Hellinikon Threshold Days by Year (GR000016716)

12 fixed thresholds counted per year at Hellinikon (GR000016716): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hellinikon Thresholds

Hellinikon: days with 10 mm (0.39 in) or more of precipitation in 61 years, most in 1955 with 20.
Hellinikon: days with a maximum temperature at or above 30 C (86 F) in 55 years, most in 1994 with 109.
Hellinikon: days with a maximum temperature at or above 90 F (32.2 C) in 55 years, most in 1994 with 68.
Hellinikon: days with 25 mm (0.98 in) or more of precipitation in 55 years, most in 1988 with 7.
12 fixed thresholds have at least one qualifying day at Hellinikon.

Days at or above 30 C (86 F)

55 years with a qualifying day

Days per year at Hellinikon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 109 in 1994.

Days at or above 30 C (86 F) per year at Hellinikon
Year	Days	Decade average
1955	69	73
1956	84	73
1957	85	73
1958	63	73
1959	64	73
1960	80	71
1961	63	71
1962	85	71
1963	84	71
1964	60	71
1965	78	71
1966	73	71
1967	69	71
1968	55	71
1969	63	71
1970	70	58.4
1971	56	58.4
1972	49	58.4
1973	65	58.4
1974	62	58.4
1975	60	58.4
1976	36	58.4
1977	77	58.4
1978	52	58.4
1979	57	58.4
1980	54	61.4
1981	62	61.4
1982	60	61.4
1983	42	61.4
1984	47	61.4
1985	65	61.4
1986	72	61.4
1987	81	61.4
1988	73	61.4
1989	58	61.4
1990	71	82
1991	64	82
1992	62	82
1993	79	82
1994	109	82
1995	100	82
1996	83	82
1997	73	82
1998	86	82
1999	93	82
2000	96	83.6
2004	78	83.6
2005	77	83.6
2006	79	83.6
2007	87	83.6
2008	91	83.6
2009	77	83.6
2010	84	86.5
2011	89	86.5
2025	87	87

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

First to last qualifying date each year at Hellinikon
Year	First date	Last date
1955	1955-05-29	1955-09-12
1956	1956-06-10	1956-10-03
1957	1957-06-03	1957-09-16
1958	1958-05-26	1958-08-29
1959	1959-06-18	1959-09-01
1960	1960-05-20	1960-09-08
1961	1961-06-22	1961-09-16
1962	1962-05-31	1962-09-21
1963	1963-06-17	1963-09-20
1964	1964-06-05	1964-09-19
1965	1965-06-04	1965-10-05
1966	1966-06-16	1966-09-30
1967	1967-06-26	1967-09-28
1968	1968-05-06	1968-09-18
1969	1969-05-16	1969-09-07
1970	1970-06-11	1970-09-18
1971	1971-06-11	1971-09-06
1972	1972-05-26	1972-09-28
1973	1973-05-03	1973-09-26
1974	1974-06-05	1974-09-16
1975	1975-06-19	1975-09-17
1976	1976-06-18	1976-09-17
1977	1977-05-20	1977-09-22
1978	1978-06-08	1978-08-30
1979	1979-06-02	1979-09-29
1980	1980-06-13	1980-09-02
1981	1981-05-31	1981-10-08
1982	1982-06-14	1982-09-19
1983	1983-06-27	1983-09-16
1984	1984-06-07	1984-10-11
1985	1985-05-25	1985-09-25
1986	1986-06-14	1986-09-20
1987	1987-06-01	1987-09-22
1988	1988-06-09	1988-09-17
1989	1989-06-06	1989-09-11
1990	1990-05-26	1990-09-27
1991	1991-06-12	1991-10-02
1992	1992-06-04	1992-09-18
1993	1993-05-30	1993-09-19
1994	1994-05-23	1994-10-02
1995	1995-05-26	1995-09-22
1996	1996-05-22	1996-09-13
1997	1997-05-18	1997-09-15
1998	1998-06-03	1998-09-15
1999	1999-05-28	1999-09-27
2000	2000-06-01	2000-10-03
2004	2004-06-09	2004-09-17
2005	2005-06-15	2005-09-20
2006	2006-05-23	2006-09-09
2007	2007-05-10	2007-09-30
2008	2008-05-28	2008-09-15
2009	2009-05-18	2009-09-06
2010	2010-05-31	2010-09-21
2011	2011-06-18	2011-09-25
2025	2025-05-06	2025-08-24

Every Fixed Threshold

Fixed thresholds at Hellinikon
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	55	109	1994	87
35 C (95 F): Days	50	32	2011	36
40 C (104 F): Days	10	2	1957	1
90 F (32.2 C): Days	55	68	1994	74
100 F (37.8 C): Days	27	9	2007	8
0 C (32 F): Frost days (min	36	9	1983	1
20 C (68 F): Tropical nights (min	51	115	1999	73
25 C (77 F): Days with min	49	28	1988	34
10 mm (0.39 in): Days with 10 mm or more rain	61	20	1955	2
25 mm (0.98 in): Days with 25 mm or more rain	55	7	1988	4
50 mm (1.97 in): Days with 50 mm or more rain	25	3	1972	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1998	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

Data for Hellinikon 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).

Hellinikon Threshold Days by Year (GR000016716)

Key Facts for Hellinikon Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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