Ai-Petri Threshold Days by Year (UPM00033999)

11 fixed thresholds counted per year at Ai-Petri (UPM00033999): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ai-Petri Thresholds

Ai-Petri: nights with a minimum temperature at or below 0 C (32 F) in 108 years, most in 1945 with 167.
Ai-Petri: nights with a minimum temperature at or below -10 C (14 F) in 108 years, most in 1929 with 58.
Ai-Petri: days with a maximum temperature at or below 0 C (32 F) in 107 years, most in 1907 with 97.
Ai-Petri: days with 10 mm (0.39 in) or more of precipitation in 105 years, most in 1997 with 47.
11 fixed thresholds have at least one qualifying day at Ai-Petri.

Nights at or below 0 C (32 F)

108 years with a qualifying day

Days per year at Ai-Petri with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 167 in 1945.

Nights at or below 0 C (32 F) per year at Ai-Petri
Year	Days	Decade average
1898	114	114
1900	129	141
1901	124	141
1902	155	141
1903	128	141
1904	158	141
1905	138	141
1906	137	141
1907	149	141
1908	151	141
1909	141	141
1910	133	134.1
1911	146	134.1
1912	155	134.1
1913	141	134.1
1914	146	134.1
1915	135	134.1
1916	124	134.1
1917	126	134.1
1918	131	134.1
1919	104	134.1
1920	156	138
1921	143	138
1923	118	138
1925	119	138
1926	146	138
1927	141	138
1928	144	138
1929	137	138
1930	127	135.5
1931	155	135.5
1932	138	135.5
1933	149	135.5
1934	114	135.5
1935	131	135.5
1936	135	135.5
1937	117	135.5
1938	147	135.5
1939	142	135.5
1940	142	144.2
1945	167	144.2
1946	138	144.2
1947	125	144.2
1948	154	144.2
1949	139	144.2
1950	128	138.4
1951	128	138.4
1952	128	138.4
1953	155	138.4
1954	135	138.4
1955	138	138.4
1956	156	138.4
1957	132	138.4
1958	133	138.4
1959	151	138.4
1960	109	128.5
1961	121	128.5
1962	123	128.5
1963	147	128.5
1964	139	128.5
1965	142	128.5
1966	102	128.5
1967	134	128.5
1968	129	128.5
1969	139	128.5
1970	148	135.9
1971	134	135.9
1972	141	135.9
1973	142	135.9
1974	150	135.9
1975	136	135.9
1976	113	135.9
1977	138	135.9
1978	132	135.9
1979	125	135.9
1980	136	139.3
1981	139	139.3
1982	135	139.3
1983	134	139.3
1984	142	139.3
1985	143	139.3
1986	142	139.3
1987	144	139.3
1988	154	139.3
1989	124	139.3
1990	134	143
1991	138	143
1992	166	143
1993	156	143
1994	144	143
1995	143	143
1996	126	143
1997	155	143
1998	134	143
1999	134	143
2000	124	131.6
2001	128	131.6
2002	120	131.6
2003	152	131.6
2004	129	131.6
2005	137	131.6
2006	137	131.6
2007	151	131.6
2008	118	131.6
2009	120	131.6
2010	97	128
2011	158	128
2012	129	128

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

First to last qualifying date each year at Ai-Petri
Year	First date	Last date
1898	1898-01-01	1898-12-31
1900	1900-01-01	1900-12-31
1901	1901-01-01	1901-12-31
1902	1902-01-01	1902-12-30
1903	1903-01-03	1903-12-31
1904	1904-01-01	1904-12-31
1905	1905-01-01	1905-12-29
1906	1906-01-01	1906-12-31
1907	1907-01-01	1907-12-31
1908	1908-01-01	1908-12-31
1909	1909-01-01	1909-12-31
1910	1910-01-01	1910-12-31
1911	1911-01-01	1911-12-31
1912	1912-01-01	1912-12-31
1913	1913-01-01	1913-12-29
1914	1914-01-03	1914-12-31
1915	1915-01-01	1915-12-31
1916	1916-01-01	1916-12-31
1917	1917-01-01	1917-12-31
1918	1918-01-01	1918-12-30
1919	1919-01-05	1919-12-31
1920	1920-01-01	1920-12-31
1921	1921-01-01	1921-12-16
1923	1923-01-01	1923-12-31
1925	1925-01-01	1925-12-31
1926	1926-01-01	1926-12-31
1927	1927-01-01	1927-12-31
1928	1928-01-01	1928-12-31
1929	1929-01-06	1929-12-30
1930	1930-01-01	1930-12-31
1931	1931-01-01	1931-12-28
1932	1932-01-02	1932-12-31
1933	1933-01-01	1933-12-31
1934	1934-01-05	1934-12-31
1935	1935-01-04	1935-12-31
1936	1936-01-02	1936-12-31
1937	1937-01-01	1937-12-31
1938	1938-01-01	1938-12-31
1939	1939-01-01	1939-12-31
1940	1940-01-01	1940-12-31
1945	1945-01-01	1945-12-31
1946	1946-01-01	1946-12-31
1947	1947-01-01	1947-12-29
1948	1948-01-02	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	1952-12-28
1953	1953-01-05	1953-12-31
1954	1954-01-01	1954-12-31
1955	1955-01-01	1955-12-31
1956	1956-01-04	1956-12-31
1957	1957-01-01	1957-12-30
1958	1958-01-03	1958-12-31
1959	1959-01-01	1959-12-30
1960	1960-01-01	1960-12-31
1961	1961-01-01	1961-12-28
1962	1962-01-03	1962-12-30
1963	1963-01-01	1963-12-31
1964	1964-01-01	1964-12-31
1965	1965-01-01	1965-12-31
1966	1966-01-02	1966-12-31
1967	1967-01-01	1967-12-31
1968	1968-01-04	1968-12-28
1969	1969-01-04	1969-12-31
1970	1970-01-01	1970-12-29
1971	1971-01-04	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
1977	1977-01-01	1977-12-29
1978	1978-01-01	1978-12-31
1979	1979-01-02	1979-12-31
1980	1980-01-01	1980-12-31
1981	1981-01-01	1981-12-30
1982	1982-01-03	1982-12-31
1983	1983-01-01	1983-12-31
1984	1984-01-01	1984-12-31
1985	1985-01-01	1985-12-30
1986	1986-01-06	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
1993	1993-01-01	1993-12-31
1994	1994-01-01	1994-12-31
1995	1995-01-01	1995-12-31
1996	1996-01-01	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	2000-01-01	2000-12-31
2001	2001-01-01	2001-12-31
2002	2002-01-01	2002-12-31
2003	2003-01-01	2003-12-30
2004	2004-01-01	2004-12-31
2005	2005-01-01	2005-12-31
2006	2006-01-01	2006-12-31
2007	2007-01-01	2007-12-31
2008	2008-01-01	2008-12-31
2009	2009-01-01	2009-12-31
2010	2010-01-03	2010-12-31
2011	2011-01-01	2011-12-31
2012	2012-01-01	2012-12-31

Every Fixed Threshold

Fixed thresholds at Ai-Petri
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	1	2	1998	2
0 C (32 F): Ice days (max	107	97	1907	70
0 C (32 F): Frost days (min	108	167	1945	129
-10 C (14 F): Days with min	108	58	1929	30
-20 C (-4 F): Days with min	34	9	1950	2
20 C (68 F): Tropical nights (min	20	5	2007	5
10 mm (0.39 in): Days with 10 mm or more rain	105	47	1997	29
25 mm (0.98 in): Days with 25 mm or more rain	104	22	1968	3
50 mm (1.97 in): Days with 50 mm or more rain	87	9	1939	1
100 mm (3.94 in): Days with 100 mm or more rain	18	3	1912	2
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1962	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1998.

Download the Data

Data for Ai-Petri 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).

Ai-Petri Threshold Days by Year (UPM00033999)

Key Facts for Ai-Petri Thresholds

Nights at or below 0 C (32 F)

Every Fixed Threshold

Download the Data

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