Suwa Threshold Days by Year (JA000047620)

14 fixed thresholds counted per year at Suwa (JA000047620): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Suwa Thresholds

Suwa: days with a maximum temperature at or above 30 C (86 F) in 70 years, most in 2025 with 56.
Suwa: days with a maximum temperature at or below 0 C (32 F) in 68 years, most in 1984 with 29.
Suwa: days with a maximum temperature at or above 90 F (32.2 C) in 61 years, most in 1994 with 34.
Suwa: days with 10 mm (0.39 in) or more of precipitation in 53 years, most in 1953 with 57.
14 fixed thresholds have at least one qualifying day at Suwa.

Days at or above 30 C (86 F)

70 years with a qualifying day

Days per year at Suwa with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 56 in 2025.

Days at or above 30 C (86 F) per year at Suwa
Year	Days	Decade average
1951	22	15.8
1952	15	15.8
1953	12	15.8
1954	11	15.8
1955	19	15.8
1956	22	15.8
1957	9	15.8
1958	15	15.8
1959	17	15.8
1960	22	24.7
1961	33	24.7
1962	27	24.7
1963	20	24.7
1964	35	24.7
1965	25	24.7
1966	27	24.7
1967	28	24.7
1968	15	24.7
1969	15	24.7
1970	19	20.3
1971	23	20.3
1972	18	20.3
1973	34	20.3
1974	8	20.3
1975	15	20.3
1976	6	20.3
1977	19	20.3
1978	41	20.3
1979	20	20.3
1980	2	18.4
1981	14	18.4
1982	2	18.4
1983	26	18.4
1984	29	18.4
1985	40	18.4
1986	23	18.4
1987	27	18.4
1988	11	18.4
1989	10	18.4
1992	27	27.3
1993	6	27.3
1994	54	27.3
1995	34	27.3
1996	32	27.3
1997	25	27.3
1998	20	27.3
1999	20	27.3
2000	39	25.8
2002	43	25.8
2003	22	25.8
2004	24	25.8
2005	19	25.8
2006	21	25.8
2007	25	25.8
2008	28	25.8
2009	11	25.8
2010	46	31.7
2011	31	31.7
2012	31	31.7
2013	27	31.7
2014	24	31.7
2015	29	31.7
2016	31	31.7
2017	27	31.7
2018	41	31.7
2019	30	31.7
2021	24	35.8
2022	31	35.8
2025	56	35.8
2026	32	35.8

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

First to last qualifying date each year at Suwa
Year	First date	Last date
1951	1951-07-22	1951-08-27
1952	1952-07-24	1952-08-30
1953	1953-07-25	1953-08-23
1954	1954-08-07	1954-08-23
1955	1955-07-02	1955-08-11
1956	1956-07-13	1956-09-04
1957	1957-07-29	1957-08-27
1958	1958-07-11	1958-09-06
1959	1959-07-05	1959-08-29
1960	1960-07-14	1960-08-24
1961	1961-07-07	1961-09-06
1962	1962-07-21	1962-08-29
1963	1963-06-21	1963-08-27
1964	1964-07-02	1964-08-31
1965	1965-07-16	1965-08-28
1966	1966-06-26	1966-09-11
1967	1967-07-15	1967-08-26
1968	1968-07-18	1968-08-20
1969	1969-05-10	1969-09-01
1970	1970-07-20	1970-09-08
1971	1971-06-26	1971-08-29
1972	1972-07-19	1972-09-08
1973	1973-07-06	1973-09-01
1974	1974-08-06	1974-08-22
1975	1975-07-16	1975-09-02
1976	1976-07-25	1976-08-23
1977	1977-07-14	1977-09-12
1978	1978-06-18	1978-08-29
1979	1979-06-18	1979-08-19
1980	1980-07-21	1980-07-22
1981	1981-07-16	1981-09-01
1982	1982-08-23	1982-08-25
1983	1983-07-26	1983-09-06
1984	1984-07-03	1984-09-04
1985	1985-07-18	1985-09-06
1986	1986-07-18	1986-09-04
1987	1987-06-05	1987-08-30
1988	1988-07-09	1988-08-28
1989	1989-07-19	1989-08-23
1992	1992-07-20	1992-09-04
1993	1993-07-29	1993-08-25
1994	1994-06-27	1994-09-11
1995	1995-07-10	1995-08-29
1996	1996-07-03	1996-09-01
1997	1997-06-24	1997-09-03
1998	1998-06-18	1998-08-25
1999	1999-07-22	1999-09-12
2000	2000-05-26	2000-09-08
2002	2002-07-04	2002-09-05
2003	2003-08-01	2003-09-13
2004	2004-07-03	2004-08-19
2005	2005-06-25	2005-09-03
2006	2006-06-29	2006-09-10
2007	2007-06-28	2007-09-21
2008	2008-07-05	2008-08-16
2009	2009-06-27	2009-08-18
2010	2010-07-01	2010-09-12
2011	2011-06-22	2011-09-19
2012	2012-07-17	2012-09-16
2013	2013-07-08	2013-09-13
2014	2014-06-01	2014-08-22
2015	2015-05-30	2015-08-22
2016	2016-07-01	2016-08-26
2017	2017-05-21	2017-08-29
2018	2018-06-25	2018-08-29
2019	2019-05-26	2019-09-23
2021	2021-07-17	2021-08-30
2022	2022-06-24	2022-08-31
2025	2025-06-17	2025-09-17
2026	2026-07-09	2026-09-02

Every Fixed Threshold

Fixed thresholds at Suwa
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	70	56	2025	32
35 C (95 F): Days	3	4	1994	1
90 F (32.2 C): Days	61	34	1994	13
0 C (32 F): Ice days (max	68	29	1984	5
0 C (32 F): Frost days (min	41	141	1970	66
-10 C (14 F): Days with min	40	54	1984	1
-20 C (-4 F): Days with min	2	2	1984	2
20 C (68 F): Tropical nights (min	41	73	2025	58
25 C (77 F): Days with min	1	0	n/a	1
10 mm (0.39 in): Days with 10 mm or more rain	53	57	1953	39
25 mm (0.98 in): Days with 25 mm or more rain	53	24	1989	29
50 mm (1.97 in): Days with 50 mm or more rain	51	7	1959	21
100 mm (3.94 in): Days with 100 mm or more rain	15	1	1955	16
200 mm (7.87 in): Days with 200 mm or more rain	1	0	n/a	8

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 Suwa 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).

Suwa Threshold Days by Year (JA000047620)

Key Facts for Suwa Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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