Lake Arrowhead Threshold Days by Year

18 fixed thresholds counted per year at Lake Arrowhead (USC00044671): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lake Arrowhead Thresholds

Lake Arrowhead: days with 10 mm (0.39 in) or more of precipitation in 59 years, most in 1983 with 41.
Lake Arrowhead: days with 25 mm (0.98 in) or more of precipitation in 59 years, most in 1978 with 26.
Lake Arrowhead: days with 50 mm (1.97 in) or more of precipitation in 58 years, most in 1978 with 17.
Lake Arrowhead: nights with a minimum temperature at or below 0 C (32 F) in 57 years, most in 1975 with 142.
18 fixed thresholds have at least one qualifying day at Lake Arrowhead.

Days at or above 30 C (86 F)

55 years with a qualifying day

Days per year at Lake Arrowhead with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 56 in 2000.

Days at or above 30 C (86 F) per year at Lake Arrowhead
Year	Days	Decade average
1942	36	27.5
1943	27	27.5
1944	30	27.5
1945	38	27.5
1946	14	27.5
1947	24	27.5
1948	21	27.5
1949	30	27.5
1950	26	15.8
1951	24	15.8
1952	6	15.8
1953	23	15.8
1954	14	15.8
1955	14	15.8
1956	9	15.8
1957	11	15.8
1958	10	15.8
1959	21	15.8
1960	22	16.8
1961	22	16.8
1962	19	16.8
1963	11	16.8
1964	9	16.8
1965	4	16.8
1966	6	16.8
1967	27	16.8
1968	21	16.8
1969	27	16.8
1970	35	23
1971	18	23
1972	23	23
1973	35	23
1974	14	23
1975	16	23
1976	17	23
1977	20	23
1978	17	23
1979	35	23
1981	24	16
1982	17	16
1983	15	16
1984	13	16
1986	16	16
1987	9	16
1988	16	16
1989	18	16
1990	19	25.4
1991	15	25.4
1992	17	25.4
1993	14	25.4
1995	33	25.4
1996	42	25.4
1999	38	25.4
2000	56	37.5
2006	19	37.5

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

First to last qualifying date each year at Lake Arrowhead
Year	First date	Last date
1942	1942-05-20	1942-09-22
1943	1943-05-23	1943-10-01
1944	1944-06-07	1944-09-26
1945	1945-06-13	1945-09-13
1946	1946-07-11	1946-09-24
1947	1947-05-03	1947-09-24
1948	1948-07-01	1948-09-15
1949	1949-06-11	1949-09-23
1950	1950-06-28	1950-10-13
1951	1951-05-25	1951-09-21
1952	1952-08-01	1952-09-17
1953	1953-06-24	1953-09-14
1954	1954-06-20	1954-09-20
1955	1955-06-08	1955-09-11
1956	1956-06-27	1956-09-10
1957	1957-06-03	1957-09-07
1958	1958-06-25	1958-09-01
1959	1959-06-19	1959-09-09
1960	1960-06-01	1960-09-26
1961	1961-06-13	1961-07-28
1962	1962-06-25	1962-09-19
1963	1963-07-14	1963-09-29
1964	1964-06-24	1964-10-04
1965	1965-08-06	1965-10-07
1966	1966-06-14	1966-09-23
1967	1967-05-21	1967-08-30
1968	1968-05-27	1968-09-10
1969	1969-06-30	1969-09-10
1970	1970-06-01	1970-09-10
1971	1971-07-11	1971-09-16
1972	1972-06-28	1972-08-22
1973	1973-05-30	1973-09-07
1974	1974-05-25	1974-07-28
1975	1975-07-07	1975-09-05
1976	1976-06-25	1976-09-01
1977	1977-07-15	1977-09-08
1978	1978-06-07	1978-08-29
1979	1979-06-05	1979-09-14
1981	1981-06-05	1981-08-30
1982	1982-07-20	1982-09-23
1983	1983-07-11	1983-09-14
1984	1984-05-28	1984-09-14
1986	1986-06-23	1986-09-05
1987	1987-07-14	1987-10-03
1988	1988-06-27	1988-09-06
1989	1989-04-05	1989-09-06
1990	1990-06-20	1990-09-13
1991	1991-07-01	1991-09-04
1992	1992-07-18	1992-08-21
1993	1993-06-24	1993-09-11
1995	1995-06-24	1995-09-16
1996	1996-05-11	1996-09-01
1999	1999-06-13	1999-10-01
2000	2000-05-21	2000-09-17
2006	2006-06-21	2006-07-24

Every Fixed Threshold

Fixed thresholds at Lake Arrowhead
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	55	56	2000	19
35 C (95 F): Days	17	8	2000	8
40 C (104 F): Days	1	1	2000	1
90 F (32.2 C): Days	48	26	2000	4
100 F (37.8 C): Days	3	2	2000	2
0 C (32 F): Ice days (max	47	11	1971	7
0 C (32 F): Frost days (min	57	142	1975	110
-10 C (14 F): Days with min	38	23	1949	1
20 C (68 F): Tropical nights (min	22	4	1947	1
25 C (77 F): Days with min	1	1	1947	1
10 mm (0.39 in): Days with 10 mm or more rain	59	41	1983	9
25 mm (0.98 in): Days with 25 mm or more rain	59	26	1978	9
50 mm (1.97 in): Days with 50 mm or more rain	58	17	1978	7
100 mm (3.94 in): Days with 100 mm or more rain	43	7	1969	4
200 mm (7.87 in): Days with 200 mm or more rain	6	4	1969	1
10 cm (3.9 in): Days with 10 cm or more snowfall	50	17	1952	3
25 cm (9.8 in): Days with 25 cm or more snowfall	33	8	1952	2
50 cm (19.7 in): Days with 50 cm or more snowfall	9	3	1952	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1942.

Download the Data

Data for Lake Arrowhead 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).

Lake Arrowhead Threshold Days by Year

Key Facts for Lake Arrowhead Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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