Rosso Threshold Days by Year (MR000001489)

13 fixed thresholds counted per year at Rosso (MR000001489): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rosso Thresholds

Rosso: days with 10 mm (0.39 in) or more of precipitation in 34 years, most in 1952 with 19.
Rosso: nights with a minimum temperature at or above 20 C (68 F) in 33 years, most in 1979 with 227.
Rosso: nights with a minimum temperature at or above 25 C (77 F) in 33 years, most in 1979 with 76.
Rosso: days with a maximum temperature at or above 30 C (86 F) in 32 years, most in 1945 with 359.
13 fixed thresholds have at least one qualifying day at Rosso.

Days at or above 30 C (86 F)

32 years with a qualifying day

Days per year at Rosso with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 359 in 1945.

Days at or above 30 C (86 F) per year at Rosso
Year	Days	Decade average
1945	359	340.3
1947	328	340.3
1949	334	340.3
1950	306	324.2
1951	322	324.2
1952	326	324.2
1953	341	324.2
1954	331	324.2
1955	341	324.2
1956	320	324.2
1957	311	324.2
1958	323	324.2
1959	321	324.2
1960	337	335.4
1961	349	335.4
1963	340	335.4
1964	337	335.4
1965	314	335.4
1967	322	335.4
1968	336	335.4
1969	348	335.4
1970	353	339.5
1971	353	339.5
1972	338	339.5
1973	342	339.5
1974	331	339.5
1975	322	339.5
1976	315	339.5
1977	353	339.5
1978	344	339.5
1979	344	339.5
1980	335	335

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

First to last qualifying date each year at Rosso
Year	First date	Last date
1945	1945-01-01	1945-12-31
1947	1947-01-06	1947-12-31
1949	1949-01-08	1949-12-31
1950	1950-01-01	1950-12-31
1951	1951-01-01	1951-12-31
1952	1952-01-03	1952-12-28
1953	1953-01-04	1953-12-31
1954	1954-01-01	1954-12-31
1955	1955-01-01	1955-12-27
1956	1956-01-06	1956-12-11
1957	1957-01-12	1957-12-28
1958	1958-01-08	1958-12-25
1959	1959-01-03	1959-12-30
1960	1960-01-02	1960-12-31
1961	1961-01-02	1961-12-31
1963	1963-01-01	1963-12-20
1964	1964-01-05	1964-12-31
1965	1965-01-01	1965-12-28
1967	1967-01-01	1967-12-30
1968	1968-01-11	1968-12-30
1969	1969-01-02	1969-12-31
1970	1970-01-01	1970-12-28
1971	1971-01-02	1971-12-31
1972	1972-01-01	1972-12-28
1973	1973-01-01	1973-12-31
1974	1974-01-01	1974-12-31
1975	1975-01-01	1975-12-30
1976	1976-01-01	1976-12-30
1977	1977-01-01	1977-12-29
1978	1978-01-01	1978-12-31
1979	1979-01-01	1979-12-31
1980	1980-01-01	1980-12-31

Every Fixed Threshold

Fixed thresholds at Rosso
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	32	359	1945	335
35 C (95 F): Days	32	264	1977	214
40 C (104 F): Days	32	75	1973	53
45 C (113 F): Days	26	7	1973	1
90 F (32.2 C): Days	32	328	1970	295
100 F (37.8 C): Days	32	150	1977	109
110 F (43.3 C): Days	32	22	1973	5
20 C (68 F): Tropical nights (min	33	227	1979	205
25 C (77 F): Days with min	33	76	1979	37
10 mm (0.39 in): Days with 10 mm or more rain	34	19	1952	8
25 mm (0.98 in): Days with 25 mm or more rain	32	9	1947	3
50 mm (1.97 in): Days with 50 mm or more rain	15	4	1947	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1947	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1945.

Download the Data

Data for Rosso 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).

Rosso Threshold Days by Year (MR000001489)

Key Facts for Rosso Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related