22	34
1973	43	34
1974	26	34
1975	51	34
1976	19	34
1977	29	34
1978	52	34
1979	38	34
1980	13	39.7
1981	33	39.7
1982	18	39.7
1983	30	39.7
1984	55	39.7
1985	58	39.7
1986	50	39.7
1987	50	39.7
1988	35	39.7
1989	55	39.7
1990	78	55.6
1991	59	55.6
1992	56	55.6
1993	34	55.6
1994	86	55.6
1995	70	55.6
1996	53	55.6
1997	28	55.6
1998	36	55.6
2002	28	26.3
2003	14	26.3
2004	32	26.3
2005	31	26.3

For each year, a bar from the first to the last day at Yokosuka meeting 30 C (86 F).

First to last qualifying date each year at Yokosuka
Year	First date	Last date
1954	1954-08-05	1954-09-11
1955	1955-06-29	1955-09-14
1956	1956-06-18	1956-09-09
1957	1957-07-28	1957-08-27
1958	1958-05-31	1958-09-18
1959	1959-07-07	1959-09-19
1960	1960-07-15	1960-09-20
1961	1961-07-07	1961-09-24
1962	1962-07-22	1962-09-19
1963	1963-07-01	1963-08-27
1964	1964-07-03	1964-09-05
1965	1965-06-30	1965-08-25
1966	1966-07-20	1966-09-11
1967	1967-07-03	1967-08-29
1968	1968-07-18	1968-08-24
1969	1969-07-22	1969-09-16
1970	1970-07-18	1970-09-15
1971	1971-07-08	1971-08-30
1972	1972-07-01	1972-09-08
1973	1973-07-06	1973-09-04
1974	1974-07-09	1974-09-03
1975	1975-07-18	1975-09-22
1976	1976-07-17	1976-09-10
1977	1977-07-02	1977-09-20
1978	1978-07-03	1978-09-17
1979	1979-06-24	1979-10-01
1980	1980-06-16	1980-09-11
1981	1981-06-23	1981-09-27
1982	1982-07-12	1982-08-29
1983	1983-07-25	1983-09-13
1984	1984-06-19	1984-09-30
1985	1985-05-02	1985-09-10
1986	1986-06-20	1986-09-22
1987	1987-05-21	1987-10-03
1988	1988-05-02	1988-09-16
1989	1989-06-04	1989-09-28
1990	1990-05-28	1990-10-06
1991	1991-06-04	1991-10-04
1992	1992-06-03	1992-10-04
1993	1993-06-15	1993-09-11
1994	1994-05-23	1994-10-13
1995	1995-06-28	1995-10-04
1996	1996-05-31	1996-09-20
1997	1997-06-21	1997-09-19
1998	1998-06-20	1998-09-16
2002	2002-07-09	2002-08-30
2003	2003-06-21	2003-09-15
2004	2004-07-07	2004-09-30
2005	2005-06-27	2005-09-13

Every Fixed Threshold

Fixed thresholds at Yokosuka
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	49	86	1994	31
35 C (95 F): Days	14	49	1994	1
40 C (104 F): Days	2	3	1994	1
90 F (32.2 C): Days	49	65	1994	4
100 F (37.8 C): Days	6	15	1994	1
0 C (32 F): Ice days (max	1	1	1967	1
0 C (32 F): Frost days (min	43	41	1984	3
20 C (68 F): Tropical nights (min	49	125	1994	104
25 C (77 F): Days with min	49	56	1994	23
10 mm (0.39 in): Days with 10 mm or more rain	49	66	1956	33
25 mm (0.98 in): Days with 25 mm or more rain	49	29	1980	11
50 mm (1.97 in): Days with 50 mm or more rain	47	11	1985	3
100 mm (3.94 in): Days with 100 mm or more rain	29	4	1996	3
200 mm (7.87 in): Days with 200 mm or more rain	4	1	1966	1
10 cm (3.9 in): Days with 10 cm or more snowfall	7	2	1967	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

Download the Data

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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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

Yokosuka Threshold Days by Year (JAW00043323)

Key Facts for Yokosuka Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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