Rocklin Threshold Days by Year (USC00047516)

15 fixed thresholds counted per year at Rocklin (USC00047516): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rocklin Thresholds

Rocklin: days with a maximum temperature at or above 30 C (86 F) in 68 years, most in 1974 with 134.
Rocklin: days with a maximum temperature at or above 35 C (95 F) in 68 years, most in 1936 with 88.
Rocklin: days with a maximum temperature at or above 90 F (32.2 C) in 68 years, most in 1970 with 110.
Rocklin: days with a maximum temperature at or above 100 F (37.8 C) in 68 years, most in 1936 with 59.
15 fixed thresholds have at least one qualifying day at Rocklin.

Days at or above 30 C (86 F)

68 years with a qualifying day

Days per year at Rocklin with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 134 in 1974.

Days at or above 30 C (86 F) per year at Rocklin
Year	Days	Decade average
1905	104	101.8
1906	110	101.8
1907	89	101.8
1908	99	101.8
1909	107	101.8
1910	133	112.8
1911	104	112.8
1912	118	112.8
1913	128	112.8
1914	96	112.8
1915	111	112.8
1916	117	112.8
1917	123	112.8
1918	96	112.8
1919	102	112.8
1920	93	106.1
1921	114	106.1
1922	113	106.1
1923	90	106.1
1924	118	106.1
1925	90	106.1
1926	110	106.1
1927	121	106.1
1930	91	117.3
1931	123	117.3
1933	128	117.3
1934	117	117.3
1935	128	117.3
1936	126	117.3
1937	116	117.3
1938	108	117.3
1939	119	117.3
1940	117	109.7
1941	83	109.7
1942	107	109.7
1943	106	109.7
1944	103	109.7
1945	115	109.7
1946	115	109.7
1947	122	109.7
1948	101	109.7
1949	128	109.7
1950	118	114.2
1951	124	114.2
1952	115	114.2
1953	98	114.2
1954	108	114.2
1955	113	114.2
1956	112	114.2
1957	111	114.2
1958	127	114.2
1959	116	114.2
1960	122	114.1
1961	113	114.1
1962	112	114.1
1963	100	114.1
1964	116	114.1
1965	103	114.1
1966	120	114.1
1967	128	114.1
1968	110	114.1
1969	117	114.1
1970	123	120.2
1971	114	120.2
1972	113	120.2
1973	118	120.2
1974	134	120.2
1975	119	120.2

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

First to last qualifying date each year at Rocklin
Year	First date	Last date
1905	1905-05-14	1905-10-11
1906	1906-04-20	1906-10-27
1907	1907-05-15	1907-10-15
1908	1908-04-28	1908-10-08
1909	1909-04-26	1909-10-13
1910	1910-03-11	1910-11-07
1911	1911-05-21	1911-11-30
1912	1912-05-07	1912-11-11
1913	1913-04-25	1913-10-27
1914	1914-03-18	1914-10-28
1915	1915-05-28	1915-10-21
1916	1916-05-01	1916-09-29
1917	1917-04-26	1917-10-27
1918	1918-04-22	1918-10-20
1919	1919-05-05	1919-10-13
1920	1920-04-27	1920-09-30
1921	1921-04-28	1921-10-19
1922	1922-05-03	1922-10-02
1923	1923-03-28	1923-10-20
1924	1924-04-05	1924-10-14
1925	1925-05-02	1925-10-25
1926	1926-04-24	1926-10-06
1927	1927-04-24	1927-10-22
1930	1930-05-18	1930-10-18
1931	1931-04-16	1931-10-31
1933	1933-04-24	1933-10-27
1934	1934-04-08	1934-10-14
1935	1935-05-20	1935-10-11
1936	1936-05-09	1936-10-17
1937	1937-05-03	1937-10-26
1938	1938-05-13	1938-09-23
1939	1939-04-08	1939-10-23
1940	1940-05-11	1940-10-20
1941	1941-05-09	1941-10-17
1942	1942-05-19	1942-10-22
1943	1943-05-09	1943-10-15
1944	1944-05-02	1944-10-25
1945	1945-04-19	1945-10-14
1946	1946-04-23	1946-10-13
1947	1947-04-13	1947-10-04
1948	1948-05-15	1948-10-22
1949	1949-04-22	1949-11-05
1950	1950-04-20	1950-10-15
1951	1951-04-10	1951-10-15
1952	1952-05-17	1952-10-13
1953	1953-04-25	1953-10-10
1954	1954-04-17	1954-10-16
1955	1955-05-12	1955-10-26
1956	1956-04-23	1956-10-07
1957	1957-04-29	1957-09-28
1958	1958-05-05	1958-10-18
1959	1959-04-30	1959-10-26
1960	1960-05-11	1960-10-23
1961	1961-04-17	1961-10-19
1962	1962-04-13	1962-10-02
1963	1963-05-18	1963-10-04
1964	1964-04-15	1964-10-23
1965	1965-04-28	1965-10-27
1966	1966-04-16	1966-11-03
1967	1967-05-09	1967-10-21
1968	1968-04-28	1968-09-29
1969	1969-05-06	1969-10-02
1970	1970-05-03	1970-10-12
1971	1971-05-24	1971-10-14
1972	1972-04-28	1972-10-07
1973	1973-04-26	1973-10-18
1974	1974-05-07	1974-10-19
1975	1975-05-13	1975-10-06

Every Fixed Threshold

Fixed thresholds at Rocklin
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	68	134	1974	119
35 C (95 F): Days	68	88	1936	50
40 C (104 F): Days	67	31	1933	8
45 C (113 F): Days	10	5	1933	2
90 F (32.2 C): Days	68	110	1970	99
100 F (37.8 C): Days	68	59	1936	26
110 F (43.3 C): Days	34	10	1933	2
0 C (32 F): Ice days (max	4	1	1930	1
0 C (32 F): Frost days (min	67	72	1955	53
-10 C (14 F): Days with min	1	2	1937	2
20 C (68 F): Tropical nights (min	46	24	1921	3
25 C (77 F): Days with min	5	15	1921	1
10 mm (0.39 in): Days with 10 mm or more rain	55	39	1906	23
25 mm (0.98 in): Days with 25 mm or more rain	55	17	1906	4
50 mm (1.97 in): Days with 50 mm or more rain	25	6	1911	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1905.

Download the Data

Data for Rocklin 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).

Rocklin Threshold Days by Year (USC00047516)

Key Facts for Rocklin Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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