Palomar Mtn Obsy Threshold Days by Year (USC00046657)

17 fixed thresholds counted per year at Palomar Mtn Obsy (USC00046657): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Palomar Mtn Obsy Thresholds

Palomar Mtn Obsy: days with 10 mm (0.39 in) or more of precipitation in 80 years, most in 1978 with 38.
Palomar Mtn Obsy: days with 25 mm (0.98 in) or more of precipitation in 80 years, most in 1978 with 26.
Palomar Mtn Obsy: days with 50 mm (1.97 in) or more of precipitation in 74 years, most in 2023 with 12.
Palomar Mtn Obsy: nights with a minimum temperature at or below 0 C (32 F) in 69 years, most in 1973 with 112.
17 fixed thresholds have at least one qualifying day at Palomar Mtn Obsy.

Days at or above 30 C (86 F)

68 years with a qualifying day

Days per year at Palomar Mtn Obsy with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 72 in 1970.

Days at or above 30 C (86 F) per year at Palomar Mtn Obsy
Year	Days	Decade average
1940	20	28.9
1943	27	28.9
1944	33	28.9
1945	36	28.9
1946	18	28.9
1947	35	28.9
1949	33	28.9
1950	36	31
1951	47	31
1952	26	31
1953	40	31
1954	21	31
1955	27	31
1956	21	31
1957	25	31
1958	36	31
1962	19	39
1963	30	39
1967	35	39
1968	50	39
1969	61	39
1970	72	46.3
1971	65	46.3
1972	50	46.3
1973	57	46.3
1974	51	46.3
1975	31	46.3
1976	20	46.3
1977	29	46.3
1978	43	46.3
1979	45	46.3
1981	66	34.1
1982	39	34.1
1983	14	34.1
1984	30	34.1
1985	33	34.1
1986	41	34.1
1987	27	34.1
1988	23	34.1
1989	34	34.1
1990	39	27.9
1991	13	27.9
1992	7	27.9
1993	17	27.9
1994	43	27.9
1995	36	27.9
1996	47	27.9
1997	30	27.9
1998	25	27.9
1999	22	27.9
2000	45	47.7
2001	40	47.7
2002	58	47.7
2010	18	30.9
2011	25	30.9
2012	25	30.9
2013	36	30.9
2014	25	30.9
2015	35	30.9
2016	42	30.9
2017	41	30.9
2018	37	30.9
2019	25	30.9
2022	50	41
2023	29	41
2024	56	41
2025	32	41
2026	38	41

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

First to last qualifying date each year at Palomar Mtn Obsy
Year	First date	Last date
1940	1940-06-13	1940-09-01
1943	1943-07-10	1943-09-23
1944	1944-06-29	1944-09-25
1945	1945-06-18	1945-09-15
1946	1946-07-31	1946-09-25
1947	1947-05-03	1947-09-27
1949	1949-06-14	1949-09-24
1950	1950-06-28	1950-10-14
1951	1951-05-26	1951-10-10
1952	1952-07-04	1952-09-17
1953	1953-06-22	1953-09-25
1954	1954-06-19	1954-09-21
1955	1955-06-07	1955-09-14
1956	1956-06-28	1956-09-27
1957	1957-06-23	1957-09-08
1958	1958-06-25	1958-10-18
1962	1962-08-11	1962-09-20
1963	1963-07-13	1963-09-30
1967	1967-05-21	1967-08-31
1968	1968-05-28	1968-09-28
1969	1969-05-30	1969-09-30
1970	1970-05-16	1970-09-19
1971	1971-07-08	1971-10-14
1972	1972-06-28	1972-10-01
1973	1973-05-30	1973-09-08
1974	1974-05-26	1974-09-11
1975	1975-07-08	1975-09-06
1976	1976-06-25	1976-09-02
1977	1977-06-24	1977-09-09
1978	1978-06-08	1978-10-14
1979	1979-06-07	1979-09-26
1981	1981-06-04	1981-09-07
1982	1982-07-14	1982-09-27
1983	1983-05-29	1983-09-16
1984	1984-05-29	1984-09-07
1985	1985-06-08	1985-09-01
1986	1986-06-14	1986-09-07
1987	1987-06-04	1987-10-06
1988	1988-07-01	1988-09-07
1989	1989-05-06	1989-09-06
1990	1990-06-05	1990-09-15
1991	1991-07-02	1991-08-25
1992	1992-08-11	1992-08-20
1993	1993-06-26	1993-09-12
1994	1994-06-11	1994-09-06
1995	1995-06-25	1995-09-15
1996	1996-05-12	1996-10-09
1997	1997-05-12	1997-09-11
1998	1998-07-12	1998-08-31
1999	1999-06-13	1999-08-29
2000	2000-05-22	2000-09-20
2001	2001-05-23	2001-09-29
2002	2002-05-30	2002-09-24
2010	2010-07-09	2010-09-27
2011	2011-06-22	2011-10-13
2012	2012-06-20	2012-10-02
2013	2013-06-01	2013-09-15
2014	2014-06-08	2014-09-15
2015	2015-06-14	2015-09-26
2016	2016-06-04	2016-08-31
2017	2017-06-16	2017-09-02
2018	2018-06-04	2018-09-09
2019	2019-07-12	2019-09-14
2022	2022-06-09	2022-09-27
2023	2023-06-30	2023-08-30
2024	2024-06-15	2024-10-07
2025	2025-06-10	2025-09-01
2026	2026-07-07	2026-08-29

Every Fixed Threshold

Fixed thresholds at Palomar Mtn Obsy
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	68	72	1970	38
35 C (95 F): Days	27	27	1972	5
90 F (32.2 C): Days	67	45	1970	20
100 F (37.8 C): Days	3	4	1972	4
0 C (32 F): Ice days (max	50	23	1949	6
0 C (32 F): Frost days (min	69	112	1973	10
-10 C (14 F): Days with min	17	5	1971	4
20 C (68 F): Tropical nights (min	69	49	2024	34
25 C (77 F): Days with min	7	1	1940	1
10 mm (0.39 in): Days with 10 mm or more rain	80	38	1978	10
25 mm (0.98 in): Days with 25 mm or more rain	80	26	1978	4
50 mm (1.97 in): Days with 50 mm or more rain	74	12	2023	1
100 mm (3.94 in): Days with 100 mm or more rain	32	4	1969	1
200 mm (7.87 in): Days with 200 mm or more rain	7	1	1969	1
10 cm (3.9 in): Days with 10 cm or more snowfall	57	12	1952	2
25 cm (9.8 in): Days with 25 cm or more snowfall	34	5	1949	1
50 cm (19.7 in): Days with 50 cm or more snowfall	3	1	1949	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1940.

Download the Data

Data for Palomar Mtn Obsy 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).

Palomar Mtn Obsy Threshold Days by Year (USC00046657)

Key Facts for Palomar Mtn Obsy Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related