Walnut Creek Threshold Days by Year (USC00029158)

20 fixed thresholds counted per year at Walnut Creek (USC00029158): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Walnut Creek Thresholds

Walnut Creek: days with 10 mm (0.39 in) or more of precipitation in 107 years, most in 1965 with 26.
Walnut Creek: days with 25 mm (0.98 in) or more of precipitation in 101 years, most in 1927 with 8.
Walnut Creek: days with a maximum temperature at or above 30 C (86 F) in 74 years, most in 2020 with 142.
Walnut Creek: days with a maximum temperature at or above 35 C (95 F) in 74 years, most in 2002 with 50.
20 fixed thresholds have at least one qualifying day at Walnut Creek.

Days at or above 30 C (86 F)

74 years with a qualifying day

Days per year at Walnut Creek with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 142 in 2020.

Days at or above 30 C (86 F) per year at Walnut Creek
Year	Days	Decade average
1952	73	71.9
1953	71	71.9
1954	58	71.9
1955	58	71.9
1956	83	71.9
1957	68	71.9
1958	92	71.9
1959	72	71.9
1960	85	71.8
1961	81	71.8
1962	82	71.8
1963	78	71.8
1964	71	71.8
1965	58	71.8
1966	72	71.8
1967	67	71.8
1968	67	71.8
1969	57	71.8
1970	54	81
1971	79	81
1972	72	81
1973	88	81
1974	95	81
1975	98	81
1976	62	81
1977	74	81
1978	96	81
1979	92	81
1980	95	82.7
1981	83	82.7
1982	69	82.7
1983	83	82.7
1984	64	82.7
1985	81	82.7
1986	66	82.7
1987	87	82.7
1988	84	82.7
1989	115	82.7
1990	66	85.2
1991	82	85.2
1992	80	85.2
1993	92	85.2
1994	110	85.2
1995	92	85.2
1996	115	85.2
1997	92	85.2
1998	62	85.2
1999	61	85.2
2000	113	101.1
2001	113	101.1
2002	106	101.1
2004	94	101.1
2005	94	101.1
2006	103	101.1
2007	113	101.1
2008	97	101.1
2009	77	101.1
2010	79	85.2
2011	65	85.2
2012	74	85.2
2013	71	85.2
2014	100	85.2
2015	77	85.2
2016	83	85.2
2017	95	85.2
2018	112	85.2
2019	96	85.2
2020	142	110.9
2021	105	110.9
2022	95	110.9
2023	89	110.9
2024	129	110.9
2025	106	110.9
2026	110	110.9

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

First to last qualifying date each year at Walnut Creek
Year	First date	Last date
1952	1952-06-08	1952-10-10
1953	1953-06-11	1953-09-24
1954	1954-05-19	1954-09-23
1955	1955-05-29	1955-10-02
1956	1956-05-17	1956-09-26
1957	1957-06-02	1957-09-15
1958	1958-05-17	1958-09-21
1959	1959-05-12	1959-10-25
1960	1960-05-10	1960-09-27
1961	1961-04-04	1961-09-25
1962	1962-04-13	1962-09-22
1963	1963-05-06	1963-10-01
1964	1964-05-15	1964-10-09
1965	1965-06-18	1965-10-12
1966	1966-05-25	1966-09-22
1967	1967-05-18	1967-09-23
1968	1968-05-27	1968-09-26
1969	1969-05-09	1969-08-23
1970	1970-06-18	1970-09-23
1971	1971-06-08	1971-09-16
1972	1972-05-29	1972-10-01
1973	1973-05-11	1973-10-01
1974	1974-05-06	1974-09-10
1975	1975-05-11	1975-10-05
1976	1976-05-14	1976-09-04
1977	1977-05-30	1977-09-08
1978	1978-05-13	1978-10-07
1979	1979-05-14	1979-10-06
1980	1980-06-08	1980-10-10
1981	1981-06-05	1981-09-18
1982	1982-06-11	1982-09-25
1983	1983-05-22	1983-09-21
1984	1984-05-09	1984-09-19
1985	1985-06-05	1985-10-24
1986	1986-05-19	1986-09-08
1987	1987-06-01	1987-10-06
1988	1988-05-12	1988-10-02
1989	1989-04-06	1989-09-29
1990	1990-04-13	1990-09-14
1991	1991-05-24	1991-10-18
1992	1992-04-27	1992-09-29
1993	1993-05-11	1993-10-04
1994	1994-04-14	1994-09-30
1995	1995-05-31	1995-10-16
1996	1996-04-23	1996-10-10
1997	1997-05-05	1997-11-03
1998	1998-06-01	1998-09-19
1999	1999-06-12	1999-09-26
2000	2000-04-26	2000-10-01
2001	2001-05-07	2001-10-01
2002	2002-04-14	2002-09-26
2004	2004-03-21	2004-09-18
2005	2005-05-19	2005-09-30
2006	2006-05-02	2006-09-30
2007	2007-03-17	2007-09-16
2008	2008-05-16	2008-10-08
2009	2009-05-07	2009-09-30
2010	2010-06-04	2010-10-02
2011	2011-07-01	2011-09-29
2012	2012-04-22	2012-10-03
2013	2013-04-28	2013-09-06
2014	2014-05-03	2014-10-04
2015	2015-05-28	2015-10-14
2016	2016-06-01	2016-09-19
2017	2017-05-04	2017-10-17
2018	2018-04-10	2018-10-01
2019	2019-06-05	2019-09-14
2020	2020-04-26	2020-10-20
2021	2021-04-04	2021-09-23
2022	2022-05-05	2022-09-19
2023	2023-04-28	2023-10-28
2024	2024-05-17	2024-10-24
2025	2025-04-10	2025-10-02
2026	2026-03-18	2026-09-19

Every Fixed Threshold

Fixed thresholds at Walnut Creek
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	74	142	2020	110
35 C (95 F): Days	74	50	2002	38
40 C (104 F): Days	18	4	2021	1
45 C (113 F): Days	1	1	1969	1
90 F (32.2 C): Days	74	106	2020	83
100 F (37.8 C): Days	45	17	2020	8
110 F (43.3 C): Days	2	1	1969	1
0 C (32 F): Ice days (max	30	10	1971	1
0 C (32 F): Frost days (min	74	245	1970	80
-10 C (14 F): Days with min	74	40	1964	1
-20 C (-4 F): Days with min	11	4	1971	1
20 C (68 F): Tropical nights (min	22	16	2018	1
25 C (77 F): Days with min	1	1	2018	1
10 mm (0.39 in): Days with 10 mm or more rain	107	26	1965	11
25 mm (0.98 in): Days with 25 mm or more rain	101	8	1927	1
50 mm (1.97 in): Days with 50 mm or more rain	20	3	2004	2
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1927	1
10 cm (3.9 in): Days with 10 cm or more snowfall	46	8	1922	1
25 cm (9.8 in): Days with 25 cm or more snowfall	12	3	1919	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1931	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1952.

Download the Data

Data for Walnut Creek 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).

Walnut Creek Threshold Days by Year (USC00029158)

Key Facts for Walnut Creek Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related