Petrolina Threshold Days by Year (BR037897030)

4 fixed thresholds counted per year at Petrolina (BR037897030): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Petrolina Thresholds

Petrolina: days with 10 mm (0.39 in) or more of precipitation in 65 years, most in 1947 with 25.
Petrolina: days with 25 mm (0.98 in) or more of precipitation in 64 years, most in 1924 with 13.
Petrolina: days with 50 mm (1.97 in) or more of precipitation in 47 years, most in 1964 with 5.
Petrolina: days with 100 mm (3.94 in) or more of precipitation in 6 years, most in 1964 with 3.
4 fixed thresholds have at least one qualifying day at Petrolina.

Days with 10 mm (0.39 in) or more of precipitation

65 years with a qualifying day

Days per year at Petrolina with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 25 in 1947.

Days with 10 mm (0.39 in) or more of precipitation per year at Petrolina
Year	Days	Decade average
1912	11	8.6
1913	10	8.6
1914	4	8.6
1915	7	8.6
1916	11	8.6
1917	10	8.6
1918	7	8.6
1919	9	8.6
1920	18	15.9
1921	19	15.9
1922	13	15.9
1923	15	15.9
1924	23	15.9
1925	18	15.9
1926	19	15.9
1927	14	15.9
1928	6	15.9
1929	14	15.9
1930	10	11
1931	12	11
1932	7	11
1933	9	11
1934	12	11
1935	16	11
1936	12	11
1937	12	11
1938	11	11
1939	9	11
1940	18	12.5
1941	10	12.5
1942	12	12.5
1943	7	12.5
1944	10	12.5
1945	12	12.5
1946	11	12.5
1947	25	12.5
1948	8	12.5
1949	12	12.5
1950	9	9.4
1951	4	9.4
1952	9	9.4
1953	8	9.4
1954	13	9.4
1955	10	9.4
1956	11	9.4
1957	13	9.4
1958	6	9.4
1959	11	9.4
1960	16	15.6
1961	6	15.6
1963	13	15.6
1964	23	15.6
1965	11	15.6
1966	15	15.6
1967	25	15.6
1968	12	15.6
1969	19	15.6
1970	14	15.1
1972	14	15.1
1973	19	15.1
1974	21	15.1
1975	14	15.1
1976	7	15.1
1977	21	15.1
1978	11	15.1

For each year, a bar from the first to the last day at Petrolina meeting 10 mm (0.39 in).

First to last qualifying date each year at Petrolina
Year	First date	Last date
1912	1912-01-05	1912-06-24
1913	1913-01-31	1913-11-30
1914	1914-01-14	1914-01-31
1915	1915-12-11	1915-12-20
1916	1916-02-08	1916-12-23
1917	1917-01-14	1917-12-28
1918	1918-04-27	1918-12-30
1919	1919-01-02	1919-06-25
1920	1920-01-17	1920-12-31
1921	1921-01-01	1921-12-12
1922	1922-01-14	1922-12-24
1923	1923-01-18	1923-11-18
1924	1924-01-10	1924-12-17
1925	1925-01-22	1925-12-31
1926	1926-01-05	1926-12-08
1927	1927-02-05	1927-12-11
1928	1928-01-06	1928-03-23
1929	1929-02-01	1929-12-08
1930	1930-01-02	1930-12-19
1931	1931-02-01	1931-11-05
1932	1932-01-08	1932-11-15
1933	1933-02-18	1933-12-27
1934	1934-01-01	1934-12-21
1935	1935-01-25	1935-12-12
1936	1936-01-03	1936-12-31
1937	1937-01-29	1937-12-15
1938	1938-01-19	1938-12-18
1939	1939-01-19	1939-12-15
1940	1940-01-06	1940-12-22
1941	1941-01-15	1941-12-04
1942	1942-01-05	1942-12-04
1943	1943-01-16	1943-12-16
1944	1944-01-19	1944-12-27
1945	1945-01-11	1945-12-20
1946	1946-01-24	1946-12-22
1947	1947-01-21	1947-12-26
1948	1948-02-14	1948-12-23
1949	1949-01-30	1949-11-29
1950	1950-01-16	1950-12-29
1951	1951-03-22	1951-12-18
1952	1952-01-02	1952-12-17
1953	1953-02-26	1953-12-19
1954	1954-01-26	1954-12-07
1955	1955-01-04	1955-12-31
1956	1956-02-10	1956-12-28
1957	1957-02-19	1957-12-25
1958	1958-01-16	1958-10-22
1959	1959-01-01	1959-08-07
1960	1960-01-02	1960-09-28
1961	1961-01-13	1961-12-09
1963	1963-01-06	1963-12-25
1964	1964-01-05	1964-12-05
1965	1965-01-23	1965-11-24
1966	1966-01-15	1966-12-27
1967	1967-02-10	1967-12-29
1968	1968-01-01	1968-12-28
1969	1969-01-18	1969-12-28
1970	1970-01-12	1970-12-18
1972	1972-01-16	1972-12-25
1973	1973-02-13	1973-12-24
1974	1974-01-23	1974-12-31
1975	1975-01-20	1975-10-20
1976	1976-02-03	1976-11-30
1977	1977-01-14	1977-12-28
1978	1978-01-01	1978-11-13

Every Fixed Threshold

Fixed thresholds at Petrolina
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	65	25	1947	11
25 mm (0.98 in): Days with 25 mm or more rain	64	13	1924	6
50 mm (1.97 in): Days with 50 mm or more rain	47	5	1964	3
100 mm (3.94 in): Days with 100 mm or more rain	6	3	1964	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

Download the Data

Data for Petrolina 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).

Petrolina Threshold Days by Year (BR037897030)

Key Facts for Petrolina Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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