Princeton A Threshold Days by Year (CA001126510)

16 fixed thresholds counted per year at Princeton A (CA001126510): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Princeton A Thresholds

Princeton A: nights with a minimum temperature at or below 0 C (32 F) in 47 years, most in 1942 with 216.
Princeton A: nights with a minimum temperature at or below -10 C (14 F) in 47 years, most in 1951 with 72.
Princeton A: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1955 with 14.
Princeton A: days with a maximum temperature at or above 30 C (86 F) in 46 years, most in 1958 with 53.
16 fixed thresholds have at least one qualifying day at Princeton A.

Days at or above 30 C (86 F)

46 years with a qualifying day

Days per year at Princeton A with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 53 in 1958.

Days at or above 30 C (86 F) per year at Princeton A
Year	Days	Decade average
1938	35	36.5
1939	38	36.5
1940	34	25
1941	30	25
1942	35	25
1943	21	25
1944	24	25
1945	30	25
1946	24	25
1947	17	25
1948	15	25
1949	20	25
1950	23	21.4
1951	21	21.4
1952	30	21.4
1953	17	21.4
1954	4	21.4
1955	22	21.4
1956	21	21.4
1957	8	21.4
1958	53	21.4
1959	15	21.4
1960	30	25.4
1961	45	25.4
1962	14	25.4
1963	16	25.4
1964	8	25.4
1965	22	25.4
1966	16	25.4
1967	44	25.4
1968	20	25.4
1969	39	25.4
1970	44	27.6
1971	39	27.6
1972	25	27.6
1973	38	27.6
1974	27	27.6
1975	20	27.6
1976	10	27.6
1977	29	27.6
1978	23	27.6
1979	21	27.6
1980	12	17
1981	25	17
1982	16	17
1983	15	17

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

First to last qualifying date each year at Princeton A
Year	First date	Last date
1938	1938-06-19	1938-09-17
1939	1939-04-29	1939-09-22
1940	1940-05-22	1940-09-12
1941	1941-05-23	1941-08-22
1942	1942-06-29	1942-09-23
1943	1943-06-29	1943-09-12
1944	1944-05-27	1944-09-12
1945	1945-06-24	1945-09-14
1946	1946-06-19	1946-09-02
1947	1947-05-06	1947-09-22
1948	1948-05-26	1948-09-13
1949	1949-05-11	1949-09-01
1950	1950-06-28	1950-09-21
1951	1951-05-22	1951-09-17
1952	1952-07-03	1952-09-25
1953	1953-07-05	1953-09-11
1954	1954-07-14	1954-08-01
1955	1955-06-09	1955-09-06
1956	1956-05-30	1956-09-18
1957	1957-05-31	1957-09-24
1958	1958-05-18	1958-09-07
1959	1959-06-19	1959-09-12
1960	1960-06-28	1960-09-12
1961	1961-06-01	1961-08-28
1962	1962-06-23	1962-09-05
1963	1963-06-15	1963-09-09
1964	1964-07-01	1964-08-11
1965	1965-06-10	1965-08-19
1966	1966-05-05	1966-09-22
1967	1967-06-15	1967-09-28
1968	1968-06-25	1968-09-09
1969	1969-05-23	1969-09-12
1970	1970-06-01	1970-08-31
1971	1971-07-14	1971-08-30
1972	1972-05-28	1972-08-29
1973	1973-05-13	1973-09-11
1974	1974-06-12	1974-09-25
1975	1975-06-01	1975-09-14
1976	1976-06-28	1976-09-01
1977	1977-04-24	1977-08-20
1978	1978-06-02	1978-08-09
1979	1979-06-26	1979-09-18
1980	1980-07-08	1980-10-06
1981	1981-07-03	1981-09-18
1982	1982-06-12	1982-08-25
1983	1983-05-27	1983-08-31

Every Fixed Threshold

Fixed thresholds at Princeton A
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	46	53	1958	15
35 C (95 F): Days	35	15	1971	2
40 C (104 F): Days	2	2	1941	2
90 F (32.2 C): Days	46	30	1958	7
100 F (37.8 C): Days	9	3	1941	1
0 C (32 F): Ice days (max	46	105	1955	47
0 C (32 F): Frost days (min	47	216	1942	176
-10 C (14 F): Days with min	47	72	1951	26
-20 C (-4 F): Days with min	46	27	1950	9
-30 C (-22 F): Days with min	27	11	1950	4
-40 C (-40 F): Days with min	2	2	1968	2
10 mm (0.39 in): Days with 10 mm or more rain	47	14	1955	12
25 mm (0.98 in): Days with 25 mm or more rain	19	2	1947	2
10 cm (3.9 in): Days with 10 cm or more snowfall	44	9	1955	3
25 cm (9.8 in): Days with 25 cm or more snowfall	14	2	1949	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	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 1938.

Download the Data

Data for Princeton A 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).

Princeton A Threshold Days by Year (CA001126510)

Key Facts for Princeton A Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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