Helen Threshold Days by Year (USC00094230)

17 fixed thresholds counted per year at Helen (USC00094230): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Helen Thresholds

Helen: days with 10 mm (0.39 in) or more of precipitation in 57 years, most in 2013 with 73.
Helen: days with 25 mm (0.98 in) or more of precipitation in 57 years, most in 2013 with 46.
Helen: days with 50 mm (1.97 in) or more of precipitation in 57 years, most in 2018 with 15.
Helen: days with a maximum temperature at or above 30 C (86 F) in 56 years, most in 1998 with 104.
17 fixed thresholds have at least one qualifying day at Helen.

Days at or above 30 C (86 F)

56 years with a qualifying day

Days per year at Helen with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 104 in 1998.

Days at or above 30 C (86 F) per year at Helen
Year	Days	Decade average
1957	60	51
1958	42	51
1960	79	52.8
1961	51	52.8
1962	93	52.8
1963	65	52.8
1964	58	52.8
1965	43	52.8
1966	41	52.8
1967	18	52.8
1968	38	52.8
1969	42	52.8
1970	59	40.5
1971	33	40.5
1972	30	40.5
1973	29	40.5
1974	27	40.5
1975	51	40.5
1976	33	40.5
1977	62	40.5
1985	54	67
1986	84	67
1987	77	67
1988	71	67
1989	49	67
1990	62	58.6
1991	59	58.6
1992	30	58.6
1993	72	58.6
1994	24	58.6
1995	51	58.6
1996	62	58.6
1997	63	58.6
1998	104	58.6
2000	74	58.7
2001	56	58.7
2002	76	58.7
2003	54	58.7
2004	45	58.7
2005	50	58.7
2006	70	58.7
2007	69	58.7
2008	43	58.7
2009	50	58.7
2010	88	64
2011	99	64
2012	61	64
2013	25	64
2014	42	64
2015	53	64
2016	90	64
2017	33	64
2018	70	64
2019	79	64
2020	45	41
2021	37	41

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

First to last qualifying date each year at Helen
Year	First date	Last date
1957	1957-05-23	1957-09-23
1958	1958-05-24	1958-09-26
1960	1960-04-24	1960-10-03
1961	1961-05-30	1961-09-26
1962	1962-04-30	1962-09-14
1963	1963-04-21	1963-10-26
1964	1964-05-10	1964-09-23
1965	1965-04-23	1965-09-20
1966	1966-06-10	1966-09-06
1967	1967-04-06	1967-08-19
1968	1968-05-24	1968-08-26
1969	1969-05-29	1969-08-26
1970	1970-04-23	1970-09-19
1971	1971-04-18	1971-09-30
1972	1972-04-15	1972-09-19
1973	1973-05-10	1973-09-10
1974	1974-04-27	1974-09-11
1975	1975-04-28	1975-09-09
1976	1976-04-19	1976-08-30
1977	1977-04-11	1977-09-03
1985	1985-05-15	1985-10-16
1986	1986-04-24	1986-10-04
1987	1987-04-23	1987-09-18
1988	1988-04-05	1988-09-24
1989	1989-04-24	1989-09-12
1990	1990-05-01	1990-09-20
1991	1991-05-18	1991-09-18
1992	1992-06-20	1992-08-26
1993	1993-06-07	1993-09-23
1994	1994-04-20	1994-09-11
1995	1995-04-10	1995-09-09
1996	1996-05-04	1996-09-06
1997	1997-06-13	1997-09-21
1998	1998-05-14	1998-10-01
2000	2000-05-13	2000-09-15
2001	2001-04-10	2001-09-24
2002	2002-04-19	2002-09-17
2003	2003-04-30	2003-09-04
2004	2004-04-19	2004-09-24
2005	2005-05-13	2005-09-24
2006	2006-04-15	2006-08-31
2007	2007-05-02	2007-09-27
2008	2008-06-01	2008-09-09
2009	2009-04-25	2009-08-28
2010	2010-04-06	2010-09-25
2011	2011-04-10	2011-09-28
2012	2012-05-01	2012-09-10
2013	2013-05-16	2013-09-13
2014	2014-05-06	2014-09-06
2015	2015-05-11	2015-09-05
2016	2016-05-31	2016-09-26
2017	2017-05-11	2017-09-29
2018	2018-05-12	2018-10-07
2019	2019-05-19	2019-10-05
2020	2020-05-25	2020-09-12
2021	2021-05-24	2021-08-30

Every Fixed Threshold

Fixed thresholds at Helen
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	56	104	1998	37
35 C (95 F): Days	28	12	1986	1
90 F (32.2 C): Days	54	60	1998	4
100 F (37.8 C): Days	3	4	2012	1
0 C (32 F): Ice days (max	36	11	2010	5
0 C (32 F): Frost days (min	54	115	1968	84
-10 C (14 F): Days with min	44	16	1963	9
-20 C (-4 F): Days with min	3	1	1962	1
20 C (68 F): Tropical nights (min	52	43	2010	11
25 C (77 F): Days with min	2	2	1988	1
10 mm (0.39 in): Days with 10 mm or more rain	57	73	2013	58
25 mm (0.98 in): Days with 25 mm or more rain	57	46	2013	25
50 mm (1.97 in): Days with 50 mm or more rain	57	15	2018	7
100 mm (3.94 in): Days with 100 mm or more rain	23	3	2018	1
200 mm (7.87 in): Days with 200 mm or more rain	2	1	1967	1
10 cm (3.9 in): Days with 10 cm or more snowfall	11	3	1969	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1971	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1957.

Download the Data

Data for Helen 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).

Helen Threshold Days by Year (USC00094230)

Key Facts for Helen Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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