Willow Creek Threshold Days by Year (CA004039000)

16 fixed thresholds counted per year at Willow Creek (CA004039000): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Willow Creek Thresholds

Willow Creek: nights with a minimum temperature at or below 0 C (32 F) in 46 years, most in 1917 with 226.
Willow Creek: nights with a minimum temperature at or below -10 C (14 F) in 46 years, most in 1970 with 136.
Willow Creek: nights with a minimum temperature at or below -20 C (-4 F) in 46 years, most in 1951 with 76.
Willow Creek: nights with a minimum temperature at or below -30 C (-22 F) in 46 years, most in 1916 with 36.
16 fixed thresholds have at least one qualifying day at Willow Creek.

Days at or above 30 C (86 F)

43 years with a qualifying day

Days per year at Willow Creek with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1936.

Days at or above 30 C (86 F) per year at Willow Creek
Year	Days	Decade average
1916	30	41.5
1917	53	41.5
1923	25	24.8
1924	27	24.8
1926	37	24.8
1927	12	24.8
1928	23	24.8
1930	56	36.5
1931	33	36.5
1932	38	36.5
1933	42	36.5
1934	35	36.5
1935	32	36.5
1936	59	36.5
1937	38	36.5
1938	10	36.5
1939	22	36.5
1940	16	27.8
1941	39	27.8
1942	21	27.8
1943	30	27.8
1944	12	27.8
1945	28	27.8
1946	25	27.8
1947	28	27.8
1949	51	27.8
1950	23	30.1
1951	26	30.1
1953	35	30.1
1955	20	30.1
1956	26	30.1
1957	33	30.1
1958	42	30.1
1959	36	30.1
1960	34	37.5
1963	50	37.5
1966	37	37.5
1967	51	37.5
1968	17	37.5
1969	36	37.5
1970	35	32
1972	30	32
1973	31	32

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

First to last qualifying date each year at Willow Creek
Year	First date	Last date
1916	1916-06-16	1916-09-18
1917	1917-05-13	1917-09-23
1923	1923-05-25	1923-09-14
1924	1924-05-15	1924-10-25
1926	1926-06-04	1926-08-29
1927	1927-07-07	1927-09-06
1928	1928-05-06	1928-08-18
1930	1930-06-07	1930-09-06
1931	1931-05-13	1931-09-05
1932	1932-06-22	1932-09-05
1933	1933-05-30	1933-08-20
1934	1934-05-15	1934-08-26
1935	1935-06-22	1935-09-14
1936	1936-05-14	1936-09-21
1937	1937-06-02	1937-09-20
1938	1938-07-17	1938-09-21
1939	1939-05-14	1939-08-28
1940	1940-07-09	1940-09-02
1941	1941-05-12	1941-08-23
1942	1942-07-02	1942-09-08
1943	1943-07-03	1943-10-04
1944	1944-06-30	1944-09-07
1945	1945-06-21	1945-09-03
1946	1946-07-05	1946-09-14
1947	1947-07-02	1947-09-12
1949	1949-05-10	1949-09-09
1950	1950-06-20	1950-09-06
1951	1951-05-23	1951-08-22
1953	1953-06-12	1953-08-21
1955	1955-07-14	1955-09-02
1956	1956-06-02	1956-08-24
1957	1957-06-04	1957-09-07
1958	1958-05-11	1958-10-03
1959	1959-06-02	1959-09-13
1960	1960-05-12	1960-09-19
1963	1963-05-30	1963-09-30
1966	1966-05-26	1966-09-18
1967	1967-06-26	1967-09-29
1968	1968-06-19	1968-09-11
1969	1969-06-04	1969-09-18
1970	1970-06-03	1970-08-28
1972	1972-05-31	1972-08-29
1973	1973-05-16	1973-08-21

Every Fixed Threshold

Fixed thresholds at Willow Creek
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	43	59	1936	31
35 C (95 F): Days	36	31	1936	8
40 C (104 F): Days	9	3	1936	1
90 F (32.2 C): Days	43	45	1936	18
100 F (37.8 C): Days	21	16	1936	2
0 C (32 F): Ice days (max	43	127	1955	69
0 C (32 F): Frost days (min	46	226	1917	210
-10 C (14 F): Days with min	46	136	1970	92
-20 C (-4 F): Days with min	46	76	1951	40
-30 C (-22 F): Days with min	46	36	1916	7
-40 C (-40 F): Days with min	28	13	1950	3
20 C (68 F): Tropical nights (min	11	4	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	19	13	1938	8
25 mm (0.98 in): Days with 25 mm or more rain	10	4	1968	1
50 mm (1.97 in): Days with 50 mm or more rain	3	2	1968	1
10 cm (3.9 in): Days with 10 cm or more snowfall	17	7	1967	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1916.

Download the Data

Data for Willow 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).

Willow Creek Threshold Days by Year (CA004039000)

Key Facts for Willow Creek Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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