Rosario Threshold Days by Year (MXN00025078)

12 fixed thresholds counted per year at Rosario (MXN00025078): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rosario Thresholds

Rosario: days with a maximum temperature at or above 30 C (86 F) in 47 years, most in 1980 with 339.
Rosario: days with a maximum temperature at or above 35 C (95 F) in 47 years, most in 1982 with 139.
Rosario: days with a maximum temperature at or above 90 F (32.2 C) in 47 years, most in 1966 with 275.
Rosario: nights with a minimum temperature at or above 20 C (68 F) in 47 years, most in 1990 with 195.
12 fixed thresholds have at least one qualifying day at Rosario.

Days at or above 30 C (86 F)

47 years with a qualifying day

Days per year at Rosario with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 339 in 1980.

Days at or above 30 C (86 F) per year at Rosario
Year	Days	Decade average
1964	299	307
1965	306	307
1966	316	307
1967	321	307
1968	295	307
1969	305	307
1970	310	314.3
1971	316	314.3
1972	320	314.3
1973	302	314.3
1974	327	314.3
1975	281	314.3
1976	312	314.3
1977	324	314.3
1978	327	314.3
1979	324	314.3
1980	339	309.4
1981	322	309.4
1982	319	309.4
1983	258	309.4
1984	321	309.4
1985	306	309.4
1986	325	309.4
1987	295	309.4
1988	321	309.4
1989	288	309.4
1990	319	302.6
1991	306	302.6
1992	253	302.6
1994	338	302.6
1996	328	302.6
1997	287	302.6
1998	302	302.6
1999	288	302.6
2000	321	307.4
2001	302	307.4
2002	328	307.4
2003	327	307.4
2004	276	307.4
2005	287	307.4
2006	326	307.4
2007	306	307.4
2008	319	307.4
2009	282	307.4
2010	252	295
2011	310	295
2012	323	295

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

First to last qualifying date each year at Rosario
Year	First date	Last date
1964	1964-01-01	1964-12-21
1965	1965-01-03	1965-12-31
1966	1966-01-05	1966-12-26
1967	1967-01-04	1967-12-24
1968	1968-01-01	1968-12-25
1969	1969-01-02	1969-12-26
1970	1970-01-22	1970-12-30
1971	1971-01-01	1971-12-30
1972	1972-01-01	1972-12-26
1973	1973-01-14	1973-12-31
1974	1974-01-01	1974-12-22
1975	1975-01-05	1975-12-22
1976	1976-01-08	1976-12-28
1977	1977-01-07	1977-12-31
1978	1978-01-01	1978-12-31
1979	1979-01-01	1979-12-31
1980	1980-01-01	1980-12-31
1981	1981-01-01	1981-12-30
1982	1982-01-07	1982-12-22
1983	1983-01-05	1983-12-31
1984	1984-01-05	1984-12-31
1985	1985-01-04	1985-12-31
1986	1986-01-01	1986-12-31
1987	1987-01-02	1987-12-31
1988	1988-01-01	1988-12-26
1989	1989-01-02	1989-12-26
1990	1990-01-02	1990-12-31
1991	1991-01-01	1991-12-31
1992	1992-01-05	1992-12-30
1994	1994-01-01	1994-12-25
1996	1996-01-06	1996-12-31
1997	1997-01-01	1997-12-31
1998	1998-01-01	1998-12-31
1999	1999-01-01	1999-12-31
2000	2000-01-06	2000-12-29
2001	2001-01-01	2001-12-31
2002	2002-01-06	2002-12-31
2003	2003-01-01	2003-12-31
2004	2004-01-01	2004-12-31
2005	2005-01-03	2005-12-28
2006	2006-01-01	2006-12-30
2007	2007-01-01	2007-12-24
2008	2008-01-01	2008-12-31
2009	2009-01-01	2009-12-31
2010	2010-01-01	2010-12-12
2011	2011-01-02	2011-12-31
2012	2012-01-01	2012-12-30

Every Fixed Threshold

Fixed thresholds at Rosario
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	47	339	1980	323
35 C (95 F): Days	47	139	1982	51
40 C (104 F): Days	8	5	1982	1
90 F (32.2 C): Days	47	275	1966	156
100 F (37.8 C): Days	42	35	1987	4
20 C (68 F): Tropical nights (min	47	195	1990	192
25 C (77 F): Days with min	47	71	1987	34
10 mm (0.39 in): Days with 10 mm or more rain	47	34	1985	24
25 mm (0.98 in): Days with 25 mm or more rain	47	18	1985	14
50 mm (1.97 in): Days with 50 mm or more rain	47	9	1970	7
100 mm (3.94 in): Days with 100 mm or more rain	22	4	1970	3
200 mm (7.87 in): Days with 200 mm or more rain	4	1	1965	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1964.

Download the Data

Data for Rosario 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).

Rosario Threshold Days by Year (MXN00025078)

Key Facts for Rosario Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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