Sisters Threshold Days by Year (USC00357857)

15 fixed thresholds counted per year at Sisters (USC00357857): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sisters Thresholds

Sisters: days with a maximum temperature at or above 30 C (86 F) in 52 years, most in 2017 with 65.
Sisters: days with a maximum temperature at or above 90 F (32.2 C) in 52 years, most in 2017 with 43.
Sisters: days with a maximum temperature at or below 0 C (32 F) in 52 years, most in 1993 with 35.
Sisters: days with a maximum temperature at or above 35 C (95 F) in 48 years, most in 2017 with 21.
15 fixed thresholds have at least one qualifying day at Sisters.

Days at or above 30 C (86 F)

52 years with a qualifying day

Days per year at Sisters with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 65 in 2017.

Days at or above 30 C (86 F) per year at Sisters
Year	Days	Decade average
1959	31	31
1960	39	32.3
1961	45	32.3
1962	23	32.3
1963	26	32.3
1964	23	32.3
1965	20	32.3
1966	24	32.3
1967	60	32.3
1968	37	32.3
1969	26	32.3
1970	52	39.9
1971	39	39.9
1972	34	39.9
1973	46	39.9
1974	46	39.9
1975	31	39.9
1976	30	39.9
1977	52	39.9
1978	29	39.9
1985	51	45.3
1986	57	45.3
1989	28	45.3
1990	46	43
1991	52	43
1992	37	43
1993	25	43
1994	57	43
1995	39	43
1996	47	43
1997	31	43
1998	55	43
1999	41	43
2000	46	47.4
2001	51	47.4
2002	41	47.4
2003	60	47.4
2004	39	47.4
2005	42	47.4
2006	60	47.4
2007	41	47.4
2008	43	47.4
2009	51	47.4
2010	27	43.9
2011	50	43.9
2012	36	43.9
2013	48	43.9
2014	40	43.9
2015	47	43.9
2016	43	43.9
2017	65	43.9
2018	39	43.9

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

First to last qualifying date each year at Sisters
Year	First date	Last date
1959	1959-06-01	1959-09-12
1960	1960-06-02	1960-09-18
1961	1961-06-14	1961-10-04
1962	1962-06-23	1962-09-25
1963	1963-06-15	1963-09-28
1964	1964-06-22	1964-09-24
1965	1965-07-02	1965-08-18
1966	1966-05-25	1966-09-22
1967	1967-05-20	1967-09-28
1968	1968-06-17	1968-09-26
1969	1969-06-02	1969-08-31
1970	1970-05-25	1970-10-03
1971	1971-07-14	1971-10-05
1972	1972-05-28	1972-09-15
1973	1973-05-14	1973-09-29
1974	1974-06-10	1974-09-26
1975	1975-05-31	1975-09-14
1976	1976-06-18	1976-09-11
1977	1977-06-06	1977-09-14
1978	1978-06-05	1978-09-27
1985	1985-06-12	1985-09-27
1986	1986-04-22	1986-09-08
1989	1989-06-02	1989-09-25
1990	1990-06-22	1990-09-12
1991	1991-06-11	1991-10-12
1992	1992-05-07	1992-09-23
1993	1993-06-19	1993-09-30
1994	1994-05-25	1994-09-28
1995	1995-05-29	1995-09-18
1996	1996-06-03	1996-09-30
1997	1997-05-13	1997-09-30
1998	1998-04-30	1998-09-17
1999	1999-06-13	1999-09-23
2000	2000-06-15	2000-09-19
2001	2001-05-12	2001-10-02
2002	2002-06-14	2002-09-14
2003	2003-05-24	2003-09-29
2004	2004-06-04	2004-08-31
2005	2005-05-27	2005-09-08
2006	2006-05-16	2006-09-29
2007	2007-05-29	2007-09-12
2008	2008-05-16	2008-09-17
2009	2009-05-18	2009-09-26
2010	2010-06-28	2010-09-04
2011	2011-06-22	2011-09-25
2012	2012-05-14	2012-09-21
2013	2013-05-12	2013-09-16
2014	2014-07-02	2014-09-22
2015	2015-06-07	2015-09-14
2016	2016-06-04	2016-09-27
2017	2017-05-24	2017-09-13
2018	2018-06-25	2018-09-10

Every Fixed Threshold

Fixed thresholds at Sisters
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	52	65	2017	39
35 C (95 F): Days	48	21	2017	14
40 C (104 F): Days	5	2	1972	2
90 F (32.2 C): Days	52	43	2017	29
100 F (37.8 C): Days	22	7	1977	2
0 C (32 F): Ice days (max	52	35	1993	13
0 C (32 F): Frost days (min	45	233	1964	212
-10 C (14 F): Days with min	45	59	1985	28
-20 C (-4 F): Days with min	34	12	1972	3
-30 C (-22 F): Days with min	7	3	1972	3
10 mm (0.39 in): Days with 10 mm or more rain	42	16	1991	13
25 mm (0.98 in): Days with 25 mm or more rain	28	5	1996	3
50 mm (1.97 in): Days with 50 mm or more rain	8	2	1964	1
10 cm (3.9 in): Days with 10 cm or more snowfall	31	9	1975	3
25 cm (9.8 in): Days with 25 cm or more snowfall	9	2	1973	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1959.

Download the Data

Data for Sisters 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).

Sisters Threshold Days by Year (USC00357857)

Key Facts for Sisters Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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