Ra-Iz Threshold Days by Year (RSM00023331)

10 fixed thresholds counted per year at Ra-Iz (RSM00023331): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ra-Iz Thresholds

Ra-Iz: days with a maximum temperature at or below 0 C (32 F) in 54 years, most in 1972 with 273.
Ra-Iz: nights with a minimum temperature at or below 0 C (32 F) in 54 years, most in 1968 with 313.
Ra-Iz: nights with a minimum temperature at or below -10 C (14 F) in 54 years, most in 1942 with 216.
Ra-Iz: nights with a minimum temperature at or below -20 C (-4 F) in 54 years, most in 1957 with 118.
10 fixed thresholds have at least one qualifying day at Ra-Iz.

Nights at or below 0 C (32 F)

54 years with a qualifying day

Days per year at Ra-Iz with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 313 in 1968.

Nights at or below 0 C (32 F) per year at Ra-Iz
Year	Days	Decade average
1939	301	301
1940	276	287.6
1941	295	287.6
1942	276	287.6
1943	273	287.6
1944	284	287.6
1945	274	287.6
1946	304	287.6
1947	300	287.6
1948	282	287.6
1949	312	287.6
1950	284	286.2
1951	292	286.2
1952	285	286.2
1953	288	286.2
1954	278	286.2
1955	278	286.2
1956	295	286.2
1957	276	286.2
1958	307	286.2
1959	279	286.2
1960	289	292.7
1961	287	292.7
1962	268	292.7
1963	289	292.7
1964	291	292.7
1965	298	292.7
1966	305	292.7
1967	289	292.7
1968	313	292.7
1969	298	292.7
1970	298	292.2
1971	293	292.2
1972	301	292.2
1973	291	292.2
1974	283	292.2
1975	283	292.2
1976	287	292.2
1978	305	292.2
1979	289	292.2
1980	304	279.5
1981	239	279.5
1982	296	279.5
1983	256	279.5
1984	281	279.5
1985	281	279.5
1986	296	279.5
1987	286	279.5
1988	291	279.5
1989	265	279.5
1990	284	278
1991	259	278
1992	302	278
1997	267	278

For each year, a bar from the first to the last day at Ra-Iz meeting 0 C (32 F).

First to last qualifying date each year at Ra-Iz
Year	First date	Last date
1939	1939-01-01	1939-12-31
1940	1940-01-01	1940-12-31
1941	1941-01-01	1941-12-31
1942	1942-01-01	1942-12-31
1943	1943-01-01	1943-12-31
1944	1944-01-01	1944-12-31
1945	1945-01-01	1945-12-31
1946	1946-01-01	1946-12-31
1947	1947-01-01	1947-12-31
1948	1948-01-01	1948-12-31
1949	1949-01-01	1949-12-31
1950	1950-01-01	1950-12-31
1951	1951-01-01	1951-12-31
1952	1952-01-01	1952-12-31
1953	1953-01-01	1953-12-31
1954	1954-01-01	1954-12-31
1955	1955-01-01	1955-12-31
1956	1956-01-01	1956-12-31
1957	1957-01-01	1957-12-31
1958	1958-01-01	1958-12-31
1959	1959-01-01	1959-12-31
1960	1960-01-01	1960-12-31
1961	1961-01-01	1961-12-31
1962	1962-01-01	1962-12-31
1963	1963-01-01	1963-12-31
1964	1964-01-01	1964-12-31
1965	1965-01-01	1965-12-31
1966	1966-01-01	1966-12-31
1967	1967-01-01	1967-12-31
1968	1968-01-01	1968-12-31
1969	1969-01-01	1969-12-31
1970	1970-01-01	1970-12-31
1971	1971-01-01	1971-12-31
1972	1972-01-01	1972-12-31
1973	1973-01-01	1973-12-31
1974	1974-01-01	1974-12-31
1975	1975-01-01	1975-12-31
1976	1976-01-01	1976-12-31
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	1981-11-30
1982	1982-01-01	1982-12-31
1983	1983-01-01	1983-12-31
1984	1984-01-01	1984-12-31
1985	1985-01-01	1985-12-31
1986	1986-01-01	1986-12-31
1987	1987-01-01	1987-12-31
1988	1988-01-01	1988-12-31
1989	1989-01-01	1989-12-31
1990	1990-01-01	1990-12-31
1991	1991-01-01	1991-12-31
1992	1992-01-01	1992-12-31
1997	1997-02-01	1997-12-31

Every Fixed Threshold

Fixed thresholds at Ra-Iz
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
0 C (32 F): Ice days (max	54	273	1972	207
0 C (32 F): Frost days (min	54	313	1968	267
-10 C (14 F): Days with min	54	216	1942	155
-20 C (-4 F): Days with min	54	118	1957	69
-30 C (-22 F): Days with min	51	37	1979	8
-40 C (-40 F): Days with min	6	2	1951	2
20 C (68 F): Tropical nights (min	2	4	1990	4
10 mm (0.39 in): Days with 10 mm or more rain	53	33	1962	13
25 mm (0.98 in): Days with 25 mm or more rain	50	9	1965	2
50 mm (1.97 in): Days with 50 mm or more rain	16	3	1943	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1939.

Download the Data

Data for Ra-Iz 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).

Ra-Iz Threshold Days by Year (RSM00023331)

Key Facts for Ra-Iz Thresholds

Nights at or below 0 C (32 F)

Every Fixed Threshold

Download the Data

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