Fullerton Threshold Days by Year (USC00253075)

18 fixed thresholds counted per year at Fullerton (USC00253075): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Fullerton Thresholds

Fullerton: days with 10 mm (0.39 in) or more of precipitation in 85 years, most in 1909 with 35.
Fullerton: days with 25 mm (0.98 in) or more of precipitation in 85 years, most in 1905 with 14.
Fullerton: days with 50 mm (1.97 in) or more of precipitation in 64 years, most in 1913 with 4.
Fullerton: days with 10 cm (3.9 in) or more of snowfall in 61 years, most in 1983 with 7.
18 fixed thresholds have at least one qualifying day at Fullerton.

Days at or above 30 C (86 F)

17 years with a qualifying day

Days per year at Fullerton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 87 in 1913.

Days at or above 30 C (86 F) per year at Fullerton
Year	Days	Decade average
1908	63	66
1909	69	66
1910	69	68.8
1911	72	68.8
1912	70	68.8
1913	87	68.8
1914	69	68.8
1915	33	68.8
1916	76	68.8
1919	74	68.8
1920	59	65.6
1921	87	65.6
1922	80	65.6
1923	53	65.6
1924	38	65.6
1925	70	65.6
1926	72	65.6

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

First to last qualifying date each year at Fullerton
Year	First date	Last date
1908	1908-04-13	1908-09-24
1909	1909-05-04	1909-11-06
1910	1910-03-19	1910-10-16
1911	1911-05-09	1911-09-28
1912	1912-05-02	1912-10-27
1913	1913-04-30	1913-10-03
1914	1914-04-20	1914-09-30
1915	1915-04-17	1915-11-07
1916	1916-04-11	1916-10-07
1919	1919-05-28	1919-10-02
1920	1920-05-22	1920-10-13
1921	1921-04-02	1921-10-16
1922	1922-05-05	1922-10-27
1923	1923-06-02	1923-09-05
1924	1924-04-14	1924-10-01
1925	1925-05-20	1925-09-29
1926	1926-04-29	1926-09-17

Every Fixed Threshold

Fixed thresholds at Fullerton
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	17	87	1913	72
35 C (95 F): Days	17	40	1913	27
40 C (104 F): Days	8	3	1911	3
90 F (32.2 C): Days	17	65	1913	52
100 F (37.8 C): Days	13	17	1913	8
0 C (32 F): Ice days (max	17	55	1916	27
0 C (32 F): Frost days (min	17	171	1909	160
-10 C (14 F): Days with min	17	63	1912	35
-20 C (-4 F): Days with min	17	33	1916	6
-30 C (-22 F): Days with min	7	3	1912	1
20 C (68 F): Tropical nights (min	17	28	1919	16
25 C (77 F): Days with min	3	1	1908	1
10 mm (0.39 in): Days with 10 mm or more rain	85	35	1909	8
25 mm (0.98 in): Days with 25 mm or more rain	85	14	1905	3
50 mm (1.97 in): Days with 50 mm or more rain	64	4	1913	2
100 mm (3.94 in): Days with 100 mm or more rain	9	2	1911	1
10 cm (3.9 in): Days with 10 cm or more snowfall	61	7	1983	6
25 cm (9.8 in): Days with 25 cm or more snowfall	6	1	1920	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1908.

Download the Data

Data for Fullerton 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).

Fullerton Threshold Days by Year (USC00253075)

Key Facts for Fullerton Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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