Sun Rvr 4 S Threshold Days by Year

18 fixed thresholds counted per year at Sun Rvr 4 S (USC00248021): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sun Rvr 4 S Thresholds

Sun Rvr 4 S: days with 10 mm (0.39 in) or more of precipitation in 72 years, most in 1975 with 16.
Sun Rvr 4 S: days with a maximum temperature at or above 30 C (86 F) in 63 years, most in 1988 with 55.
Sun Rvr 4 S: days with a maximum temperature at or above 90 F (32.2 C) in 63 years, most in 2003 with 31.
Sun Rvr 4 S: days with a maximum temperature at or below 0 C (32 F) in 63 years, most in 1996 with 63.
18 fixed thresholds have at least one qualifying day at Sun Rvr 4 S.

Days at or above 30 C (86 F)

63 years with a qualifying day

Days per year at Sun Rvr 4 S with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 55 in 1988.

Days at or above 30 C (86 F) per year at Sun Rvr 4 S
Year	Days	Decade average
1954	30	30.2
1955	27	30.2
1956	29	30.2
1957	27	30.2
1958	35	30.2
1959	33	30.2
1960	36	32.5
1961	47	32.5
1962	20	32.5
1963	38	32.5
1964	31	32.5
1965	13	32.5
1966	41	32.5
1967	47	32.5
1968	18	32.5
1969	34	32.5
1970	44	26
1973	32	26
1974	29	26
1975	16	26
1976	20	26
1977	15	26
1980	18	31.5
1981	32	31.5
1982	26	31.5
1983	30	31.5
1984	45	31.5
1985	30	31.5
1986	32	31.5
1987	26	31.5
1988	55	31.5
1989	21	31.5
1990	38	27
1991	35	27
1992	26	27
1993	5	27
1994	38	27
1995	14	27
1996	33	27
1997	17	27
1998	40	27
1999	24	27
2000	41	38.7
2001	48	38.7
2002	22	38.7
2003	53	38.7
2004	26	38.7
2005	38	38.7
2006	51	38.7
2008	34	38.7
2009	35	38.7
2010	23	34.4
2012	46	34.4
2013	45	34.4
2014	27	34.4
2017	45	34.4
2018	30	34.4
2019	25	34.4
2020	36	39.6
2021	48	39.6
2022	51	39.6
2023	25	39.6
2026	38	39.6

For each year, a bar from the first to the last day at Sun Rvr 4 S meeting 30 C (86 F).

First to last qualifying date each year at Sun Rvr 4 S
Year	First date	Last date
1954	1954-05-18	1954-09-02
1955	1955-07-14	1955-09-06
1956	1956-06-01	1956-09-19
1957	1957-06-03	1957-09-07
1958	1958-05-20	1958-09-11
1959	1959-06-12	1959-09-13
1960	1960-05-11	1960-09-03
1961	1961-05-26	1961-08-29
1962	1962-04-19	1962-08-26
1963	1963-05-29	1963-09-30
1964	1964-05-19	1964-08-18
1965	1965-06-11	1965-08-12
1966	1966-05-03	1966-09-23
1967	1967-05-21	1967-09-29
1968	1968-06-19	1968-09-11
1969	1969-05-24	1969-09-12
1970	1970-06-02	1970-08-31
1973	1973-05-15	1973-09-11
1974	1974-06-12	1974-08-05
1975	1975-07-04	1975-08-27
1976	1976-06-30	1976-09-05
1977	1977-06-01	1977-09-07
1980	1980-04-20	1980-10-07
1981	1981-06-26	1981-09-18
1982	1982-07-19	1982-09-09
1983	1983-07-05	1983-09-01
1984	1984-05-30	1984-09-18
1985	1985-06-07	1985-08-25
1986	1986-05-27	1986-08-29
1987	1987-04-27	1987-09-02
1988	1988-05-16	1988-09-06
1989	1989-06-19	1989-09-26
1990	1990-06-23	1990-09-25
1991	1991-07-03	1991-10-11
1992	1992-04-29	1992-10-01
1993	1993-05-11	1993-08-10
1994	1994-04-17	1994-09-27
1995	1995-07-08	1995-09-03
1996	1996-06-07	1996-08-30
1997	1997-05-15	1997-09-02
1998	1998-07-08	1998-09-16
1999	1999-05-25	1999-08-30
2000	2000-06-10	2000-09-17
2001	2001-05-12	2001-09-25
2002	2002-06-25	2002-09-15
2003	2003-05-25	2003-09-07
2004	2004-06-05	2004-09-02
2005	2005-06-21	2005-09-08
2006	2006-05-16	2006-09-06
2008	2008-05-17	2008-10-01
2009	2009-05-30	2009-09-24
2010	2010-06-28	2010-10-02
2012	2012-04-23	2012-09-18
2013	2013-05-13	2013-09-16
2014	2014-05-23	2014-09-25
2017	2017-06-01	2017-09-13
2018	2018-06-10	2018-09-08
2019	2019-07-13	2019-09-16
2020	2020-06-24	2020-09-13
2021	2021-06-03	2021-08-31
2022	2022-06-18	2022-09-08
2023	2023-07-01	2023-09-17
2026	2026-05-14	2026-09-02

Every Fixed Threshold

Fixed thresholds at Sun Rvr 4 S
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	63	55	1988	38
35 C (95 F): Days	49	13	1985	7
40 C (104 F): Days	1	1	2006	1
90 F (32.2 C): Days	63	31	2003	21
100 F (37.8 C): Days	13	3	2002	1
110 F (43.3 C): Days	1	1	2006	1
0 C (32 F): Ice days (max	63	63	1996	7
0 C (32 F): Frost days (min	63	189	2019	83
-10 C (14 F): Days with min	63	84	2019	21
-20 C (-4 F): Days with min	63	46	1996	7
-30 C (-22 F): Days with min	59	17	1996	1
-40 C (-40 F): Days with min	14	3	1969	1
20 C (68 F): Tropical nights (min	5	2	1973	1
10 mm (0.39 in): Days with 10 mm or more rain	72	16	1975	11
25 mm (0.98 in): Days with 25 mm or more rain	48	4	2008	4
50 mm (1.97 in): Days with 50 mm or more rain	8	2	2006	2
10 cm (3.9 in): Days with 10 cm or more snowfall	54	8	1955	2
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1960	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 Sun Rvr 4 S 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). Threshold counts are computed by this site.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).

Sun Rvr 4 S Threshold Days by Year

Key Facts for Sun Rvr 4 S Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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