Folsom Threshold Days by Year (USC00043111)

13 fixed thresholds counted per year at Folsom (USC00043111): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Folsom Thresholds

Folsom: days with a maximum temperature at or above 30 C (86 F) in 48 years, most in 1910 with 134.
Folsom: days with a maximum temperature at or above 35 C (95 F) in 48 years, most in 1936 with 85.
Folsom: days with a maximum temperature at or above 40 C (104 F) in 48 years, most in 1906 with 31.
Folsom: days with a maximum temperature at or above 90 F (32.2 C) in 48 years, most in 1908 with 110.
13 fixed thresholds have at least one qualifying day at Folsom.

Days at or above 30 C (86 F)

48 years with a qualifying day

Days per year at Folsom with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 134 in 1910.

Days at or above 30 C (86 F) per year at Folsom
Year	Days	Decade average
1905	124	121.4
1906	125	121.4
1907	98	121.4
1908	132	121.4
1909	128	121.4
1910	134	113.1
1912	99	113.1
1913	102	113.1
1915	113	113.1
1916	97	113.1
1917	126	113.1
1918	112	113.1
1919	122	113.1
1920	92	115.5
1921	124	115.5
1922	116	115.5
1923	110	115.5
1924	128	115.5
1925	95	115.5
1926	131	115.5
1927	122	115.5
1928	125	115.5
1929	112	115.5
1930	103	120.4
1931	127	120.4
1932	116	120.4
1933	117	120.4
1934	126	120.4
1935	126	120.4
1936	124	120.4
1937	119	120.4
1938	118	120.4
1939	128	120.4
1940	125	109.1
1941	92	109.1
1942	112	109.1
1943	103	109.1
1944	113	109.1
1945	114	109.1
1946	116	109.1
1947	110	109.1
1948	95	109.1
1949	111	109.1
1950	115	105.2
1951	117	105.2
1952	109	105.2
1953	90	105.2
1954	95	105.2

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

First to last qualifying date each year at Folsom
Year	First date	Last date
1905	1905-05-14	1905-10-12
1906	1906-04-19	1906-10-28
1907	1907-05-15	1907-10-04
1908	1908-04-09	1908-10-26
1909	1909-04-24	1909-10-26
1910	1910-04-16	1910-10-28
1912	1912-05-06	1912-10-16
1913	1913-04-24	1913-10-27
1915	1915-05-27	1915-10-20
1916	1916-04-30	1916-09-29
1917	1917-05-05	1917-10-22
1918	1918-05-01	1918-10-13
1919	1919-04-23	1919-10-07
1920	1920-04-27	1920-09-29
1921	1921-04-28	1921-11-03
1922	1922-05-03	1922-09-30
1923	1923-03-28	1923-10-21
1924	1924-04-07	1924-10-04
1925	1925-05-03	1925-10-27
1926	1926-04-25	1926-10-07
1927	1927-04-24	1927-10-24
1928	1928-04-30	1928-10-22
1929	1929-05-02	1929-10-25
1930	1930-05-19	1930-10-19
1931	1931-04-17	1931-11-08
1932	1932-04-09	1932-10-13
1933	1933-05-25	1933-10-24
1934	1934-04-07	1934-10-14
1935	1935-05-20	1935-10-11
1936	1936-05-09	1936-10-17
1937	1937-05-03	1937-10-27
1938	1938-05-11	1938-10-13
1939	1939-04-07	1939-10-24
1940	1940-05-08	1940-10-19
1941	1941-05-09	1941-10-17
1942	1942-05-20	1942-10-22
1943	1943-05-10	1943-10-16
1944	1944-05-03	1944-10-28
1945	1945-04-19	1945-10-15
1946	1946-04-24	1946-10-14
1947	1947-04-14	1947-10-04
1948	1948-05-15	1948-10-10
1949	1949-04-23	1949-11-04
1950	1950-04-20	1950-10-15
1951	1951-04-11	1951-10-15
1952	1952-05-17	1952-10-07
1953	1953-05-06	1953-10-10
1954	1954-04-17	1954-10-16

Every Fixed Threshold

Fixed thresholds at Folsom
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	48	134	1910	95
35 C (95 F): Days	48	85	1936	39
40 C (104 F): Days	48	31	1906	10
45 C (113 F): Days	6	7	1905	1
90 F (32.2 C): Days	48	110	1908	71
100 F (37.8 C): Days	48	51	1906	16
110 F (43.3 C): Days	28	7	1905	1
0 C (32 F): Frost days (min	48	58	1949	16
20 C (68 F): Tropical nights (min	41	34	1918	6
25 C (77 F): Days with min	6	4	1917	1
10 mm (0.39 in): Days with 10 mm or more rain	47	39	1906	27
25 mm (0.98 in): Days with 25 mm or more rain	44	16	1906	9
50 mm (1.97 in): Days with 50 mm or more rain	24	4	1940	2

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 Folsom 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).

Folsom Threshold Days by Year (USC00043111)

Key Facts for Folsom Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related