Nagano Threshold Days by Year (JA000047610)

14 fixed thresholds counted per year at Nagano (JA000047610): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Nagano Thresholds

Nagano: days with a maximum temperature at or above 30 C (86 F) in 64 years, most in 2025 with 71.
Nagano: days with a maximum temperature at or above 90 F (32.2 C) in 64 years, most in 2025 with 50.
Nagano: days with a maximum temperature at or below 0 C (32 F) in 60 years, most in 1984 with 34.
Nagano: days with 10 mm (0.39 in) or more of precipitation in 59 years, most in 1953 with 45.
14 fixed thresholds have at least one qualifying day at Nagano.

Days at or above 30 C (86 F)

64 years with a qualifying day

Days per year at Nagano with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 2025.

Days at or above 30 C (86 F) per year at Nagano
Year	Days	Decade average
1951	47	34.8
1952	33	34.8
1953	19	34.8
1954	39	34.8
1955	43	34.8
1956	38	34.8
1957	26	34.8
1958	32	34.8
1959	36	34.8
1960	33	40.2
1961	56	40.2
1962	51	40.2
1963	37	40.2
1964	40	40.2
1965	33	40.2
1966	42	40.2
1967	45	40.2
1968	32	40.2
1969	33	40.2
1970	41	39
1971	29	39
1972	37	39
1973	50	39
1974	37	39
1975	43	39
1976	24	39
1977	34	39
1978	61	39
1979	34	39
1980	20	35
1981	35	35
1982	29	35
1983	32	35
1984	52	35
1985	50	35
1986	35	35
1987	44	35
1988	23	35
1989	30	35
1990	52	40.4
1991	33	40.4
1992	38	40.4
1993	13	40.4
1994	64	40.4
1996	45	40.4
1997	37	40.4
1998	37	40.4
1999	45	40.4
2000	65	47.6
2002	56	47.6
2003	30	47.6
2004	45	47.6
2006	46	47.6
2007	54	47.6
2008	47	47.6
2009	38	47.6
2010	62	56
2011	62	56
2012	59	56
2016	49	56
2018	61	56
2019	43	56
2025	71	59
2026	47	59

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

First to last qualifying date each year at Nagano
Year	First date	Last date
1951	1951-05-30	1951-08-31
1952	1952-07-15	1952-09-04
1953	1953-07-02	1953-09-14
1954	1954-07-25	1954-09-16
1955	1955-06-23	1955-08-30
1956	1956-06-04	1956-09-10
1957	1957-07-14	1957-08-28
1958	1958-06-25	1958-09-10
1959	1959-05-04	1959-09-18
1960	1960-07-03	1960-09-15
1961	1961-05-27	1961-10-06
1962	1962-05-22	1962-09-20
1963	1963-04-17	1963-08-28
1964	1964-07-01	1964-08-28
1965	1965-07-15	1965-09-01
1966	1966-05-14	1966-09-25
1967	1967-06-01	1967-09-08
1968	1968-07-18	1968-08-29
1969	1969-05-10	1969-09-15
1970	1970-05-26	1970-09-09
1971	1971-07-03	1971-08-29
1972	1972-06-11	1972-09-07
1973	1973-07-03	1973-09-03
1974	1974-05-18	1974-09-03
1975	1975-07-07	1975-09-20
1976	1976-07-09	1976-09-10
1977	1977-06-13	1977-09-12
1978	1978-05-26	1978-09-10
1979	1979-06-10	1979-09-04
1980	1980-05-12	1980-09-12
1981	1981-07-08	1981-09-02
1982	1982-05-13	1982-09-01
1983	1983-04-26	1983-09-06
1984	1984-06-07	1984-09-03
1985	1985-07-17	1985-09-07
1986	1986-06-02	1986-09-21
1987	1987-05-21	1987-09-15
1988	1988-05-20	1988-08-28
1989	1989-06-04	1989-09-15
1990	1990-06-11	1990-09-11
1991	1991-05-24	1991-09-06
1992	1992-06-03	1992-09-09
1993	1993-05-29	1993-09-04
1994	1994-06-30	1994-09-30
1996	1996-05-30	1996-09-01
1997	1997-05-06	1997-09-03
1998	1998-04-22	1998-10-18
1999	1999-06-06	1999-10-02
2000	2000-05-26	2000-09-16
2002	2002-06-07	2002-09-11
2003	2003-05-29	2003-09-18
2004	2004-04-22	2004-09-21
2006	2006-05-09	2006-09-18
2007	2007-05-09	2007-09-28
2008	2008-06-18	2008-09-20
2009	2009-05-21	2009-09-07
2010	2010-05-05	2010-09-11
2011	2011-05-21	2011-09-18
2012	2012-06-15	2012-09-18
2016	2016-05-24	2016-09-27
2018	2018-05-16	2018-10-06
2019	2019-05-25	2019-10-02
2025	2025-05-21	2025-09-17
2026	2026-05-18	2026-09-14

Every Fixed Threshold

Fixed thresholds at Nagano
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	64	71	2025	47
35 C (95 F): Days	43	22	1994	5
90 F (32.2 C): Days	64	50	2025	31
100 F (37.8 C): Days	1	2	1994	2
0 C (32 F): Ice days (max	60	34	1984	4
0 C (32 F): Frost days (min	41	130	1970	61
-10 C (14 F): Days with min	32	12	1977	1
20 C (68 F): Tropical nights (min	41	87	2025	65
25 C (77 F): Days with min	15	4	2025	10
10 mm (0.39 in): Days with 10 mm or more rain	59	45	1953	25
25 mm (0.98 in): Days with 25 mm or more rain	59	12	1952	20
50 mm (1.97 in): Days with 50 mm or more rain	37	4	1970	17
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1982	8
200 mm (7.87 in): Days with 200 mm or more rain	1	0	n/a	3

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1951.

Download the Data

Data for Nagano 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Nagano Threshold Days by Year (JA000047610)

Key Facts for Nagano Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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