Porto Threshold Days by Year (BR027748570)
5 fixed thresholds counted per year at Porto (BR027748570): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Porto Thresholds
- Porto: days with 10 mm (0.39 in) or more of precipitation in 55 years, most in 1974 with 76.
- Porto: days with 25 mm (0.98 in) or more of precipitation in 55 years, most in 1959 with 52.
- Porto: days with 50 mm (1.97 in) or more of precipitation in 48 years, most in 1962 with 19.
- Porto: days with 100 mm (3.94 in) or more of precipitation in 8 years, most in 1977 with 5.
- 5 fixed thresholds have at least one qualifying day at Porto.
Days with 10 mm (0.39 in) or more of precipitation
55 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1925 | 53 | 50.4 |
| 1926 | 35 | 50.4 |
| 1927 | 54 | 50.4 |
| 1928 | 44 | 50.4 |
| 1929 | 66 | 50.4 |
| 1930 | 36 | 45.1 |
| 1931 | 47 | 45.1 |
| 1932 | 19 | 45.1 |
| 1933 | 47 | 45.1 |
| 1934 | 53 | 45.1 |
| 1937 | 52 | 45.1 |
| 1938 | 46 | 45.1 |
| 1939 | 61 | 45.1 |
| 1940 | 38 | 42.4 |
| 1941 | 33 | 42.4 |
| 1942 | 27 | 42.4 |
| 1943 | 34 | 42.4 |
| 1944 | 40 | 42.4 |
| 1945 | 50 | 42.4 |
| 1946 | 57 | 42.4 |
| 1947 | 36 | 42.4 |
| 1948 | 56 | 42.4 |
| 1949 | 53 | 42.4 |
| 1950 | 67 | 54.4 |
| 1951 | 27 | 54.4 |
| 1952 | 66 | 54.4 |
| 1953 | 35 | 54.4 |
| 1954 | 45 | 54.4 |
| 1955 | 58 | 54.4 |
| 1956 | 51 | 54.4 |
| 1957 | 73 | 54.4 |
| 1958 | 48 | 54.4 |
| 1959 | 74 | 54.4 |
| 1960 | 45 | 52.9 |
| 1961 | 48 | 52.9 |
| 1962 | 45 | 52.9 |
| 1963 | 54 | 52.9 |
| 1964 | 68 | 52.9 |
| 1965 | 50 | 52.9 |
| 1966 | 52 | 52.9 |
| 1967 | 60 | 52.9 |
| 1968 | 60 | 52.9 |
| 1969 | 47 | 52.9 |
| 1970 | 50 | 54.3 |
| 1971 | 56 | 54.3 |
| 1972 | 44 | 54.3 |
| 1974 | 76 | 54.3 |
| 1976 | 52 | 54.3 |
| 1977 | 69 | 54.3 |
| 1978 | 42 | 54.3 |
| 1979 | 45 | 54.3 |
| 1980 | 45 | 36 |
| 1981 | 28 | 36 |
| 1982 | 41 | 36 |
| 1983 | 30 | 36 |
| Year | First date | Last date |
|---|---|---|
| 1925 | 1925-01-07 | 1925-12-29 |
| 1926 | 1926-01-01 | 1926-12-15 |
| 1927 | 1927-01-17 | 1927-12-13 |
| 1928 | 1928-01-15 | 1928-06-28 |
| 1929 | 1929-01-18 | 1929-12-22 |
| 1930 | 1930-01-06 | 1930-12-31 |
| 1931 | 1931-01-09 | 1931-12-26 |
| 1932 | 1932-01-25 | 1932-09-16 |
| 1933 | 1933-01-13 | 1933-12-23 |
| 1934 | 1934-01-04 | 1934-12-24 |
| 1937 | 1937-01-05 | 1937-12-14 |
| 1938 | 1938-01-05 | 1938-12-27 |
| 1939 | 1939-01-01 | 1939-12-29 |
| 1940 | 1940-02-03 | 1940-06-21 |
| 1941 | 1941-01-03 | 1941-12-13 |
| 1942 | 1942-01-01 | 1942-12-26 |
| 1943 | 1943-01-23 | 1943-12-29 |
| 1944 | 1944-01-21 | 1944-12-24 |
| 1945 | 1945-01-02 | 1945-12-10 |
| 1946 | 1946-01-01 | 1946-12-30 |
| 1947 | 1947-01-26 | 1947-12-28 |
| 1948 | 1948-01-02 | 1948-12-21 |
| 1949 | 1949-01-03 | 1949-11-30 |
| 1950 | 1950-01-12 | 1950-12-24 |
| 1951 | 1951-01-08 | 1951-12-22 |
| 1952 | 1952-01-04 | 1952-12-25 |
| 1953 | 1953-01-06 | 1953-05-14 |
| 1954 | 1954-01-13 | 1954-11-23 |
| 1955 | 1955-01-01 | 1955-11-22 |
| 1956 | 1956-01-29 | 1956-12-24 |
| 1957 | 1957-01-03 | 1957-12-05 |
| 1958 | 1958-01-07 | 1958-12-23 |
| 1959 | 1959-01-15 | 1959-11-15 |
| 1960 | 1960-01-03 | 1960-12-26 |
| 1961 | 1961-01-16 | 1961-12-24 |
| 1962 | 1962-01-24 | 1962-12-21 |
| 1963 | 1963-01-14 | 1963-12-29 |
| 1964 | 1964-01-03 | 1964-12-23 |
| 1965 | 1965-01-11 | 1965-12-23 |
| 1966 | 1966-01-21 | 1966-12-24 |
| 1967 | 1967-01-03 | 1967-12-31 |
| 1968 | 1968-01-10 | 1968-12-30 |
| 1969 | 1969-01-18 | 1969-07-17 |
| 1970 | 1970-01-10 | 1970-07-11 |
| 1971 | 1971-01-10 | 1971-12-29 |
| 1972 | 1972-01-09 | 1972-12-31 |
| 1974 | 1974-01-07 | 1974-12-29 |
| 1976 | 1976-01-01 | 1976-11-09 |
| 1977 | 1977-01-02 | 1977-12-15 |
| 1978 | 1978-01-12 | 1978-12-25 |
| 1979 | 1979-01-16 | 1979-12-23 |
| 1980 | 1980-01-05 | 1980-12-29 |
| 1981 | 1981-01-06 | 1981-12-29 |
| 1982 | 1982-01-04 | 1982-12-31 |
| 1983 | 1983-01-29 | 1983-12-29 |
Every Fixed Threshold
| 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 | 55 | 76 | 1974 | 30 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 55 | 52 | 1959 | 12 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 48 | 19 | 1962 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 8 | 5 | 1977 | 5 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 1 | 1 | 1977 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.
Download the Data
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 . Last revised (2025-12-31).