Oroville Threshold Days by Year

16 fixed thresholds counted per year at Oroville (USC00046521): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Oroville Thresholds

Oroville: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 1983 with 55.
Oroville: days with 25 mm (0.98 in) or more of precipitation in 56 years, most in 2019 with 22.
Oroville: days with a maximum temperature at or above 30 C (86 F) in 46 years, most in 2020 with 146.
Oroville: days with a maximum temperature at or above 35 C (95 F) in 46 years, most in 1967 with 85.
16 fixed thresholds have at least one qualifying day at Oroville.

Days at or above 30 C (86 F)

46 years with a qualifying day

Days per year at Oroville with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 2020.

Days at or above 30 C (86 F) per year at Oroville
Year	Days	Decade average
1954	110	117.2
1955	120	117.2
1956	122	117.2
1957	95	117.2
1958	133	117.2
1959	123	117.2
1960	129	119.9
1961	117	119.9
1962	115	119.9
1963	104	119.9
1965	119	119.9
1966	129	119.9
1967	132	119.9
1968	114	119.9
1969	120	119.9
1970	127	123.2
1971	116	123.2
1972	116	123.2
1973	119	123.2
1974	138	123.2
1983	104	114
1987	124	114
1991	129	115.3
1992	130	115.3
1993	111	115.3
1994	118	115.3
1995	108	115.3
1997	123	115.3
1998	88	115.3
2002	115	114.3
2004	110	114.3
2006	118	114.3
2010	106	118.8
2011	105	118.8
2012	116	118.8
2013	121	118.8
2014	133	118.8
2015	127	118.8
2016	122	118.8
2017	116	118.8
2018	124	118.8
2019	118	118.8
2020	146	114.5
2021	142	114.5
2022	133	114.5
2026	37	114.5

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

First to last qualifying date each year at Oroville
Year	First date	Last date
1954	1954-04-16	1954-10-16
1955	1955-03-28	1955-11-10
1956	1956-04-20	1956-10-07
1957	1957-04-28	1957-09-25
1958	1958-05-05	1958-10-17
1959	1959-04-24	1959-10-26
1960	1960-04-05	1960-10-24
1961	1961-04-04	1961-10-19
1962	1962-04-07	1962-10-02
1963	1963-05-17	1963-10-04
1965	1965-04-27	1965-10-31
1966	1966-04-01	1966-11-03
1967	1967-05-09	1967-11-03
1968	1968-04-28	1968-10-28
1969	1969-05-06	1969-10-22
1970	1970-05-02	1970-10-12
1971	1971-05-11	1971-10-14
1972	1972-04-28	1972-10-08
1973	1973-04-26	1973-10-17
1974	1974-05-05	1974-10-19
1983	1983-05-18	1983-10-03
1987	1987-04-10	1987-10-10
1991	1991-05-21	1991-10-21
1992	1992-04-25	1992-10-13
1993	1993-04-28	1993-10-26
1994	1994-04-15	1994-10-03
1995	1995-05-19	1995-10-20
1997	1997-04-25	1997-09-30
1998	1998-04-27	1998-10-20
2002	2002-03-31	2002-10-10
2004	2004-04-10	2004-10-14
2006	2006-04-27	2006-10-21
2010	2010-05-04	2010-10-16
2011	2011-05-05	2011-09-30
2012	2012-04-21	2012-10-19
2013	2013-04-21	2013-09-19
2014	2014-04-29	2014-10-13
2015	2015-04-19	2015-10-21
2016	2016-04-06	2016-10-09
2017	2017-04-30	2017-10-26
2018	2018-04-23	2018-11-03
2019	2019-04-22	2019-10-30
2020	2020-04-24	2020-10-21
2021	2021-04-18	2021-10-05
2022	2022-03-22	2022-10-19
2026	2026-03-17	2026-06-28

Every Fixed Threshold

Fixed thresholds at Oroville
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	46	146	2020	37
35 C (95 F): Days	46	85	1967	8
40 C (104 F): Days	45	27	1961	19
45 C (113 F): Days	4	3	1972	1
90 F (32.2 C): Days	46	117	2020	24
100 F (37.8 C): Days	46	52	1967	3
110 F (43.3 C): Days	14	9	1961	4
0 C (32 F): Frost days (min	44	56	2011	4
-10 C (14 F): Days with min	1	0	n/a	2
20 C (68 F): Tropical nights (min	44	39	1967	5
25 C (77 F): Days with min	9	8	1961	1
10 mm (0.39 in): Days with 10 mm or more rain	56	55	1983	9
25 mm (0.98 in): Days with 25 mm or more rain	56	22	2019	4
50 mm (1.97 in): Days with 50 mm or more rain	36	6	2019	2
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1962	1
10 cm (3.9 in): Days with 10 cm or more snowfall	1	1	1983	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

Download the Data

Data for Oroville 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 2026-10-13 (13 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Oroville Threshold Days by Year

Key Facts for Oroville Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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