Portland Sewage Plt Threshold Days by Year

18 fixed thresholds counted per year at Portland Sewage Plt (USC00407359): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Portland Sewage Plt Thresholds

Portland Sewage Plt: days with 10 mm (0.39 in) or more of precipitation in 65 years, most in 1972 with 59.
Portland Sewage Plt: days with 25 mm (0.98 in) or more of precipitation in 65 years, most in 1979 with 26.
Portland Sewage Plt: days with a maximum temperature at or above 30 C (86 F) in 64 years, most in 2018 with 107.
Portland Sewage Plt: days with a maximum temperature at or above 90 F (32.2 C) in 64 years, most in 2018 with 67.
18 fixed thresholds have at least one qualifying day at Portland Sewage Plt.

Days at or above 30 C (86 F)

64 years with a qualifying day

Days per year at Portland Sewage Plt with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 107 in 2018.

Days at or above 30 C (86 F) per year at Portland Sewage Plt
Year	Days	Decade average
1956	90	82.3
1957	71	82.3
1958	79	82.3
1959	89	82.3
1960	75	68.5
1963	68	68.5
1964	85	68.5
1965	75	68.5
1966	61	68.5
1967	38	68.5
1968	68	68.5
1969	78	68.5
1970	78	64.2
1971	62	64.2
1972	56	64.2
1973	76	64.2
1974	51	64.2
1975	73	64.2
1976	35	64.2
1977	86	64.2
1978	81	64.2
1979	44	64.2
1980	85	76.5
1981	56	76.5
1982	62	76.5
1985	82	76.5
1986	89	76.5
1987	96	76.5
1988	78	76.5
1989	64	76.5
1990	74	69.2
1991	80	69.2
1992	42	69.2
1993	81	69.2
1994	56	69.2
1995	71	69.2
1996	62	69.2
1997	54	69.2
1998	92	69.2
1999	80	69.2
2000	69	64.1
2001	60	64.1
2002	84	64.1
2003	42	64.1
2004	35	64.1
2005	77	64.1
2006	68	64.1
2007	98	64.1
2008	61	64.1
2009	47	64.1
2010	101	84.7
2011	82	84.7
2012	76	84.7
2013	49	84.7
2014	74	84.7
2018	107	84.7
2019	104	84.7
2020	78	76.7
2021	64	76.7
2022	82	76.7
2023	66	76.7
2024	84	76.7
2025	83	76.7
2026	80	76.7

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

First to last qualifying date each year at Portland Sewage Plt
Year	First date	Last date
1956	1956-05-05	1956-10-01
1957	1957-05-12	1957-09-11
1958	1958-05-16	1958-09-26
1959	1959-05-01	1959-10-10
1960	1960-04-23	1960-10-02
1963	1963-04-22	1963-10-23
1964	1964-04-21	1964-09-21
1965	1965-04-23	1965-10-17
1966	1966-05-08	1966-09-10
1967	1967-05-20	1967-09-20
1968	1968-05-02	1968-09-23
1969	1969-05-22	1969-09-17
1970	1970-04-30	1970-09-23
1971	1971-04-20	1971-10-03
1972	1972-05-26	1972-09-22
1973	1973-06-04	1973-10-05
1974	1974-04-04	1974-09-13
1975	1975-05-22	1975-09-10
1976	1976-06-10	1976-08-28
1977	1977-04-16	1977-09-26
1978	1978-05-22	1978-09-22
1979	1979-05-11	1979-09-06
1980	1980-05-29	1980-10-10
1981	1981-06-06	1981-09-14
1982	1982-05-13	1982-09-16
1985	1985-04-21	1985-09-23
1986	1986-04-26	1986-10-03
1987	1987-04-21	1987-09-15
1988	1988-04-05	1988-09-23
1989	1989-04-25	1989-09-14
1990	1990-06-02	1990-09-30
1991	1991-05-18	1991-09-19
1992	1992-06-16	1992-09-10
1993	1993-05-09	1993-09-24
1994	1994-05-24	1994-09-16
1995	1995-04-11	1995-09-15
1996	1996-05-10	1996-10-06
1997	1997-05-19	1997-09-20
1998	1998-05-14	1998-10-01
1999	1999-06-03	1999-10-02
2000	2000-05-19	2000-10-06
2001	2001-04-11	2001-09-24
2002	2002-04-19	2002-09-21
2003	2003-06-16	2003-09-02
2004	2004-05-09	2004-09-12
2005	2005-05-12	2005-10-20
2006	2006-04-15	2006-10-05
2007	2007-05-01	2007-10-09
2008	2008-06-01	2008-09-14
2009	2009-04-25	2009-09-11
2010	2010-04-06	2010-10-12
2011	2011-04-10	2011-09-14
2012	2012-04-03	2012-09-08
2013	2013-04-18	2013-09-13
2014	2014-05-05	2014-09-11
2018	2018-05-04	2018-10-09
2019	2019-05-09	2019-10-06
2020	2020-05-17	2020-09-14
2021	2021-05-23	2021-09-16
2022	2022-05-21	2022-09-22
2023	2023-05-15	2023-10-04
2024	2024-04-16	2024-10-07
2025	2025-04-15	2025-10-04
2026	2026-03-23	2026-10-02

Every Fixed Threshold

Fixed thresholds at Portland Sewage Plt
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	64	107	2018	80
35 C (95 F): Days	48	23	2007	13
40 C (104 F): Days	2	2	2012	2
90 F (32.2 C): Days	64	67	2018	53
100 F (37.8 C): Days	13	8	2012	1
0 C (32 F): Ice days (max	64	32	1978	16
0 C (32 F): Frost days (min	63	118	1963	41
-10 C (14 F): Days with min	60	37	1963	11
-20 C (-4 F): Days with min	14	5	1977	2
20 C (68 F): Tropical nights (min	63	92	1998	63
25 C (77 F): Days with min	15	7	2010	1
10 mm (0.39 in): Days with 10 mm or more rain	65	59	1972	23
25 mm (0.98 in): Days with 25 mm or more rain	65	26	1979	11
50 mm (1.97 in): Days with 50 mm or more rain	63	9	1979	8
100 mm (3.94 in): Days with 100 mm or more rain	13	2	2025	2
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1969	1
10 cm (3.9 in): Days with 10 cm or more snowfall	15	3	1969	1
25 cm (9.8 in): Days with 25 cm or more snowfall	3	1	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1956.

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Data for Portland Sewage Plt 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Portland Sewage Plt Threshold Days by Year

Key Facts for Portland Sewage Plt Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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